Component

Calcium-sensing receptor / CaSR

Independent biological entity. Read linked claims for experimental scope and context.

18 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.

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

What it acts on

  1. CaSR potentiation by NPS R-568 strengthens extracellular-calcium-mediated inhibition of PTH secretion in bovine parathyroid cells.

    Calcium-sensing receptor / CaSR → Parathyroid hormone secretion source_derived_draftungraded
    Experimental context and source evidence
    experimental_model
    Bovine parathyroid cells and human CaSR-expressing HEK293 cells
    limitations
    Pharmacological cell experiment; potentiation required extracellular calcium.
    nutrient_topic
    Calcium research collection; topical membership is not evidence of a direct dietary effect. · Calcium
    organism
    Bos taurus
    plain_language
    Greater calcium-sensor activation reduces hormone release.
    primary_references
    [nemeth1998] Calcimimetics with potent and selective activity on the parathyroid calcium receptor (1998). https://pmc.ncbi.nlm.nih.gov/articles/PMC19959/ DOI: 10.1073/pnas.95.7.4040
    tissue_or_cell_type
    Parathyroid cells

    Calcium: mechanism-first literature curation (2026-09-17) · lines 25–34

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Bovine parathyroid cells and human CaSR-expressing HEK293 cells · source_derived_draft · unverified_draft

    ### casr-calcium-pth-suppression CaSR potentiation by NPS R-568 strengthens extracellular-calcium-mediated inhibition of PTH secretion in bovine parathyroid cells. Condition category: normal nutrient_topic: Calcium research collection; topical membership is not evidence of a direct dietary effect. plain_language: Greater calcium-sensor activation reduces hormone release. organism: Bos taurus tissue_or_cell_type: Parathyroid cells experimental_model: Bovine parathyroid cells and human CaSR-expressing HEK293 cells limitations: Pharmacological cell experiment; potentiation required extracellular calcium. [nemeth1998] Calcimimetics with potent and selective activity on the parathyroid calcium receptor (1998). https://pmc.ncbi.nlm.nih.gov/articles/PMC19959/ DOI: 10.1073/pnas.95.7.4040
    Complete structured claim and evidence

  2. The CaSR E128A variant increases receptor responsiveness and causes dominant hypocalcemia in the studied family.

    Calcium-sensing receptor / CaSR → Serum calcium concentration source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    machinery_impairment Imported condition classification; unverified.
    experimental_model
    Human family; E128A CaSR expressed in Xenopus oocytes
    limitations
    One family and oocyte assays; not dietary calcium deficiency.
    nutrient_topic
    Calcium research collection; topical membership is not evidence of a direct dietary effect. · Calcium
    organism
    Homo sapiens
    plain_language
    An oversensitive sensor can lower blood calcium.
    primary_references
    [pollak1994] Autosomal dominant hypocalcaemia caused by a Ca(2+)-sensing receptor gene mutation (1994). https://pubmed.ncbi.nlm.nih.gov/7874174/ DOI: 10.1038/ng1194-303
    tissue_or_cell_type
    Systemic calcium regulation
    trigger_kind
    machinery_impairment Imported condition classification; unverified.

    Calcium: mechanism-first literature curation (2026-09-17) · lines 47–56

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Human family; E128A CaSR expressed in Xenopus oocytes · source_derived_draft · unverified_draft

    ### casr-gain-hypocalcemia The CaSR E128A variant increases receptor responsiveness and causes dominant hypocalcemia in the studied family. Condition category: machinery_impairment nutrient_topic: Calcium research collection; topical membership is not evidence of a direct dietary effect. plain_language: An oversensitive sensor can lower blood calcium. organism: Homo sapiens tissue_or_cell_type: Systemic calcium regulation experimental_model: Human family; E128A CaSR expressed in Xenopus oocytes limitations: One family and oocyte assays; not dietary calcium deficiency. [pollak1994] Autosomal dominant hypocalcaemia caused by a Ca(2+)-sensing receptor gene mutation (1994). https://pubmed.ncbi.nlm.nih.gov/7874174/ DOI: 10.1038/ng1194-303
    Complete structured claim and evidence

  3. Inactivating CASR variants cause familial hypocalciuric hypercalcemia or neonatal severe hyperparathyroidism.

    Calcium-sensing receptor / CaSR → Serum calcium concentration source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    machinery_impairment Imported condition classification; unverified.
    experimental_model
    Human pedigrees and mutant-receptor expression in Xenopus oocytes
    limitations
    Mutation-specific inherited disease; not evidence of dietary calcium excess.
    nutrient_topic
    Calcium research collection; topical membership is not evidence of a direct dietary effect. · Calcium
    organism
    Homo sapiens
    plain_language
    A faulty sensor can raise blood calcium.
    primary_references
    [pollak1993] Mutations in the human Ca(2+)-sensing receptor gene cause familial hypocalciuric hypercalcemia and neonatal severe hyperparathyroidism (1993). https://pubmed.ncbi.nlm.nih.gov/7916660/ DOI: 10.1016/0092-8674(93)90617-y
    tissue_or_cell_type
    Parathyroid/kidney calcium regulation
    trigger_kind
    machinery_impairment Imported condition classification; unverified.

    Calcium: mechanism-first literature curation (2026-09-17) · lines 36–45

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Human pedigrees and mutant-receptor expression in Xenopus oocytes · source_derived_draft · unverified_draft

    ### casr-loss-hypercalcemia Inactivating CASR variants cause familial hypocalciuric hypercalcemia or neonatal severe hyperparathyroidism. Condition category: machinery_impairment nutrient_topic: Calcium research collection; topical membership is not evidence of a direct dietary effect. plain_language: A faulty sensor can raise blood calcium. organism: Homo sapiens tissue_or_cell_type: Parathyroid/kidney calcium regulation experimental_model: Human pedigrees and mutant-receptor expression in Xenopus oocytes limitations: Mutation-specific inherited disease; not evidence of dietary calcium excess. [pollak1993] Mutations in the human Ca(2+)-sensing receptor gene cause familial hypocalciuric hypercalcemia and neonatