Component

Strontium

Strontium interacts with calcium-sensitive transport, signaling and mineral chemistry. Stable strontium, drug formulations and laboratory exposures are distinguished; a response to strontium is not evidence of a nutritional requirement.

56 recorded relationships. Experimental role, claim status and evidence remain attached to each record.

Read recorded mechanisms Open recursive mind map

How nutrients influence it

Every nutrient with a recorded effect on this component, credited to the nutrient that acted rather than the chapter that recorded it. Open a nutrient to see the findings and the conditions they were measured under.

Human evidence only

How nutrients reach it in more than one step

Chains of two or more recorded steps that end here, grouped by the nutrient they start from. Each step is a separate finding, so a chain is a route a mechanism could take, not proof that it does.

Tracing routes…

What it does

Every recorded relationship this component is part of, grouped by its role. Plain wording comes first; the technical statement follows.

Recorded relationships

Where it participates (unsigned role)

In 17 patients with osteoporosis or chronic renal failure, mean six-hour fractional absorption was 20.2% for stable strontium versus 37.8% for calcium, despite correlated time courses.
Strontium ion / Sr2+ → Calcium ion source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Consecutive-day dual-tracer tests with standardized meals; ten osteoporosis and seven renal-failure patients.
limitations
Small selected sample; nonlinear relationship and meal/carrier doses matter. Accessed abstract is explicitly truncated.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Strontium can be a calcium tracer surrogate without behaving identically.
primary_references
Stable strontium absorption as a measure of intestinal calcium absorption: comparison with the double-radiotracer calcium absorption test. · 1994 · https://pubmed.ncbi.nlm.nih.gov/7955914/ · DOI 10.1042/cs0870363
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 46–52
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Consecutive-day dual-tracer tests with standardized meals; ten osteoporosis and seven renal-failure patients. · source_derived_draft · unverified_draft
## strontium-absorption-not-identical Strontium can be a calcium tracer surrogate without behaving identically. In 17 patients with osteoporosis or chronic renal failure, mean six-hour fractional absorption was 20.2% for stable strontium versus 37.8% for calcium, despite correlated time courses. Model: Consecutive-day dual-tracer tests with standardized meals; ten osteoporosis and seven renal-failure patients. Limitations: Small selected sample; nonlinear relationship and meal/carrier doses matter. Accessed abstract is explicitly truncated. Evidence access: Primary abstract Stable strontium absorption as a measure of intestinal calcium absorption: comparison with the double-radiotracer calcium absorption test. · 1994 · https://pubmed.ncbi.nlm.nih.gov/7955914/ · DOI 10.1042/cs0870363
Complete structured claim and evidence
Pharmacological Akt inhibition abolished strontium protection against osteoblast apoptosis in the tested wild-type and Casr-knockout mouse cultures.
Mouse Akt protein family (isoform unresolved) → Strontium-associated survival of mouse osteoblasts source_derived_draftungraded
Experimental context and source evidence
availability_state
machinery_impairment Imported condition classification; unverified.
evidence_access
Primary abstract
experimental_model
Serum deprivation or IL-1beta/TNF-alpha challenge in mouse osteoblasts.
limitations
Pharmacological evidence; Akt isoform unresolved.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
A downstream survival pathway remained necessary even when the receptor was absent.
primary_references
Calcium sensing receptor-dependent and receptor-independent activation of osteoblast replication and survival by strontium ranelate. · 2009 · https://pubmed.ncbi.nlm.nih.gov/20141614/ · DOI 10.1111/j.1582-4934.2009.00673.x
trigger_kind
machinery_impairment Imported condition classification; unverified.
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 102–108
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Serum deprivation or IL-1beta/TNF-alpha challenge in mouse osteoblasts. · source_derived_draft · unverified_draft
## strontium-akt-survival A downstream survival pathway remained necessary even when the receptor was absent. Pharmacological Akt inhibition abolished strontium protection against osteoblast apoptosis in the tested wild-type and Casr-knockout mouse cultures. Model: Serum deprivation or IL-1beta/TNF-alpha challenge in mouse osteoblasts. Limitations: Pharmacological evidence; Akt isoform unresolved. Evidence access: Primary abstract Calcium sensing receptor-dependent and receptor-independent activation of osteoblast replication and survival by strontium ranelate. · 2009 · https://pubmed.ncbi.nlm.nih.gov/20141614/ · DOI 10.1111/j.1582-4934.2009.00673.x
Complete structured claim and evidence
Across 34 iliac biopsies after 2–60 months of ranelate treatment, secondary mineralization remained at a normal level while the bone area containing strontium increased.
Strontium ranelate → Degree of mineralization in human ranelate-treatment biopsies source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Human iliac-bone microradiography and microanalysis.
limitations
Related clinical research program; not independent randomized proof of every cellular mechanism or absence of all adverse effects.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
A human biopsy series did not reproduce generalized mineralization failure.
primary_references
Distribution of strontium and mineralization in iliac bone biopsies from osteoporotic women treated long-term with strontium ranelate. · 2011 · https://pubmed.ncbi.nlm.nih.gov/21690207/ · DOI 10.1530/EJE-11-0415
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 302–308
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Human iliac-bone microradiography and microanalysis. · source_derived_draft · unverified_draft
## strontium-biopsy-mineralization A human biopsy series did not reproduce generalized mineralization failure. Across 34 iliac biopsies after 2–60 months of ranelate treatment, secondary mineralization remained at a normal level while the bone area containing strontium increased. Model: Human iliac-bone microradiography and microanalysis. Limitations: Related clinical research program; not independent randomized proof of every cellular mechanism or absence of all adverse effects. Evidence access: Primary abstract Distribution of strontium and mineralization in iliac bone biopsies from osteoporotic women treated long-term with strontium ranelate. · 2011 · https://pubmed.ncbi.nlm.nih.gov/21690207/ · DOI 10.1530/EJE-11-0415
Complete structured claim and evidence
Biopsies from ranelate-treated osteoporotic women localized strontium mainly to bone structural units formed during treatment, with old units reported devoid of strontium in the analyzed samples.
Strontium ranelate → Strontium deposition in newly formed human bone source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Human treatment biopsies; X-ray microanalysis and cartography, up to three years for these analyses.
limitations
Sampled iliac bone does not define uptake or release kinetics for the entire skeleton.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Bone turnover determines where the element is incorporated.
primary_references
In osteoporotic women treated with strontium ranelate, strontium is located in bone formed during treatment with a maintained degree of mineralization. · 2010 · https://pubmed.ncbi.nlm.nih.gov/19597910/ · DOI 10.1007/s00198-009-1005-z
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 294–300
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Human treatment biopsies; X-ray microanalysis and cartography, up to three years for these analyses. · source_derived_draft · unverified_draft
## strontium-bone-localization Bone turnover determines where the element is incorporated. Biopsies from ranelate-treated osteoporotic women localized strontium mainly to bone structural units formed during treatment, with old units reported devoid of strontium in the analyzed samples. Model: Human treatment biopsies; X-ray microanalysis and cartography, up to three years for these analyses. Limitations: Sampled iliac bone does not define uptake or release kinetics for the entire skeleton. Evidence access: Primary abstract In osteoporotic women treated with strontium ranelate, strontium is located in bone formed during treatment with a maintained degree of mineralization. · 2010 · https://pubmed.ncbi.nlm.nih.gov/19597910/ · DOI 10.1007/s00198-009-1005-z
Complete structured claim and evidence
AC-265347 and BTU-compound 13 potentiated calcium/strontium CaSR signaling in HEK293 cells but neither replicated nor potentiated strontium inhibition of human osteoclast function.
AC-265347 and BTU-compound 13 CaSR modulators → Maturation, TRAP activity and resorption in human osteoclast cultures source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Paired receptor and human osteoclast experiments; cinacalcet behaved differently.
limitations
Distinct ligand and cell contexts; no claim that CaSR alone fully explains osteoclast effects.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
A stronger receptor assay signal did not guarantee the same cell-level outcome.
primary_references
Divergent effects of strontium and calcium-sensing receptor positive allosteric modulators (calcimimetics) on human osteoclast activity. · 2018 · https://pubmed.ncbi.nlm.nih.gov/29714810/ · DOI 10.1111/bph.14344
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 262–268
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Paired receptor and human osteoclast experiments; cinacalcet behaved differently. · source_derived_draft · unverified_draft
## strontium-calcimimetic-dissociation A stronger receptor assay signal did not guarantee the same cell-level outcome. AC-265347 and BTU-compound 13 potentiated calcium/strontium CaSR signaling in HEK293 cells but neither replicated nor potentiated strontium inhibition of human osteoclast function. Model: Paired receptor and human osteoclast experiments; cinacalcet behaved differently. Limitations: Distinct ligand and cell contexts; no claim that CaSR alone fully explains osteoclast effects. Evidence access: Primary abstract Divergent effects of strontium and calcium-sensing receptor positive allosteric modulators (calcimimetics) on human osteoclast activity. · 2018 · https://pubmed.ncbi.nlm.nih.gov/29714810/ · DOI 10.1111/bph.14344
Complete structured claim and evidence
Cyclosporin A or FK506 blocked ranelate-associated NFATc1 activation and blunted osteoblast replication and phenotypic gene expression.
Mouse calcineurin phosphatase complex → Mouse NFATc1 source_derived_draftungraded
Experimental context and source evidence
availability_state
machinery_impairment Imported condition classification; unverified.
evidence_access
Primary abstract
experimental_model
Murine osteoblast inhibitor experiments.
limitations
These inhibitors have broader biological effects; not a clinical interaction estimate.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
perturbation_agent
inhibits · Cyclosporine A / ciclosporin A Cyclosporin A or FK506 blocked ranelate-associated NFATc1 activation; the experiment used cyclosporin A as the calcineurin blocker. FK506 is the second agent and is not a ledger entity yet.
plain_language
Blocking the activating phosphatase interrupts the downstream response.
primary_references
Essential role of nuclear factor of activated T cells (NFAT)-mediated Wnt signaling in osteoblast differentiation induced by strontium ranelate. · 2010 · https://pubmed.ncbi.nlm.nih.gov/20554534/ · DOI 10.1074/jbc.M110.110502
trigger_kind
machinery_impairment Imported condition classification; unverified.
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 126–132
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Murine osteoblast inhibitor experiments. · source_derived_draft · unverified_draft
## strontium-calcineurin-block Blocking the activating phosphatase interrupts the downstream response. Cyclosporin A or FK506 blocked ranelate-associated NFATc1 activation and blunted osteoblast replication and phenotypic gene expression. Model: Murine osteoblast inhibitor experiments. Limitations: These inhibitors have broader biological effects; not a clinical interaction estimate. Evidence access: Primary abstract Essential role of nuclear factor of activated T cells (NFAT)-mediated Wnt signaling in osteoblast differentiation induced by strontium ranelate. · 2010 · https://pubmed.ncbi.nlm.nih.gov/20554534/ · DOI 10.1074/jbc.M110.110502
Complete structured claim and evidence
Strontium stimulated calcitonin secretion with higher potency than calcium in the rat 6-23 cell study despite differing signaling bias.
Strontium ion / Sr2+ → Calcitonin secretion by rat thyroid 6-23 cells source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Rat medullary thyroid carcinoma cell concentration-response assays.
limitations
Calcitonin is not T3/T4, and this does not establish the net human calcium response.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
A calcium-like ion can affect a hormone involved in calcium regulation.
primary_references
Strontium is a biased agonist of the calcium-sensing receptor in rat medullary thyroid carcinoma 6-23 cells. · 2012 · https://pubmed.ncbi.nlm.nih.gov/22942242/ · DOI 10.1124/jpet.112.197210
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 350–356
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Rat medullary thyroid carcinoma cell concentration-response assays. · source_derived_draft · unverified_draft
## strontium-calcitonin-secretion A calcium-like ion can affect a hormone involved in calcium regulation. Strontium stimulated calcitonin secretion with higher potency than calcium in the rat 6-23 cell study despite differing signaling bias. Model: Rat medullary thyroid carcinoma cell concentration-response assays. Limitations: Calcitonin is not T3/T4, and this does not establish the net human calcium response. Evidence access: Primary abstract Strontium is a biased agonist of the calcium-sensing receptor in rat medullary thyroid carcinoma 6-23 cells. · 2012 · https://pubmed.ncbi.nlm.nih.gov/22942242/ · DOI 10.1124/jpet.112.197210
Complete structured claim and evidence
In four renal-failure patients retested after calcitriol 1 microgram/day for ten days, six-hour strontium absorption increased 4.29-fold and calcium absorption 2.4-fold.
Calcitriol → Human intestinal strontium absorption source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Small before/after subgroup within the dual-tracer study.
limitations
Four patients, active hormone and renal impairment; not a universal effect of vitamin D3 supplementation.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Active vitamin D changed the two absorption responses by different amounts.
primary_references
Stable strontium absorption as a measure of intestinal calcium absorption: comparison with the double-radiotracer calcium absorption test. · 1994 · https://pubmed.ncbi.nlm.nih.gov/7955914/ · DOI 10.1042/cs0870363
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 54–60
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Small before/after subgroup within the dual-tracer study. · source_derived_draft · unverified_draft
## strontium-calcitriol-absorption Active vitamin D changed the two absorption responses by different amounts. In four renal-failure patients retested after calcitriol 1 microgram/day for ten days, six-hour strontium absorption increased 4.29-fold and calcium absorption 2.4-fold. Model: Small before/after subgroup within the dual-tracer study. Limitations: Four patients, active hormone and renal impairment; not a universal effect of vitamin D3 supplementation. Evidence access: Primary abstract Stable strontium absorption as a measure of intestinal calcium absorption: comparison with the double-radiotracer calcium absorption test. · 1994 · https://pubmed.ncbi.nlm.nih.gov/7955914/ · DOI 10.1042/cs0870363
Complete structured claim and evidence
Combining extracellular strontium and calcium produced greater apoptosis of mature rabbit osteoclasts than either ion alone.
Strontium ion / Sr2+ → Apoptosis of mature rabbit osteoclasts source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Primary rabbit osteoclast combination experiment.
limitations
Greater combined effect is not proof of clinical synergy, an optimal ratio or a supplement recommendation.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
A measured interaction between the two ions is preserved as its own finding.
primary_references
The calcium-sensing receptor is involved in strontium ranelate-induced osteoclast apoptosis. New insights into the associated signaling pathways. · 2009 · https://pubmed.ncbi.nlm.nih.gov/18927086/ · DOI 10.1074/jbc.M801668200
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 238–244
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Primary rabbit osteoclast combination experiment. · source_derived_draft · unverified_draft
## strontium-calcium-combination A measured interaction between the two ions is preserved as its own finding. Combining extracellular strontium and calcium produced greater apoptosis of mature rabbit osteoclasts than either ion alone. Model: Primary rabbit osteoclast combination experiment. Limitations: Greater combined effect is not proof of clinical synergy, an optimal ratio or a supplement recommendation. Evidence access: Primary abstract The calcium-sensing receptor is involved in strontium ranelate-induced osteoclast apoptosis. New insights into the associated signaling pathways. · 2009 · https://pubmed.ncbi.nlm.nih.gov/18927086/ · DOI 10.1074/jbc.M801668200
Complete structured claim and evidence
Cardiovascular-death odds were higher for current ranelate versus current bisphosphonate use, OR 1.35 (1.02–1.80), but lower for current versus past ranelate use, OR 0.68 (0.48–0.96).
Strontium ranelate → Cardiovascular death in ranelate observational cohorts source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Same healthcare-database study.
limitations
Authors discuss treatment cessation near end of life and residual confounding; this is not a demonstrated biological reversal or a draft conflict.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Changing the comparison changed the association.
primary_references
Comparative cardiovascular safety of strontium ranelate and bisphosphonates: a multi-database study in 5 EU countries by the EU-ADR Alliance. · 2020 · https://pubmed.ncbi.nlm.nih.gov/32757044/ · DOI 10.1007/s00198-020-05580-0
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 454–460
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Same healthcare-database study. · source_derived_draft · unverified_draft
## strontium-cardiovascular-death Changing the comparison changed the association. Cardiovascular-death odds were higher for current ranelate versus current bisphosphonate use, OR 1.35 (1.02–1.80), but lower for current versus past ranelate use, OR 0.68 (0.48–0.96). Model: Same healthcare-database study. Limitations: Authors discuss treatment cessation near end of life and residual confounding; this is not a demonstrated biological reversal or a draft conflict. Evidence access: Primary abstract Comparative cardiovascular safety of strontium ranelate and bisphosphonates: a multi-database study in 5 EU countries by the EU-ADR Alliance. · 2020 · https://pubmed.ncbi.nlm.nih.gov/32757044/ · DOI 10.1007/s00198-020-05580-0
Complete structured claim and evidence
In a five-country study restricted to patients without ranelate contraindications, current ranelate versus current bisphosphonate use had an acute-MI odds ratio of 0.89, 95% CI 0.70–1.12.
Strontium ranelate → Acute myocardial infarction in ranelate observational cohorts source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Nested case-control studies in healthcare databases.
limitations
Selected eligible patients and residual confounding; not proof of cardiovascular safety or a vascular mechanism.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
This observational comparison did not detect excess myocardial infarction.
primary_references
Comparative cardiovascular safety of strontium ranelate and bisphosphonates: a multi-database study in 5 EU countries by the EU-ADR Alliance. · 2020 · https://pubmed.ncbi.nlm.nih.gov/32757044/ · DOI 10.1007/s00198-020-05580-0
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 438–444
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Nested case-control studies in healthcare databases. · source_derived_draft · unverified_draft
## strontium-cardiovascular-null-ami This observational comparison did not detect excess myocardial infarction. In a five-country study restricted to patients without ranelate contraindications, current ranelate versus current bisphosphonate use had an acute-MI odds ratio of 0.89, 95% CI 0.70–1.12. Model: Nested case-control studies in healthcare databases. Limitations: Selected eligible patients and residual confounding; not proof of cardiovascular safety or a vascular mechanism. Evidence access: Primary abstract Comparative cardiovascular safety of strontium ranelate and bisphosphonates: a multi-database study in 5 EU countries by the EU-ADR Alliance. · 2020 · https://pubmed.ncbi.nlm.nih.gov/32757044/ · DOI 10.1007/s00198-020-05580-0
Complete structured claim and evidence
Strontium increased replication in both wild-type and Casr-knockout mouse osteoblasts despite loss of the rapid ERK response in knockout cells.
Strontium ion / Sr2+ → Replication of Casr-knockout mouse osteoblasts source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract and accessible full-text Methods
experimental_model
Same primary mouse-cell study and defined SrCl2/ranelate mixture.
limitations
Does not identify the alternative sensor or establish universal CaSR independence.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Losing one receptor branch did not remove every growth response.
primary_references
Calcium sensing receptor-dependent and receptor-independent activation of osteoblast replication and survival by strontium ranelate. · 2009 · https://pubmed.ncbi.nlm.nih.gov/20141614/ · DOI 10.1111/j.1582-4934.2009.00673.x
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 94–100
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Same primary mouse-cell study and defined SrCl2/ranelate mixture. · source_derived_draft · unverified_draft
## strontium-casr-independent-growth Losing one receptor branch did not remove every growth response. Strontium increased replication in both wild-type and Casr-knockout mouse osteoblasts despite loss of the rapid ERK response in knockout cells. Model: Same primary mouse-cell study and defined SrCl2/ranelate mixture. Limitations: Does not identify the alternative sensor or establish universal CaSR independence. Evidence access: Primary abstract and accessible full-text Methods Calcium sensing receptor-dependent and receptor-independent activation of osteoblast replication and survival by strontium ranelate. · 2009 · https://pubmed.ncbi.nlm.nih.gov/20141614/ · DOI 10.1111/j.1582-4934.2009.00673.x
Complete structured claim and evidence
The reported Casr knockout abolished rapid strontium-associated ERK1/2 phosphorylation in primary mouse osteoblasts.
Mouse calcium-sensing receptor / Casr → Rapid ERK phosphorylation after strontium in mouse osteoblasts source_derived_draftungraded
Experimental context and source evidence
availability_state
machinery_impairment Imported condition classification; unverified.
evidence_access
Primary full text, publicly accessible Methods and results
experimental_model
Mouse calvarial cells; exon-4-disrupted Casr model; SrCl2/sodium-ranelate mixture at 100:1, expressed as Sr2+ concentration.
limitations
Genotype and assay-specific finding; other response branches persisted.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
One signaling branch requires the receptor in this model.
primary_references
Calcium sensing receptor-dependent and receptor-independent activation of osteoblast replication and survival by strontium ranelate. · 2009 · https://pubmed.ncbi.nlm.nih.gov/20141614/ · DOI 10.1111/j.1582-4934.2009.00673.x
trigger_kind
machinery_impairment Imported condition classification; unverified.
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 86–92
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Mouse calvarial cells; exon-4-disrupted Casr model; SrCl2/sodium-ranelate mixture at 100:1, expressed as Sr2+ concentration. · source_derived_draft · unverified_draft
## strontium-casr-knockout-erk One signaling branch requires the receptor in this model. The reported Casr knockout abolished rapid strontium-associated ERK1/2 phosphorylation in primary mouse osteoblasts. Model: Mouse calvarial cells; exon-4-disrupted Casr model; SrCl2/sodium-ranelate mixture at 100:1, expressed as Sr2+ concentration. Limitations: Genotype and assay-specific finding; other response branches persisted. Evidence access: Primary full text, publicly accessible Methods and results Calcium sensing receptor-dependent and receptor-independent activation of osteoblast replication and survival by strontium ranelate. · 2009 · https://pubmed.ncbi.nlm.nih.gov/20141614/ · DOI 10.1111/j.1582-4934.2009.00673.x
Complete structured claim and evidence
Selective COX-2 inhibition abolished the proliferative and anti-apoptotic strontium responses in wild-type and Casr-knockout osteoblasts.
Mouse cyclooxygenase-2 / Ptgs2 → Growth and survival responses to strontium in mouse osteoblasts source_derived_draftungraded
Experimental context and source evidence
availability_state
machinery_impairment Imported condition classification; unverified.
evidence_access
Primary abstract
experimental_model
Mouse bone-cell inhibitor experiments; the paper also reports PGE2 production.
limitations
Not proof that dietary arachidonic acid or a COX-2 drug changes fracture benefit in humans.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Prostaglandin-producing machinery links the response to lipid signaling.
primary_references
Calcium sensing receptor-dependent and receptor-independent activation of osteoblast replication and survival by strontium ranelate. · 2009 · https://pubmed.ncbi.nlm.nih.gov/20141614/ · DOI 10.1111/j.1582-4934.2009.00673.x
trigger_kind
machinery_impairment Imported condition classification; unverified.
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 110–116
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Mouse bone-cell inhibitor experiments; the paper also reports PGE2 production. · source_derived_draft · unverified_draft
## strontium-cox2-dependence Prostaglandin-producing machinery links the response to lipid signaling. Selective COX-2 inhibition abolished the proliferative and anti-apoptotic strontium responses in wild-type and Casr-knockout osteoblasts. Model: Mouse bone-cell inhibitor experiments; the paper also reports PGE2 production. Limitations: Not proof that dietary arachidonic acid or a COX-2 drug changes fracture benefit in humans. Evidence access: Primary abstract Calcium sensing receptor-dependent and receptor-independent activation of osteoblast replication and survival by strontium ranelate. · 2009 · https://pubmed.ncbi.nlm.nih.gov/20141614/ · DOI 10.1111/j.1582-4934.2009.00673.x
Complete structured claim and evidence
Theoretical attenuation calculations predicted strontium overestimation factors around 9–10.8 for the tested DXA systems, with different factors for single-energy CT.
Strontium ion / Sr2+ → Strontium-associated DXA bone-density overestimation source_derived_draftungraded
Experimental context and source evidence
availability_state
biomarker_context Imported condition classification; unverified.
evidence_access
Primary abstract
experimental_model
Physical modeling using X-ray attenuation coefficients.
limitations
Historical device calculations, not universal current scanner calibration; bone retention also matters after treatment stops.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
The size of the measurement effect depends partly on the method.
primary_references
Effect of bone strontium on BMD measurements. · 2007 · https://pubmed.ncbi.nlm.nih.gov/17289524/ · DOI 10.1016/j.jocd.2006.10.004
trigger_kind
biomarker_context Imported condition classification; unverified.
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 318–324
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Physical modeling using X-ray attenuation coefficients. · source_derived_draft · unverified_draft
## strontium-dxa-device-dependence The size of the measurement effect depends partly on the method. Theoretical attenuation calculations predicted strontium overestimation factors around 9–10.8 for the tested DXA systems, with different factors for single-energy CT. Model: Physical modeling using X-ray attenuation coefficients. Limitations: Historical device calculations, not universal current scanner calibration; bone retention also matters after treatment stops. Evidence access: Primary abstract Effect of bone strontium on BMD measurements. · 2007 · https://pubmed.ncbi.nlm.nih.gov/17289524/ · DOI 10.1016/j.jocd.2006.10.004
Complete structured claim and evidence
In calcium/strontium hydroxyapatite mixtures, approximately 1 mol% strontium caused about 10% overestimation of DXA bone mineral density/content across the tested instruments.
Strontium ion / Sr2+ → Strontium-associated DXA bone-density overestimation source_derived_draftungraded
Experimental context and source evidence
availability_state
biomarker_context Imported condition classification; unverified.
evidence_access
Primary abstract
experimental_model
Physical phantom experiments with 0–3.5 mol% strontium.
limitations
Mixture calibration is not a patient-specific correction; bone strontium content at the scanned site is required.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Strontium can make a scan read denser without an equivalent increase in calcium mineral.
primary_references
Influence of strontium on bone mineral density and bone mineral content measurements by dual X-ray absorptiometry. · 1999 · https://pubmed.ncbi.nlm.nih.gov/10677790/ · DOI 10.1016/s1094-6950(06)60402-2
trigger_kind
biomarker_context Imported condition classification; unverified.
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 310–316
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Physical phantom experiments with 0–3.5 mol% strontium. · source_derived_draft · unverified_draft
## strontium-dxa-physics Strontium can make a scan read denser without an equivalent increase in calcium mineral. In calcium/strontium hydroxyapatite mixtures, approximately 1 mol% strontium caused about 10% overestimation of DXA bone mineral density/content across the tested instruments. Model: Physical phantom experiments with 0–3.5 mol% strontium. Limitations: Mixture calibration is not a patient-specific correction; bone strontium content at the scanned site is required. Evidence access: Primary abstract Influence of strontium on bone mineral density and bone mineral content measurements by dual X-ray absorptiometry. · 1999 · https://pubmed.ncbi.nlm.nih.gov/10677790/ · DOI 10.1016/s1094-6950(06)60402-2
Complete structured claim and evidence
An Akt-dependent signaling cascade through CaSR promoted beta-catenin nuclear translocation in strontium-treated primary human osteoblasts.
Strontium ion / Sr2+ → Human beta-catenin / CTNNB1 source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Human primary osteoblast signaling experiments.
limitations
Does not prove direct binding to Akt or beta-catenin; Akt isoform not resolved here.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
A receptor signal can reach a transcriptional regulator through Akt.
primary_references
An Akt-dependent increase in canonical Wnt signaling and a decrease in sclerostin protein levels are involved in strontium ranelate-induced osteogenic effects in human osteoblasts. · 2011 · https://pubmed.ncbi.nlm.nih.gov/21566129/ · DOI 10.1074/jbc.M111.251116
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 182–188
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Human primary osteoblast signaling experiments. · source_derived_draft · unverified_draft
## strontium-human-beta-catenin A receptor signal can reach a transcriptional regulator through Akt. An Akt-dependent signaling cascade through CaSR promoted beta-catenin nuclear translocation in strontium-treated primary human osteoblasts. Model: Human primary osteoblast signaling experiments. Limitations: Does not prove direct binding to Akt or beta-catenin; Akt isoform not resolved here. Evidence access: Primary abstract An Akt-dependent increase in canonical Wnt signaling and a decrease in sclerostin protein levels are involved in strontium ranelate-induced osteogenic effects in human osteoblasts. · 2011 · https://pubmed.ncbi.nlm.nih.gov/21566129/ · DOI 10.1074/jbc.M111.251116
Complete structured claim and evidence
Strontium chloride and the ranelate preparation stimulated ERK phosphorylation in HEK293 cells transfected with human CaSR.
Strontium ion / Sr2+ → Calcium-sensing receptor / CaSR source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Human receptor transfection and dose-response signaling assays.
limitations
Receptor signaling is not itself proof of stronger bone or a nutritional requirement.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Strontium can engage a receptor normally used to sense extracellular calcium.
primary_references
The Calcium-sensing Receptor (CaR) is involved in strontium ranelate-induced osteoblast differentiation and mineralization. · 2010 · https://pubmed.ncbi.nlm.nih.gov/20560105/ · DOI 10.1055/s-0030-1255091
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 70–76
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Human receptor transfection and dose-response signaling assays. · source_derived_draft · unverified_draft
## strontium-human-casr Strontium can engage a receptor normally used to sense extracellular calcium. Strontium chloride and the ranelate preparation stimulated ERK phosphorylation in HEK293 cells transfected with human CaSR. Model: Human receptor transfection and dose-response signaling assays. Limitations: Receptor signaling is not itself proof of stronger bone or a nutritional requirement. Evidence access: Primary abstract The Calcium-sensing Receptor (CaR) is involved in strontium ranelate-induced osteoblast differentiation and mineralization. · 2010 · https://pubmed.ncbi.nlm.nih.gov/20560105/ · DOI 10.1055/s-0030-1255091
Complete structured claim and evidence
At 10 mM, strontium did not produce calcium oscillations or activation in the tested human oocytes, although TRPV3 expression and responses to TRPV3 agonists were detected.
Strontium ion / Sr2+ → Human oocyte activation after strontium exposure source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary full text
experimental_model
Small human oocyte study, largely in-vitro matured material, with mouse comparisons.
limitations
Limited fresh in-vivo-matured human oocytes and no human knockout; channel presence is not proof of strontium permeability.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
The mouse result did not transfer to these human eggs.
primary_references
Strontium fails to induce Ca2+ release and activation in human oocytes despite the presence of functional TRPV3 channels. · 2018 · https://pubmed.ncbi.nlm.nih.gov/30895246/ · DOI 10.1093/hropen/hoy005
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 398–404
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Small human oocyte study, largely in-vitro matured material, with mouse comparisons. · source_derived_draft · unverified_draft
## strontium-human-egg-null The mouse result did not transfer to these human eggs. At 10 mM, strontium did not produce calcium oscillations or activation in the tested human oocytes, although TRPV3 expression and responses to TRPV3 agonists were detected. Model: Small human oocyte study, largely in-vitro matured material, with mouse comparisons. Limitations: Limited fresh in-vivo-matured human oocytes and no human knockout; channel presence is not proof of strontium permeability. Evidence access: Primary full text Strontium fails to induce Ca2+ release and activation in human oocytes despite the presence of functional TRPV3 channels. · 2018 · https://pubmed.ncbi.nlm.nih.gov/30895246/ · DOI 10.1093/hropen/hoy005
Complete structured claim and evidence
Strontium ranelate induced an osteocyte-like phenotype, increased DMP1 and sclerostin mRNA and markedly increased mineralization at reported concentrations of 5 mM or greater.
Strontium ranelate → Osteocyte-like phenotype in strontium-treated human cultures source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Long-term adult human primary osteoblast cultures.
limitations
High culture concentration; SOST transcript increase is not a direct contradiction of a different study measuring sclerostin protein.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Cell maturity and exposure can change which markers rise.
primary_references
Strontium ranelate treatment of human primary osteoblasts promotes an osteocyte-like phenotype while eliciting an osteoprotegerin response. · 2009 · https://pubmed.ncbi.nlm.nih.gov/18763010/ · DOI 10.1007/s00198-008-0728-6
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 206–212
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Long-term adult human primary osteoblast cultures. · source_derived_draft · unverified_draft
## strontium-human-maturation Cell maturity and exposure can change which markers rise. Strontium ranelate induced an osteocyte-like phenotype, increased DMP1 and sclerostin mRNA and markedly increased mineralization at reported concentrations of 5 mM or greater. Model: Long-term adult human primary osteoblast cultures. Limitations: High culture concentration; SOST transcript increase is not a direct contradiction of a different study measuring sclerostin protein. Evidence access: Primary abstract Strontium ranelate treatment of human primary osteoblasts promotes an osteocyte-like phenotype while eliciting an osteoprotegerin response. · 2009 · https://pubmed.ncbi.nlm.nih.gov/18763010/ · DOI 10.1007/s00198-008-0728-6
Complete structured claim and evidence
Strontium increased mineralization in primary human osteoblast cultures in the 2011 study.
Strontium ion / Sr2+ → Mineralization in strontium-treated human osteoblast cultures source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Primary human osteoblast mineralization assay.
limitations
Later rat primary-culture work directly challenged a general mineralization-promoting interpretation; matched exposure and culture comparisons remain necessary.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
This study found more mineral deposition in its culture system.
primary_references
An Akt-dependent increase in canonical Wnt signaling and a decrease in sclerostin protein levels are involved in strontium ranelate-induced osteogenic effects in human osteoblasts. · 2011 · https://pubmed.ncbi.nlm.nih.gov/21566129/ · DOI 10.1074/jbc.M111.251116
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 190–196
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Primary human osteoblast mineralization assay. · source_derived_draft · unverified_draft
## strontium-human-mineralization-positive This study found more mineral deposition in its culture system. Strontium increased mineralization in primary human osteoblast cultures in the 2011 study. Model: Primary human osteoblast mineralization assay. Limitations: Later rat primary-culture work directly challenged a general mineralization-promoting interpretation; matched exposure and culture comparisons remain necessary. Evidence access: Primary abstract An Akt-dependent increase in canonical Wnt signaling and a decrease in sclerostin protein levels are involved in strontium ranelate-induced osteogenic effects in human osteoblasts. · 2011 · https://pubmed.ncbi.nlm.nih.gov/21566129/ · DOI 10.1074/jbc.M111.251116
Complete structured claim and evidence
In long-term adult human primary osteoblast cultures, strontium ranelate increased the OPG/RANKL ratio and an OPG secretory response.
Strontium ranelate → Osteoprotegerin / TNFRSF11B / OPG source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Human culture, OPG ELISA and gene-expression assays.
limitations
Ratio change is not itself a direct measurement of osteoclast resorption.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Bone-forming cells can change the signals reaching bone-resorbing cells.
primary_references
Strontium ranelate treatment of human primary osteoblasts promotes an osteocyte-like phenotype while eliciting an osteoprotegerin response. · 2009 · https://pubmed.ncbi.nlm.nih.gov/18763010/ · DOI 10.1007/s00198-008-0728-6
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 198–204
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Human culture, OPG ELISA and gene-expression assays. · source_derived_draft · unverified_draft
## strontium-human-opg Bone-forming cells can change the signals reaching bone-resorbing cells. In long-term adult human primary osteoblast cultures, strontium ranelate increased the OPG/RANKL ratio and an OPG secretory response. Model: Human culture, OPG ELISA and gene-expression assays. Limitations: Ratio change is not itself a direct measurement of osteoclast resorption. Evidence access: Primary abstract Strontium ranelate treatment of human primary osteoblasts promotes an osteocyte-like phenotype while eliciting an osteoprotegerin response. · 2009 · https://pubmed.ncbi.nlm.nih.gov/18763010/ · DOI 10.1007/s00198-008-0728-6
Complete structured claim and evidence
Strontium inhibited maturation, TRAP expression and hydroxyapatite resorption in human blood-derived osteoclast cultures.
Strontium ion / Sr2+ → Maturation, TRAP activity and resorption in human osteoclast cultures source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Human blood-derived osteoclast assays paired with HEK293 receptor signaling.
limitations
Cell-culture effects do not independently establish fracture reduction.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
The human-cell study measured function as well as a marker.
primary_references
Divergent effects of strontium and calcium-sensing receptor positive allosteric modulators (calcimimetics) on human osteoclast activity. · 2018 · https://pubmed.ncbi.nlm.nih.gov/29714810/ · DOI 10.1111/bph.14344
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 254–260
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Human blood-derived osteoclast assays paired with HEK293 receptor signaling. · source_derived_draft · unverified_draft
## strontium-human-osteoclast The human-cell study measured function as well as a marker. Strontium inhibited maturation, TRAP expression and hydroxyapatite resorption in human blood-derived osteoclast cultures. Model: Human blood-derived osteoclast assays paired with HEK293 receptor signaling. Limitations: Cell-culture effects do not independently establish fracture reduction. Evidence access: Primary abstract Divergent effects of strontium and calcium-sensing receptor positive allosteric modulators (calcimimetics) on human osteoclast activity. · 2018 · https://pubmed.ncbi.nlm.nih.gov/29714810/ · DOI 10.1111/bph.14344
Complete structured claim and evidence
Strontium exposure decreased sclerostin protein expression in primary human osteoblast cultures in the 2011 study.
Strontium ion / Sr2+ → Human sclerostin / SOST source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Human primary osteoblast culture.
limitations
Separate from the Akt branch; an earlier long-term culture report found increased SOST mRNA with an osteocyte-like phenotype. Protein, RNA, stage and time are not interchangeable.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Removing a Wnt inhibitor can favor a bone-cell response.
primary_references
An Akt-dependent increase in canonical Wnt signaling and a decrease in sclerostin protein levels are involved in strontium ranelate-induced osteogenic effects in human osteoblasts. · 2011 · https://pubmed.ncbi.nlm.nih.gov/21566129/ · DOI 10.1074/jbc.M111.251116
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 174–180
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Human primary osteoblast culture. · source_derived_draft · unverified_draft
## strontium-human-sclerostin Removing a Wnt inhibitor can favor a bone-cell response. Strontium exposure decreased sclerostin protein expression in primary human osteoblast cultures in the 2011 study. Model: Human primary osteoblast culture. Limitations: Separate from the Akt branch; an earlier long-term culture report found increased SOST mRNA with an osteocyte-like phenotype. Protein, RNA, stage and time are not interchangeable. Evidence access: Primary abstract An Akt-dependent increase in canonical Wnt signaling and a decrease in sclerostin protein levels are involved in strontium ranelate-induced osteogenic effects in human osteoblasts. · 2011 · https://pubmed.ncbi.nlm.nih.gov/21566129/ · DOI 10.1074/jbc.M111.251116
Complete structured claim and evidence
Strontium-supported keratinocyte cultures lacked the stratification and desmosomes found with 1.8 mM calcium, despite increased cell yield.
Strontium chloride → Terminal differentiation and desmosomes in human keratinocytes source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Electron microscopy and morphology in human keratinocyte cultures.
limitations
This does not define whole-body calcium deficiency or a dermatologic therapy.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Supporting cell growth did not replace calcium’s differentiation function.
primary_references
Use of strontium to separate calcium-dependent pathways for proliferation and differentiation in human keratinocytes. · 1987 · https://pubmed.ncbi.nlm.nih.gov/2439523/ · DOI 10.1002/jcp.1041320111
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 414–420
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Electron microscopy and morphology in human keratinocyte cultures. · source_derived_draft · unverified_draft
## strontium-keratinocyte-differentiation Supporting cell growth did not replace calcium’s differentiation function. Strontium-supported keratinocyte cultures lacked the stratification and desmosomes found with 1.8 mM calcium, despite increased cell yield. Model: Electron microscopy and morphology in human keratinocyte cultures. Limitations: This does not define whole-body calcium deficiency or a dermatologic therapy. Evidence access: Primary abstract Use of strontium to separate calcium-dependent pathways for proliferation and differentiation in human keratinocytes. · 1987 · https://pubmed.ncbi.nlm.nih.gov/2439523/ · DOI 10.1002/jcp.1041320111
Complete structured claim and evidence
In human keratinocytes grown in low-calcium serum-free medium, SrCl2 increased seven-day cell yield, with the reported optimum at 1.8 mM.
Strontium chloride → Human keratinocyte yield with strontium source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Human keratinocytes with 0.03 mM basal calcium; dose-response culture study.
limitations
Cell yield is not skin healing or systemic nutritional benefit.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Strontium supported proliferation in a specialized skin-cell culture.
primary_references
Use of strontium to separate calcium-dependent pathways for proliferation and differentiation in human keratinocytes. · 1987 · https://pubmed.ncbi.nlm.nih.gov/2439523/ · DOI 10.1002/jcp.1041320111
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 406–412
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Human keratinocytes with 0.03 mM basal calcium; dose-response culture study. · source_derived_draft · unverified_draft
## strontium-keratinocyte-growth Strontium supported proliferation in a specialized skin-cell culture. In human keratinocytes grown in low-calcium serum-free medium, SrCl2 increased seven-day cell yield, with the reported optimum at 1.8 mM. Model: Human keratinocytes with 0.03 mM basal calcium; dose-response culture study. Limitations: Cell yield is not skin healing or systemic nutritional benefit. Evidence access: Primary abstract Use of strontium to separate calcium-dependent pathways for proliferation and differentiation in human keratinocytes. · 1987 · https://pubmed.ncbi.nlm.nih.gov/2439523/ · DOI 10.1002/jcp.1041320111
Complete structured claim and evidence
Strontium strongly inhibited mineral deposition while collagenous matrix structures remained apparent and osteoblast numbers were unchanged; ionized calcium remained in the medium.
Strontium ion / Sr2+ → Mineralization in strontium-treated rat calvarial osteoblast cultures source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary full text
experimental_model
Same rat primary osteoblast cultures.
limitations
Does not establish that all bone effects are physicochemical, nor deny fracture outcomes in a clinical trial.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Making a scaffold and depositing calcium mineral are different steps.
primary_references
Strontium potently inhibits mineralisation in bone-forming primary rat osteoblast cultures and reduces numbers of osteoclasts in mouse marrow cultures. · 2014 · https://pubmed.ncbi.nlm.nih.gov/25048011/ · DOI 10.1007/s00198-014-2791-5
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AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Same rat primary osteoblast cultures. · source_derived_draft · unverified_draft
## strontium-matrix-versus-mineral Making a scaffold and depositing calcium mineral are different steps. Strontium strongly inhibited mineral deposition while collagenous matrix structures remained apparent and osteoblast numbers were unchanged; ionized calcium remained in the medium. Model: Same rat primary osteoblast cultures. Limitations: Does not establish that all bone effects are physicochemical, nor deny fracture outcomes in a clinical trial. Evidence access: Primary full text Strontium potently inhibits mineralisation in bone-forming primary rat osteoblast cultures and reduces numbers of osteoclasts in mouse marrow cultures. · 2014 · https://pubmed.ncbi.nlm.nih.gov/25048011/ · DOI 10.1007/s00198-014-2791-5
Complete structured claim and evidence
Pretreatment with NPS2390 largely antagonized ranelate-associated proliferation and mineralization in mouse MC3T3-E1 cells.
Mouse calcium-sensing receptor / Casr → Strontium-associated MC3T3-E1 proliferation and mineralization source_derived_draftungraded
Experimental context and source evidence
availability_state
machinery_impairment Imported condition classification; unverified.
evidence_access
Primary abstract
experimental_model
Mouse osteoblast-line pharmacological experiment.
limitations
NPS2390 is not a receptor-specific genetic deletion; later knockout experiments retain some responses.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
A receptor inhibitor reduced the response in this culture model.
primary_references
The Calcium-sensing Receptor (CaR) is involved in strontium ranelate-induced osteoblast differentiation and mineralization. · 2010 · https://pubmed.ncbi.nlm.nih.gov/20560105/ · DOI 10.1055/s-0030-1255091
trigger_kind
machinery_impairment Imported condition classification; unverified.
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 78–84
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Mouse osteoblast-line pharmacological experiment. · source_derived_draft · unverified_draft
## strontium-mouse-casr-block A receptor inhibitor reduced the response in this culture model. Pretreatment with NPS2390 largely antagonized ranelate-associated proliferation and mineralization in mouse MC3T3-E1 cells. Model: Mouse osteoblast-line pharmacological experiment. Limitations: NPS2390 is not a receptor-specific genetic deletion; later knockout experiments retain some responses. Evidence access: Primary abstract The Calcium-sensing Receptor (CaR) is involved in strontium ranelate-induced osteoblast differentiation and mineralization. · 2010 · https://pubmed.ncbi.nlm.nih.gov/20560105/ · DOI 10.1055/s-0030-1255091
Complete structured claim and evidence
TRPV3 mediated strontium influx into mouse eggs in the reported channel and activation experiments.
Mouse TRPV3 → Strontium ion / Sr2+ source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary full text
experimental_model
Mouse egg electrophysiology and genetic experiments.
limitations
Laboratory artificial activation; no claim about dietary strontium or human fertility.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
A calcium-permeable channel can also admit strontium in mouse eggs.
primary_references
TRPV3 channels mediate strontium-induced mouse-egg activation. · 2013 · https://pubmed.ncbi.nlm.nih.gov/24316078/ · DOI 10.1016/j.celrep.2013.11.007
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AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Mouse egg electrophysiology and genetic experiments. · source_derived_draft · unverified_draft
## strontium-mouse-egg-entry A calcium-permeable channel can also admit strontium in mouse eggs. TRPV3 mediated strontium influx into mouse eggs in the reported channel and activation experiments. Model: Mouse egg electrophysiology and genetic experiments. Limitations: Laboratory artificial activation; no claim about dietary strontium or human fertility. Evidence access: Primary full text TRPV3 channels mediate strontium-induced mouse-egg activation. · 2013 · https://pubmed.ncbi.nlm.nih.gov/24316078/ · DOI 10.1016/j.celrep.2013.11.007
Complete structured claim and evidence
Strontium ranelate disrupted the actin-containing sealing zone of mouse osteoclasts and reduced resorbing activity.
Strontium ranelate → Actin-containing sealing zone in mouse osteoclasts source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Primary murine spleen-derived osteoclast culture.
limitations
Distinct from merely reducing osteoclast numbers; experimental concentration limits apply.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Changing the attachment structure can impair bone resorption.
primary_references
Dual effect of strontium ranelate: stimulation of osteoblast differentiation and inhibition of osteoclast formation and resorption in vitro. · 2008 · https://pubmed.ncbi.nlm.nih.gov/17945546/ · DOI 10.1016/j.bone.2007.08.043
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AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Primary murine spleen-derived osteoclast culture. · source_derived_draft · unverified_draft
## strontium-mouse-sealing-zone Changing the attachment structure can impair bone resorption. Strontium ranelate disrupted the actin-containing sealing zone of mouse osteoclasts and reduced resorbing activity. Model: Primary murine spleen-derived osteoclast culture. Limitations: Distinct from merely reducing osteoclast numbers; experimental concentration limits apply. Evidence access: Primary abstract Dual effect of strontium ranelate: stimulation of osteoblast differentiation and inhibition of osteoclast formation and resorption in vitro. · 2008 · https://pubmed.ncbi.nlm.nih.gov/17945546/ · DOI 10.1016/j.bone.2007.08.043
Complete structured claim and evidence
Trpv3-knockout mouse eggs failed to conduct Sr2+ or undergo strontium-induced activation.
Mouse TRPV3 → Strontium-induced mouse egg activation source_derived_draftungraded
Experimental context and source evidence
availability_state
machinery_impairment Imported condition classification; unverified.
evidence_access
Primary full text
experimental_model
Mouse Trpv3 genetic knockout.
limitations
Does not establish that channel expression alone is sufficient in other species.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Removing the channel removes the experimental response.
primary_references
TRPV3 channels mediate strontium-induced mouse-egg activation. · 2013 · https://pubmed.ncbi.nlm.nih.gov/24316078/ · DOI 10.1016/j.celrep.2013.11.007
trigger_kind
machinery_impairment Imported condition classification; unverified.
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AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Mouse Trpv3 genetic knockout. · source_derived_draft · unverified_draft
## strontium-mouse-trpv3-loss Removing the channel removes the experimental response. Trpv3-knockout mouse eggs failed to conduct Sr2+ or undergo strontium-induced activation. Model: Mouse Trpv3 genetic knockout. Limitations: Does not establish that channel expression alone is sufficient in other species. Evidence access: Primary full text TRPV3 channels mediate strontium-induced mouse-egg activation. · 2013 · https://pubmed.ncbi.nlm.nih.gov/24316078/ · DOI 10.1016/j.celrep.2013.11.007
Complete structured claim and evidence
The strontium-ranelate study found NFATc1 nuclear translocation and increased transcriptional activity in murine MC3T3-E1 and primary osteoblasts.
Strontium ranelate → Mouse NFATc1 source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Murine osteoblast nuclear-localization and reporter assays.
limitations
Cell-culture preparation and model; not direct human target engagement.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
A calcium-responsive transcription factor connects exposure to gene regulation.
primary_references
Essential role of nuclear factor of activated T cells (NFAT)-mediated Wnt signaling in osteoblast differentiation induced by strontium ranelate. · 2010 · https://pubmed.ncbi.nlm.nih.gov/20554534/ · DOI 10.1074/jbc.M110.110502
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 118–124
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Murine osteoblast nuclear-localization and reporter assays. · source_derived_draft · unverified_draft
## strontium-nfat-activation A calcium-responsive transcription factor connects exposure to gene regulation. The strontium-ranelate study found NFATc1 nuclear translocation and increased transcriptional activity in murine MC3T3-E1 and primary osteoblasts. Model: Murine osteoblast nuclear-localization and reporter assays. Limitations: Cell-culture preparation and model; not direct human target engagement. Evidence access: Primary abstract Essential role of nuclear factor of activated T cells (NFAT)-mediated Wnt signaling in osteoblast differentiation induced by strontium ranelate. · 2010 · https://pubmed.ncbi.nlm.nih.gov/20554534/ · DOI 10.1074/jbc.M110.110502
Complete structured claim and evidence
Strontium salts reduced osteoclast formation and total resorption pits in mouse marrow cultures; the study attributed much of the lower total resorption to fewer osteoclasts.
Strontium ion / Sr2+ → Osteoclast numbers in strontium-treated mouse marrow culture source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary full text
experimental_model
Eight-day mouse marrow cultures on dentine with M-CSF and RANKL.
limitations
Different assay from the murine sealing-zone study; total versus per-cell measures should not be collapsed.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Total resorption can fall because there are fewer cells, not necessarily because each cell works less.
primary_references
Strontium potently inhibits mineralisation in bone-forming primary rat osteoblast cultures and reduces numbers of osteoclasts in mouse marrow cultures. · 2014 · https://pubmed.ncbi.nlm.nih.gov/25048011/ · DOI 10.1007/s00198-014-2791-5
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 286–292
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Eight-day mouse marrow cultures on dentine with M-CSF and RANKL. · source_derived_draft · unverified_draft
## strontium-osteoclast-number-versus-function Total resorption can fall because there are fewer cells, not necessarily because each cell works less. Strontium salts reduced osteoclast formation and total resorption pits in mouse marrow cultures; the study attributed much of the lower total resorption to fewer osteoclasts. Model: Eight-day mouse marrow cultures on dentine with M-CSF and RANKL. Limitations: Different assay from the murine sealing-zone study; total versus per-cell measures should not be collapsed. Evidence access: Primary full text Strontium potently inhibits mineralisation in bone-forming primary rat osteoblast cultures and reduces numbers of osteoclasts in mouse marrow cultures. · 2014 · https://pubmed.ncbi.nlm.nih.gov/25048011/ · DOI 10.1007/s00198-014-2791-5
Complete structured claim and evidence
Strontium dose-dependently induced apoptosis of primary mature rabbit osteoclasts through a CaSR-linked pathway.
Strontium ion / Sr2+ → Apoptosis of mature rabbit osteoclasts source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Primary mature rabbit osteoclast study.
limitations
Species and high experimental exposures limit translation to human dietary intake.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
In this model, the ion can promote death of bone-resorbing cells.
primary_references
The calcium-sensing receptor is involved in strontium ranelate-induced osteoclast apoptosis. New insights into the associated signaling pathways. · 2009 · https://pubmed.ncbi.nlm.nih.gov/18927086/ · DOI 10.1074/jbc.M801668200
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 214–220
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Primary mature rabbit osteoclast study. · source_derived_draft · unverified_draft
## strontium-rabbit-apoptosis In this model, the ion can promote death of bone-resorbing cells. Strontium dose-dependently induced apoptosis of primary mature rabbit osteoclasts through a CaSR-linked pathway. Model: Primary mature rabbit osteoclast study. Limitations: Species and high experimental exposures limit translation to human dietary intake. Evidence access: Primary abstract The calcium-sensing receptor is involved in strontium ranelate-induced osteoclast apoptosis. New insights into the associated signaling pathways. · 2009 · https://pubmed.ncbi.nlm.nih.gov/18927086/ · DOI 10.1074/jbc.M801668200
Complete structured claim and evidence
Unlike calcium in the same experimental program, strontium-associated osteoclast apoptosis was independent of inositol 1,4,5-trisphosphate action.
Strontium ion / Sr2+ → Apoptosis of mature rabbit osteoclasts source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Rabbit osteoclast pathway perturbations.
limitations
Absence of IP3 dependence here is not absence of calcium signaling in every strontium response.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Similar ions need not use identical intracellular messengers.
primary_references
The calcium-sensing receptor is involved in strontium ranelate-induced osteoclast apoptosis. New insights into the associated signaling pathways. · 2009 · https://pubmed.ncbi.nlm.nih.gov/18927086/ · DOI 10.1074/jbc.M801668200
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 230–236
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Rabbit osteoclast pathway perturbations. · source_derived_draft · unverified_draft
## strontium-rabbit-ip3-difference Similar ions need not use identical intracellular messengers. Unlike calcium in the same experimental program, strontium-associated osteoclast apoptosis was independent of inositol 1,4,5-trisphosphate action. Model: Rabbit osteoclast pathway perturbations. Limitations: Absence of IP3 dependence here is not absence of calcium signaling in every strontium response. Evidence access: Primary abstract The calcium-sensing receptor is involved in strontium ranelate-induced osteoclast apoptosis. New insights into the associated signaling pathways. · 2009 · https://pubmed.ncbi.nlm.nih.gov/18927086/ · DOI 10.1074/jbc.M801668200
Complete structured claim and evidence
Strontium-induced rabbit osteoclast apoptosis required PLC-dependent signaling and PKC beta II activation, with nuclear NF-kappaB translocation.
Strontium ion / Sr2+ → Rabbit protein kinase C beta II source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Rabbit mature-osteoclast signaling and inhibitor experiments.
limitations
Accessed abstract does not resolve PLC or NF-kappaB subunits; do not assign human proteins.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
The shared calcium sensor can use a distinct downstream pathway.
primary_references
The calcium-sensing receptor is involved in strontium ranelate-induced osteoclast apoptosis. New insights into the associated signaling pathways. · 2009 · https://pubmed.ncbi.nlm.nih.gov/18927086/ · DOI 10.1074/jbc.M801668200
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 222–228
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Rabbit mature-osteoclast signaling and inhibitor experiments. · source_derived_draft · unverified_draft
## strontium-rabbit-plc-pkc The shared calcium sensor can use a distinct downstream pathway. Strontium-induced rabbit osteoclast apoptosis required PLC-dependent signaling and PKC beta II activation, with nuclear NF-kappaB translocation. Model: Rabbit mature-osteoclast signaling and inhibitor experiments. Limitations: Accessed abstract does not resolve PLC or NF-kappaB subunits; do not assign human proteins. Evidence access: Primary abstract The calcium-sensing receptor is involved in strontium ranelate-induced osteoclast apoptosis. New insights into the associated signaling pathways. · 2009 · https://pubmed.ncbi.nlm.nih.gov/18927086/ · DOI 10.1074/jbc.M801668200
Complete structured claim and evidence
Continuous strontium ranelate at 0.01, 0.1 and 1 mM caused 59%, 98% and 100% inhibition of mineralization in 14-day rat calvarial osteoblast cultures; strontium chloride also strongly inhibited it.
Strontium ranelate → Mineralization in strontium-treated rat calvarial osteoblast cultures source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary full text
experimental_model
Primary rat osteoblast cultures; quantified mineralized nodules.
limitations
Full-text results clarify these numbers are percent inhibition, despite ambiguous abstract wording. Species, culture conditions and soluble exposure require matched comparison.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
This study found less mineral deposition, directly challenging a general stimulatory claim.
primary_references
Strontium potently inhibits mineralisation in bone-forming primary rat osteoblast cultures and reduces numbers of osteoclasts in mouse marrow cultures. · 2014 · https://pubmed.ncbi.nlm.nih.gov/25048011/ · DOI 10.1007/s00198-014-2791-5
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 270–276
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Primary rat osteoblast cultures; quantified mineralized nodules. · source_derived_draft · unverified_draft
## strontium-rat-mineralization-negative This study found less mineral deposition, directly challenging a general stimulatory claim. Continuous strontium ranelate at 0.01, 0.1 and 1 mM caused 59%, 98% and 100% inhibition of mineralization in 14-day rat calvarial osteoblast cultures; strontium chloride also strongly inhibited it. Model: Primary rat osteoblast cultures; quantified mineralized nodules. Limitations: Full-text results clarify these numbers are percent inhibition, despite ambiguous abstract wording. Species, culture conditions and soluble exposure require matched comparison. Evidence access: Primary full text Strontium potently inhibits mineralisation in bone-forming primary rat osteoblast cultures and reduces numbers of osteoclasts in mouse marrow cultures. · 2014 · https://pubmed.ncbi.nlm.nih.gov/25048011/ · DOI 10.1007/s00198-014-2791-5
Complete structured claim and evidence
The reported uptake half-saturation concentrations were about 13.4 micromolar for Sr2+ and 0.28 micromolar for Ca2+, consistent with lower affinity for strontium.
Renal proximal-tubule basolateral calcium/magnesium ATPase assay preparation → Strontium ion / Sr2+ source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary full text
experimental_model
Renal-vesicle uptake kinetics.
limitations
Assay-specific apparent affinities; do not assign them to every calcium channel or human compartment.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Using the same pump does not mean being transported equally efficiently.
primary_references
A Comparison Between Calcium and Strontium Transport by the (Ca2+ + Mg2+)ATPase of the Basolateral Plasma Membrane of Renal Proximal Convoluted Tubules. · 2025 · https://pubmed.ncbi.nlm.nih.gov/40277992/ · DOI 10.3390/membranes15040122
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 30–36
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Renal-vesicle uptake kinetics. · source_derived_draft · unverified_draft
## strontium-renal-affinity Using the same pump does not mean being transported equally efficiently. The reported uptake half-saturation concentrations were about 13.4 micromolar for Sr2+ and 0.28 micromolar for Ca2+, consistent with lower affinity for strontium. Model: Renal-vesicle uptake kinetics. Limitations: Assay-specific apparent affinities; do not assign them to every calcium channel or human compartment. Evidence access: Primary full text A Comparison Between Calcium and Strontium Transport by the (Ca2+ + Mg2+)ATPase of the Basolateral Plasma Membrane of Renal Proximal Convoluted Tubules. · 2025 · https://pubmed.ncbi.nlm.nih.gov/40277992/ · DOI 10.3390/membranes15040122
Complete structured claim and evidence
Omission of ATP or magnesium prevented strontium uptake in the tested renal membrane preparation; other tested nucleotides did not substitute for ATP.
Mg2+ → Strontium uptake by renal membrane vesicles source_derived_draftungraded
Experimental context and source evidence
availability_state
machinery_impairment Imported condition classification; unverified.
evidence_access
Primary full text
experimental_model
Isolated membrane-vesicle cofactor-dependence experiments.
limitations
Cofactor removal is experimental machinery impairment, not proof that dietary magnesium deficiency changes human strontium retention by a specified amount.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
The pump needs both its energy source and magnesium.
primary_references
A Comparison Between Calcium and Strontium Transport by the (Ca2+ + Mg2+)ATPase of the Basolateral Plasma Membrane of Renal Proximal Convoluted Tubules. · 2025 · https://pubmed.ncbi.nlm.nih.gov/40277992/ · DOI 10.3390/membranes15040122
trigger_kind
machinery_impairment Imported condition classification; unverified.
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 38–44
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Isolated membrane-vesicle cofactor-dependence experiments. · source_derived_draft · unverified_draft
## strontium-renal-cofactor-loss The pump needs both its energy source and magnesium. Omission of ATP or magnesium prevented strontium uptake in the tested renal membrane preparation; other tested nucleotides did not substitute for ATP. Model: Isolated membrane-vesicle cofactor-dependence experiments. Limitations: Cofactor removal is experimental machinery impairment, not proof that dietary magnesium deficiency changes human strontium retention by a specified amount. Evidence access: Primary full text A Comparison Between Calcium and Strontium Transport by the (Ca2+ + Mg2+)ATPase of the Basolateral Plasma Membrane of Renal Proximal Convoluted Tubules. · 2025 · https://pubmed.ncbi.nlm.nih.gov/40277992/ · DOI 10.3390/membranes15040122
Complete structured claim and evidence
Calcium and strontium each competitively inhibited uptake of the other in the renal-vesicle assay, increasing apparent half-saturation concentration without changing maximum velocity.
Strontium ion / Sr2+ → Calcium uptake by renal basolateral membrane vesicles source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary full text
experimental_model
Radiotracer uptake in isolated renal basolateral membranes.
limitations
Shared-site kinetics do not establish a dietary calcium-loss threshold or quantify whole-kidney excretion.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
The two ions compete for access to the same transport machinery.
primary_references
A Comparison Between Calcium and Strontium Transport by the (Ca2+ + Mg2+)ATPase of the Basolateral Plasma Membrane of Renal Proximal Convoluted Tubules. · 2025 · https://pubmed.ncbi.nlm.nih.gov/40277992/ · DOI 10.3390/membranes15040122
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 22–28
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Radiotracer uptake in isolated renal basolateral membranes. · source_derived_draft · unverified_draft
## strontium-renal-competition The two ions compete for access to the same transport machinery. Calcium and strontium each competitively inhibited uptake of the other in the renal-vesicle assay, increasing apparent half-saturation concentration without changing maximum velocity. Model: Radiotracer uptake in isolated renal basolateral membranes. Limitations: Shared-site kinetics do not establish a dietary calcium-loss threshold or quantify whole-kidney excretion. Evidence access: Primary full text A Comparison Between Calcium and Strontium Transport by the (Ca2+ + Mg2+)ATPase of the Basolateral Plasma Membrane of Renal Proximal Convoluted Tubules. · 2025 · https://pubmed.ncbi.nlm.nih.gov/40277992/ · DOI 10.3390/membranes15040122
Complete structured claim and evidence
Strontium-loaded drinking water at approximately 200 mg/kg/day caused growth-plate expansion, increased osteoid and reduced bone formation in rats with mild chronic renal failure.
Strontium ion / Sr2+ → Rickets during strontium loading in rats with chronic renal failure source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Growing renal-failure rats; 2, 6 or 12 weeks of loading.
limitations
High animal exposure and disease context; not a human intake threshold or strontium deficiency.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
High exposure with impaired renal function can disrupt growing-bone mineralization.
primary_references
Moderate strontium loading induces rickets in rats with mild chronic renal failure. · 2011 · https://pubmed.ncbi.nlm.nih.gov/21654178/ · DOI 10.1159/000328329
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 326–332
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Growing renal-failure rats; 2, 6 or 12 weeks of loading. · source_derived_draft · unverified_draft
## strontium-renal-loading-rickets High exposure with impaired renal function can disrupt growing-bone mineralization. Strontium-loaded drinking water at approximately 200 mg/kg/day caused growth-plate expansion, increased osteoid and reduced bone formation in rats with mild chronic renal failure. Model: Growing renal-failure rats; 2, 6 or 12 weeks of loading. Limitations: High animal exposure and disease context; not a human intake threshold or strontium deficiency. Evidence access: Primary abstract Moderate strontium loading induces rickets in rats with mild chronic renal failure. · 2011 · https://pubmed.ncbi.nlm.nih.gov/21654178/ · DOI 10.1159/000328329
Complete structured claim and evidence
Growth-plate and osteoid abnormalities associated with strontium loading reversed after washout in the renal-failure rat study.
Strontium washout in renal-failure rats → Rickets during strontium loading in rats with chronic renal failure source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Two- to eight-week washout periods after loading.
limitations
Reversibility in rats does not establish a human treatment protocol.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Removing the exposure reversed the measured injury in this model.
primary_references
Moderate strontium loading induces rickets in rats with mild chronic renal failure. · 2011 · https://pubmed.ncbi.nlm.nih.gov/21654178/ · DOI 10.1159/000328329
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 334–340
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Two- to eight-week washout periods after loading. · source_derived_draft · unverified_draft
## strontium-renal-loading-washout Removing the exposure reversed the measured injury in this model. Growth-plate and osteoid abnormalities associated with strontium loading reversed after washout in the renal-failure rat study. Model: Two- to eight-week washout periods after loading. Limitations: Reversibility in rats does not establish a human treatment protocol. Evidence access: Primary abstract Moderate strontium loading induces rickets in rats with mild chronic renal failure. · 2011 · https://pubmed.ncbi.nlm.nih.gov/21654178/ · DOI 10.1159/000328329
Complete structured claim and evidence
Basolateral proximal-tubule membrane vesicles accumulated radiolabeled strontium in an ATP- and Mg2+-dependent transport assay.
Renal proximal-tubule basolateral calcium/magnesium ATPase assay preparation → Strontium ion / Sr2+ source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary full text
experimental_model
Isolated renal membrane vesicles; 90Sr and 45Ca tracers; ATP/Mg uptake assays.
limitations
Accessed methods refer to a prior preparation protocol without resolving species or ATP2B isoform. The assay measures ion transport, not radiation injury or net human renal clearance.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
A calcium-handling membrane preparation can also pump strontium.
primary_references
A Comparison Between Calcium and Strontium Transport by the (Ca2+ + Mg2+)ATPase of the Basolateral Plasma Membrane of Renal Proximal Convoluted Tubules. · 2025 · https://pubmed.ncbi.nlm.nih.gov/40277992/ · DOI 10.3390/membranes15040122
transport_effect
depends Membrane vesicles accumulated strontium in the assay, while the basolateral pump's role in the intact cell is extrusion toward blood; the two pools move opposite ways.
transport_pool
the proximal-tubule cell interior Membrane vesicles accumulated strontium in the assay, while the basolateral pump's role in the intact cell is extrusion toward blood; the two pools move opposite ways.
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 14–20
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Isolated renal membrane vesicles; 90Sr and 45Ca tracers; ATP/Mg uptake assays. · source_derived_draft · unverified_draft
## strontium-renal-uptake A calcium-handling membrane preparation can also pump strontium. Basolateral proximal-tubule membrane vesicles accumulated radiolabeled strontium in an ATP- and Mg2+-dependent transport assay. Model: Isolated renal membrane vesicles; 90Sr and 45Ca tracers; ATP/Mg uptake assays. Limitations: Accessed methods refer to a prior preparation protocol without resolving species or ATP2B isoform. The assay measures ion transport, not radiation injury or net human renal clearance. Evidence access: Primary full text A Comparison Between Calcium and Strontium Transport by the (Ca2+ + Mg2+)ATPase of the Basolateral Plasma Membrane of Renal Proximal Convoluted Tubules. · 2025 · https://pubmed.ncbi.nlm.nih.gov/40277992/ · DOI 10.3390/membranes15040122
Complete structured claim and evidence
Knocking down RHOA abrogated strontium-ranelate-induced cell proliferation and osteoblast gene expression in the murine study.
Mouse RhoA → Strontium-associated osteoblast gene expression in mouse cells source_derived_draftungraded
Experimental context and source evidence
availability_state
machinery_impairment Imported condition classification; unverified.
evidence_access
Primary abstract
experimental_model
Murine osteoblast knockdown experiments.
limitations
This establishes experimental dependency, not human dietary deficiency.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
A noncanonical Wnt component is another required step in this model.
primary_references
Essential role of nuclear factor of activated T cells (NFAT)-mediated Wnt signaling in osteoblast differentiation induced by strontium ranelate. · 2010 · https://pubmed.ncbi.nlm.nih.gov/20554534/ · DOI 10.1074/jbc.M110.110502
trigger_kind
machinery_impairment Imported condition classification; unverified.
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 166–172
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Murine osteoblast knockdown experiments. · source_derived_draft · unverified_draft
## strontium-rhoa-loss A noncanonical Wnt component is another required step in this model. Knocking down RHOA abrogated strontium-ranelate-induced cell proliferation and osteoblast gene expression in the murine study. Model: Murine osteoblast knockdown experiments. Limitations: This establishes experimental dependency, not human dietary deficiency. Evidence access: Primary abstract Essential role of nuclear factor of activated T cells (NFAT)-mediated Wnt signaling in osteoblast differentiation induced by strontium ranelate. · 2010 · https://pubmed.ncbi.nlm.nih.gov/20554534/ · DOI 10.1074/jbc.M110.110502
Complete structured claim and evidence
Knocking down RYK abrogated strontium-ranelate-induced cell proliferation and osteoblast gene expression in the murine study.
Mouse Ryk → Strontium-associated osteoblast gene expression in mouse cells source_derived_draftungraded
Experimental context and source evidence
availability_state
machinery_impairment Imported condition classification; unverified.
evidence_access
Primary abstract
experimental_model
Murine osteoblast knockdown experiments.
limitations
This establishes experimental dependency, not human dietary deficiency.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
A noncanonical Wnt component is another required step in this model.
primary_references
Essential role of nuclear factor of activated T cells (NFAT)-mediated Wnt signaling in osteoblast differentiation induced by strontium ranelate. · 2010 · https://pubmed.ncbi.nlm.nih.gov/20554534/ · DOI 10.1074/jbc.M110.110502
trigger_kind
machinery_impairment Imported condition classification; unverified.
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 158–164
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Murine osteoblast knockdown experiments. · source_derived_draft · unverified_draft
## strontium-ryk-loss A noncanonical Wnt component is another required step in this model. Knocking down RYK abrogated strontium-ranelate-induced cell proliferation and osteoblast gene expression in the murine study. Model: Murine osteoblast knockdown experiments. Limitations: This establishes experimental dependency, not human dietary deficiency. Evidence access: Primary abstract Essential role of nuclear factor of activated T cells (NFAT)-mediated Wnt signaling in osteoblast differentiation induced by strontium ranelate. · 2010 · https://pubmed.ncbi.nlm.nih.gov/20554534/ · DOI 10.1074/jbc.M110.110502
Complete structured claim and evidence
SOTI reported BMD increases of 14.4% at the lumbar spine and 8.3% at the femoral neck by month 36.
Strontium ranelate → DXA BMD in the SOTI trial source_derived_draftungraded
Experimental context and source evidence
availability_state
biomarker_context Imported condition classification; unverified.
evidence_access
Primary abstract
experimental_model
Same randomized trial; repeated densitometry.
limitations
Do not equate the full BMD increase with new calcium bone mass; independent strontium attenuation studies establish measurement inflation.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
The reported scan changes include a composition-sensitive measurement.
primary_references
The effects of strontium ranelate on the risk of vertebral fracture in women with postmenopausal osteoporosis. · 2004 · https://pubmed.ncbi.nlm.nih.gov/14749454/ · DOI 10.1056/NEJMoa022436
trigger_kind
biomarker_context Imported condition classification; unverified.
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 430–436
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Same randomized trial; repeated densitometry. · source_derived_draft · unverified_draft
## strontium-soti-bmd The reported scan changes include a composition-sensitive measurement. SOTI reported BMD increases of 14.4% at the lumbar spine and 8.3% at the femoral neck by month 36. Model: Same randomized trial; repeated densitometry. Limitations: Do not equate the full BMD increase with new calcium bone mass; independent strontium attenuation studies establish measurement inflation. Evidence access: Primary abstract The effects of strontium ranelate on the risk of vertebral fracture in women with postmenopausal osteoporosis. · 2004 · https://pubmed.ncbi.nlm.nih.gov/14749454/ · DOI 10.1056/NEJMoa022436
Complete structured claim and evidence
In 1,649 postmenopausal women with osteoporosis and a prior vertebral fracture, 2 g/day ranelate reduced new vertebral-fracture risk over three years: relative risk 0.59, 95% CI 0.48–0.73.
Strontium ranelate → New vertebral fractures in the SOTI trial source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Randomized placebo-controlled SOTI trial; both groups received calcium and vitamin D.
limitations
Specific drug, population and co-treatment; no equivalent efficacy established for dietary strontium or strontium citrate. Trial mechanisms are not identified by the fracture endpoint.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
A clinical trial measured fewer fractures, separately from density scans.
primary_references
The effects of strontium ranelate on the risk of vertebral fracture in women with postmenopausal osteoporosis. · 2004 · https://pubmed.ncbi.nlm.nih.gov/14749454/ · DOI 10.1056/NEJMoa022436
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 422–428
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Randomized placebo-controlled SOTI trial; both groups received calcium and vitamin D. · source_derived_draft · unverified_draft
## strontium-soti-fractures A clinical trial measured fewer fractures, separately from density scans. In 1,649 postmenopausal women with osteoporosis and a prior vertebral fracture, 2 g/day ranelate reduced new vertebral-fracture risk over three years: relative risk 0.59, 95% CI 0.48–0.73. Model: Randomized placebo-controlled SOTI trial; both groups received calcium and vitamin D. Limitations: Specific drug, population and co-treatment; no equivalent efficacy established for dietary strontium or strontium citrate. Trial mechanisms are not identified by the fracture endpoint. Evidence access: Primary abstract The effects of strontium ranelate on the risk of vertebral fracture in women with postmenopausal osteoporosis. · 2004 · https://pubmed.ncbi.nlm.nih.gov/14749454/ · DOI 10.1056/NEJMoa022436
Complete structured claim and evidence
In the synaptotagmin-1 domain assays, strontium supported C2B/phospholipid complexes but not C2A/phospholipid complexes, whereas calcium supported both.
Strontium ion / Sr2+ → Synaptotagmin-1 C2B domain in the strontium-binding assay source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Biochemical domain/phospholipid binding accompanying mouse neuronal experiments.
limitations
Accessed abstract does not identify the species of recombinant domain constructs; that identity remains unresolved.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Different domains of a calcium sensor discriminate between the ions.
primary_references
Sr2+ binding to the Ca2+ binding site of the synaptotagmin 1 C2B domain triggers fast exocytosis without stimulating SNARE interactions. · 2003 · https://pubmed.ncbi.nlm.nih.gov/12526776/ · DOI 10.1016/s0896-6273(02)01145-5
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 358–364
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Biochemical domain/phospholipid binding accompanying mouse neuronal experiments. · source_derived_draft · unverified_draft
## strontium-syt-binding Different domains of a calcium sensor discriminate between the ions. In the synaptotagmin-1 domain assays, strontium supported C2B/phospholipid complexes but not C2A/phospholipid complexes, whereas calcium supported both. Model: Biochemical domain/phospholipid binding accompanying mouse neuronal experiments. Limitations: Accessed abstract does not identify the species of recombinant domain constructs; that identity remains unresolved. Evidence access: Primary abstract Sr2+ binding to the Ca2+ binding site of the synaptotagmin 1 C2B domain triggers fast exocytosis without stimulating SNARE interactions. · 2003 · https://pubmed.ncbi.nlm.nih.gov/12526776/ · DOI 10.1016/s0896-6273(02)01145-5
Complete structured claim and evidence
Synaptotagmin-1 knockout selectively impaired the fast component of both calcium- and strontium-induced neurotransmitter release in mouse neurons.
Mouse synaptotagmin 1 / Syt1 → Fast strontium-triggered release at mouse synapses source_derived_draftungraded
Experimental context and source evidence
availability_state
machinery_impairment Imported condition classification; unverified.
evidence_access
Primary abstract
experimental_model
Mouse synaptotagmin-1 knockout synaptic recordings.
limitations
Ion substitution in neuronal experiments is not evidence that oral strontium reaches or improves this pathway.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Fast release needs this sensor even when strontium replaces calcium experimentally.
primary_references
Sr2+ binding to the Ca2+ binding site of the synaptotagmin 1 C2B domain triggers fast exocytosis without stimulating SNARE interactions. · 2003 · https://pubmed.ncbi.nlm.nih.gov/12526776/ · DOI 10.1016/s0896-6273(02)01145-5
trigger_kind
machinery_impairment Imported condition classification; unverified.
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 374–380
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Mouse synaptotagmin-1 knockout synaptic recordings. · source_derived_draft · unverified_draft
## strontium-syt-knockout Fast release needs this sensor even when strontium replaces calcium experimentally. Synaptotagmin-1 knockout selectively impaired the fast component of both calcium- and strontium-induced neurotransmitter release in mouse neurons. Model: Mouse synaptotagmin-1 knockout synaptic recordings. Limitations: Ion substitution in neuronal experiments is not evidence that oral strontium reaches or improves this pathway. Evidence access: Primary abstract Sr2+ binding to the Ca2+ binding site of the synaptotagmin 1 C2B domain triggers fast exocytosis without stimulating SNARE interactions. · 2003 · https://pubmed.ncbi.nlm.nih.gov/12526776/ · DOI 10.1016/s0896-6273(02)01145-5
Complete structured claim and evidence
Unlike calcium, strontium did not stimulate synaptotagmin C2-domain binding to SNARE proteins even at high tested concentrations.
Strontium ion / Sr2+ → Strontium-stimulated synaptotagmin/SNARE binding source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Biochemical protein-binding assays.
limitations
Negative result is specific to the stimulated-binding assay, not absence of SNARE machinery from exocytosis.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Triggering release did not require every interaction induced by calcium.
primary_references
Sr2+ binding to the Ca2+ binding site of the synaptotagmin 1 C2B domain triggers fast exocytosis without stimulating SNARE interactions. · 2003 · https://pubmed.ncbi.nlm.nih.gov/12526776/ · DOI 10.1016/s0896-6273(02)01145-5
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 366–372
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Biochemical protein-binding assays. · source_derived_draft · unverified_draft
## strontium-syt-no-snare-stimulation Triggering release did not require every interaction induced by calcium. Unlike calcium, strontium did not stimulate synaptotagmin C2-domain binding to SNARE proteins even at high tested concentrations. Model: Biochemical protein-binding assays. Limitations: Negative result is specific to the stimulated-binding assay, not absence of SNARE machinery from exocytosis. Evidence access: Primary abstract Sr2+ binding to the Ca2+ binding site of the synaptotagmin 1 C2B domain triggers fast exocytosis without stimulating SNARE interactions. · 2003 · https://pubmed.ncbi.nlm.nih.gov/12526776/ · DOI 10.1016/s0896-6273(02)01145-5
Complete structured claim and evidence
VTE odds ratios were 1.24 (95% CI 0.96–1.61) for current ranelate versus current bisphosphonate use and 1.30 (1.04–1.62) for current versus past ranelate use.
Strontium ranelate → Venous thromboembolism in ranelate observational cohorts source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Same multinational observational database study.
limitations
Association does not establish a coagulation mechanism; do not transfer numerical risks to all salts or doses.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
The VTE signal depended partly on the comparator, and one interval included no increase.
primary_references
Comparative cardiovascular safety of strontium ranelate and bisphosphonates: a multi-database study in 5 EU countries by the EU-ADR Alliance. · 2020 · https://pubmed.ncbi.nlm.nih.gov/32757044/ · DOI 10.1007/s00198-020-05580-0
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 446–452
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Same multinational observational database study. · source_derived_draft · unverified_draft
## strontium-thromboembolism-signal The VTE signal depended partly on the comparator, and one interval included no increase. VTE odds ratios were 1.24 (95% CI 0.96–1.61) for current ranelate versus current bisphosphonate use and 1.30 (1.04–1.62) for current versus past ranelate use. Model: Same multinational observational database study. Limitations: Association does not establish a coagulation mechanism; do not transfer numerical risks to all salts or doses. Evidence access: Primary abstract Comparative cardiovascular safety of strontium ranelate and bisphosphonates: a multi-database study in 5 EU countries by the EU-ADR Alliance. · 2020 · https://pubmed.ncbi.nlm.nih.gov/32757044/ · DOI 10.1007/s00198-020-05580-0
Complete structured claim and evidence
In rat medullary thyroid carcinoma 6-23 cells, strontium biased CaSR signaling toward ERK1/2 relative to Gq/11 and intracellular-calcium mobilization compared with calcium.
Strontium ion / Sr2+ → Rat calcium-sensing receptor / Casr source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Rat C-cell model; concentration-response measurements across six signaling outputs.
limitations
Biased agonism is model- and assay-dependent; not a direct human thyroid-hormone effect.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
The same receptor can send different relative signals depending on the ion.
primary_references
Strontium is a biased agonist of the calcium-sensing receptor in rat medullary thyroid carcinoma 6-23 cells. · 2012 · https://pubmed.ncbi.nlm.nih.gov/22942242/ · DOI 10.1124/jpet.112.197210
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 342–348
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Rat C-cell model; concentration-response measurements across six signaling outputs. · source_derived_draft · unverified_draft
## strontium-thyroid-bias The same receptor can send different relative signals depending on the ion. In rat medullary thyroid carcinoma 6-23 cells, strontium biased CaSR signaling toward ERK1/2 relative to Gq/11 and intracellular-calcium mobilization compared with calcium. Model: Rat C-cell model; concentration-response measurements across six signaling outputs. Limitations: Biased agonism is model- and assay-dependent; not a direct human thyroid-hormone effect. Evidence access: Primary abstract Strontium is a biased agonist of the calcium-sensing receptor in rat medullary thyroid carcinoma 6-23 cells. · 2012 · https://pubmed.ncbi.nlm.nih.gov/22942242/ · DOI 10.1124/jpet.112.197210
Complete structured claim and evidence
Correcting vitamin D deficiency with vitamin D3 did not increase the measured strontium-ranelate absorption in the study of postmenopausal women with low bone mass.
Cholecalciferol → Human intestinal strontium absorption source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
25 women below 50 nmol/L 25(OH)D and 25 above 75 nmol/L; deficient group retested after repletion.
limitations
Mild deficiency, oral overload test and D3 intervention differ from the four-patient calcitriol experiment; not a scientific contradiction or evidence against treating vitamin D deficiency.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Improving vitamin D status did not automatically improve strontium absorption.
primary_references
Vitamin D supplementation and strontium ranelate absorption in postmenopausal women with low bone mass. · 2014 · https://pubmed.ncbi.nlm.nih.gov/24394724/ · DOI 10.1530/EJE-13-0899
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 62–68
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · 25 women below 50 nmol/L 25(OH)D and 25 above 75 nmol/L; deficient group retested after repletion. · source_derived_draft · unverified_draft
## strontium-vitamin-d3-null Improving vitamin D status did not automatically improve strontium absorption. Correcting vitamin D deficiency with vitamin D3 did not increase the measured strontium-ranelate absorption in the study of postmenopausal women with low bone mass. Model: 25 women below 50 nmol/L 25(OH)D and 25 above 75 nmol/L; deficient group retested after repletion. Limitations: Mild deficiency, oral overload test and D3 intervention differ from the four-patient calcitriol experiment; not a scientific contradiction or evidence against treating vitamin D deficiency. Evidence access: Primary abstract Vitamin D supplementation and strontium ranelate absorption in postmenopausal women with low bone mass. · 2014 · https://pubmed.ncbi.nlm.nih.gov/24394724/ · DOI 10.1530/EJE-13-0899
Complete structured claim and evidence
The Wnt antagonists sFRP1 and DKK1 abolished ranelate-induced osteoblast gene expression in the murine cultures.
sFRP1/DKK1 Wnt-antagonist experiments in mouse osteoblasts → Strontium-associated osteoblast gene expression in mouse cells source_derived_draftungraded
Experimental context and source evidence
availability_state
machinery_impairment Imported condition classification; unverified.
evidence_access
Primary abstract
experimental_model
Murine osteoblast Wnt-inhibition experiments.
limitations
The assay does not establish the same degree of dependence for all Wnt ligands or human tissues.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
Interrupting Wnt signaling removed the gene response.
primary_references
Essential role of nuclear factor of activated T cells (NFAT)-mediated Wnt signaling in osteoblast differentiation induced by strontium ranelate. · 2010 · https://pubmed.ncbi.nlm.nih.gov/20554534/ · DOI 10.1074/jbc.M110.110502
trigger_kind
machinery_impairment Imported condition classification; unverified.
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 150–156
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Murine osteoblast Wnt-inhibition experiments. · source_derived_draft · unverified_draft
## strontium-wnt-antagonists Interrupting Wnt signaling removed the gene response. The Wnt antagonists sFRP1 and DKK1 abolished ranelate-induced osteoblast gene expression in the murine cultures. Model: Murine osteoblast Wnt-inhibition experiments. Limitations: The assay does not establish the same degree of dependence for all Wnt ligands or human tissues. Evidence access: Primary abstract Essential role of nuclear factor of activated T cells (NFAT)-mediated Wnt signaling in osteoblast differentiation induced by strontium ranelate. · 2010 · https://pubmed.ncbi.nlm.nih.gov/20554534/ · DOI 10.1074/jbc.M110.110502
Complete structured claim and evidence
Strontium ranelate increased WNT3A expression in the murine osteoblast study; calcineurin inhibitors abolished the increase.
Strontium ranelate → Mouse Wnt3a source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Murine osteoblast gene-expression experiments.
limitations
Expression is not equivalent to ligand delivery in human bone.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
One signaling response changes the production of another signaling protein.
primary_references
Essential role of nuclear factor of activated T cells (NFAT)-mediated Wnt signaling in osteoblast differentiation induced by strontium ranelate. · 2010 · https://pubmed.ncbi.nlm.nih.gov/20554534/ · DOI 10.1074/jbc.M110.110502
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 134–140
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Murine osteoblast gene-expression experiments. · source_derived_draft · unverified_draft
## strontium-wnt3a-expression One signaling response changes the production of another signaling protein. Strontium ranelate increased WNT3A expression in the murine osteoblast study; calcineurin inhibitors abolished the increase. Model: Murine osteoblast gene-expression experiments. Limitations: Expression is not equivalent to ligand delivery in human bone. Evidence access: Primary abstract Essential role of nuclear factor of activated T cells (NFAT)-mediated Wnt signaling in osteoblast differentiation induced by strontium ranelate. · 2010 · https://pubmed.ncbi.nlm.nih.gov/20554534/ · DOI 10.1074/jbc.M110.110502
Complete structured claim and evidence
Strontium ranelate increased WNT5A expression in the murine osteoblast study; calcineurin inhibitors abolished the increase.
Strontium ranelate → Mouse Wnt5a source_derived_draftungraded
Experimental context and source evidence
evidence_access
Primary abstract
experimental_model
Murine osteoblast gene-expression experiments.
limitations
Expression is not equivalent to ligand delivery in human bone.
nutrient_topic
Strontium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Strontium
plain_language
One signaling response changes the production of another signaling protein.
primary_references
Essential role of nuclear factor of activated T cells (NFAT)-mediated Wnt signaling in osteoblast differentiation induced by strontium ranelate. · 2010 · https://pubmed.ncbi.nlm.nih.gov/20554534/ · DOI 10.1074/jbc.M110.110502
Strontium: calcium interactions, cellular mechanisms and mineralization (2026-09-19) · lines 142–148
AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Murine osteoblast gene-expression experiments. · source_derived_draft · unverified_draft
## strontium-wnt5a-expression One signaling response changes the production of another signaling protein. Strontium ranelate increased WNT5A expression in the murine osteoblast study; calcineurin inhibitors abolished the increase. Model: Murine osteoblast gene-expression experiments. Limitations: Expression is not equivalent to ligand delivery in human bone. Evidence access: Primary abstract Essential role of nuclear factor of activated T cells (NFAT)-mediated Wnt signaling in osteoblast differentiation induced by strontium ranelate. · 2010 · https://pubmed.ncbi.nlm.nih.gov/20554534/ · DOI 10.1074/jbc.M110.110502
Complete structured claim and evidence

In the sources

Preserved passages that mention this component, quoted exactly. Open one to read it in context.

This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.

Evidence, AI assistance and curation standards

Strontium

How nutrients influence it

Other things that act on it

How nutrients reach it in more than one step

What it does

Where it participates (unsigned role)

In 17 patients with osteoporosis or chronic renal failure, mean six-hour fractional absorption was 20.2% for stable strontium versus 37.8% for calcium, despite correlated time courses.

Pharmacological Akt inhibition abolished strontium protection against osteoblast apoptosis in the tested wild-type and Casr-knockout mouse cultures.

Across 34 iliac biopsies after 2–60 months of ranelate treatment, secondary mineralization remained at a normal level while the bone area containing strontium increased.

Biopsies from ranelate-treated osteoporotic women localized strontium mainly to bone structural units formed during treatment, with old units reported devoid of strontium in the analyzed samples.

AC-265347 and BTU-compound 13 potentiated calcium/strontium CaSR signaling in HEK293 cells but neither replicated nor potentiated strontium inhibition of human osteoclast function.

Cyclosporin A or FK506 blocked ranelate-associated NFATc1 activation and blunted osteoblast replication and phenotypic gene expression.

Strontium stimulated calcitonin secretion with higher potency than calcium in the rat 6-23 cell study despite differing signaling bias.

In four renal-failure patients retested after calcitriol 1 microgram/day for ten days, six-hour strontium absorption increased 4.29-fold and calcium absorption 2.4-fold.

Combining extracellular strontium and calcium produced greater apoptosis of mature rabbit osteoclasts than either ion alone.

Cardiovascular-death odds were higher for current ranelate versus current bisphosphonate use, OR 1.35 (1.02–1.80), but lower for current versus past ranelate use, OR 0.68 (0.48–0.96).

In a five-country study restricted to patients without ranelate contraindications, current ranelate versus current bisphosphonate use had an acute-MI odds ratio of 0.89, 95% CI 0.70–1.12.

Strontium increased replication in both wild-type and Casr-knockout mouse osteoblasts despite loss of the rapid ERK response in knockout cells.

The reported Casr knockout abolished rapid strontium-associated ERK1/2 phosphorylation in primary mouse osteoblasts.

Selective COX-2 inhibition abolished the proliferative and anti-apoptotic strontium responses in wild-type and Casr-knockout osteoblasts.

Theoretical attenuation calculations predicted strontium overestimation factors around 9–10.8 for the tested DXA systems, with different factors for single-energy CT.

In calcium/strontium hydroxyapatite mixtures, approximately 1 mol% strontium caused about 10% overestimation of DXA bone mineral density/content across the tested instruments.

An Akt-dependent signaling cascade through CaSR promoted beta-catenin nuclear translocation in strontium-treated primary human osteoblasts.

Strontium chloride and the ranelate preparation stimulated ERK phosphorylation in HEK293 cells transfected with human CaSR.

At 10 mM, strontium did not produce calcium oscillations or activation in the tested human oocytes, although TRPV3 expression and responses to TRPV3 agonists were detected.

Strontium ranelate induced an osteocyte-like phenotype, increased DMP1 and sclerostin mRNA and markedly increased mineralization at reported concentrations of 5 mM or greater.

Strontium increased mineralization in primary human osteoblast cultures in the 2011 study.

In long-term adult human primary osteoblast cultures, strontium ranelate increased the OPG/RANKL ratio and an OPG secretory response.

Strontium inhibited maturation, TRAP expression and hydroxyapatite resorption in human blood-derived osteoclast cultures.

Strontium exposure decreased sclerostin protein expression in primary human osteoblast cultures in the 2011 study.

Strontium-supported keratinocyte cultures lacked the stratification and desmosomes found with 1.8 mM calcium, despite increased cell yield.

In human keratinocytes grown in low-calcium serum-free medium, SrCl2 increased seven-day cell yield, with the reported optimum at 1.8 mM.

Strontium strongly inhibited mineral deposition while collagenous matrix structures remained apparent and osteoblast numbers were unchanged; ionized calcium remained in the medium.

Pretreatment with NPS2390 largely antagonized ranelate-associated proliferation and mineralization in mouse MC3T3-E1 cells.

TRPV3 mediated strontium influx into mouse eggs in the reported channel and activation experiments.

Strontium ranelate disrupted the actin-containing sealing zone of mouse osteoclasts and reduced resorbing activity.

Trpv3-knockout mouse eggs failed to conduct Sr2+ or undergo strontium-induced activation.

The strontium-ranelate study found NFATc1 nuclear translocation and increased transcriptional activity in murine MC3T3-E1 and primary osteoblasts.

Strontium salts reduced osteoclast formation and total resorption pits in mouse marrow cultures; the study attributed much of the lower total resorption to fewer osteoclasts.

Strontium dose-dependently induced apoptosis of primary mature rabbit osteoclasts through a CaSR-linked pathway.

Unlike calcium in the same experimental program, strontium-associated osteoclast apoptosis was independent of inositol 1,4,5-trisphosphate action.

Strontium-induced rabbit osteoclast apoptosis required PLC-dependent signaling and PKC beta II activation, with nuclear NF-kappaB translocation.

Continuous strontium ranelate at 0.01, 0.1 and 1 mM caused 59%, 98% and 100% inhibition of mineralization in 14-day rat calvarial osteoblast cultures; strontium chloride also strongly inhibited it.

The reported uptake half-saturation concentrations were about 13.4 micromolar for Sr2+ and 0.28 micromolar for Ca2+, consistent with lower affinity for strontium.

Omission of ATP or magnesium prevented strontium uptake in the tested renal membrane preparation; other tested nucleotides did not substitute for ATP.

Calcium and strontium each competitively inhibited uptake of the other in the renal-vesicle assay, increasing apparent half-saturation concentration without changing maximum velocity.

Strontium-loaded drinking water at approximately 200 mg/kg/day caused growth-plate expansion, increased osteoid and reduced bone formation in rats with mild chronic renal failure.

Growth-plate and osteoid abnormalities associated with strontium loading reversed after washout in the renal-failure rat study.

Basolateral proximal-tubule membrane vesicles accumulated radiolabeled strontium in an ATP- and Mg2+-dependent transport assay.

Knocking down RHOA abrogated strontium-ranelate-induced cell proliferation and osteoblast gene expression in the murine study.

Knocking down RYK abrogated strontium-ranelate-induced cell proliferation and osteoblast gene expression in the murine study.

SOTI reported BMD increases of 14.4% at the lumbar spine and 8.3% at the femoral neck by month 36.

In 1,649 postmenopausal women with osteoporosis and a prior vertebral fracture, 2 g/day ranelate reduced new vertebral-fracture risk over three years: relative risk 0.59, 95% CI 0.48–0.73.

In the synaptotagmin-1 domain assays, strontium supported C2B/phospholipid complexes but not C2A/phospholipid complexes, whereas calcium supported both.

Synaptotagmin-1 knockout selectively impaired the fast component of both calcium- and strontium-induced neurotransmitter release in mouse neurons.

Unlike calcium, strontium did not stimulate synaptotagmin C2-domain binding to SNARE proteins even at high tested concentrations.

VTE odds ratios were 1.24 (95% CI 0.96–1.61) for current ranelate versus current bisphosphonate use and 1.30 (1.04–1.62) for current versus past ranelate use.

In rat medullary thyroid carcinoma 6-23 cells, strontium biased CaSR signaling toward ERK1/2 relative to Gq/11 and intracellular-calcium mobilization compared with calcium.

Correcting vitamin D deficiency with vitamin D3 did not increase the measured strontium-ranelate absorption in the study of postmenopausal women with low bone mass.

The Wnt antagonists sFRP1 and DKK1 abolished ranelate-induced osteoblast gene expression in the murine cultures.

Strontium ranelate increased WNT3A expression in the murine osteoblast study; calcineurin inhibitors abolished the increase.

Strontium ranelate increased WNT5A expression in the murine osteoblast study; calcineurin inhibitors abolished the increase.

The events it takes part in

Situations it appears in

In the sources

Open hypotheses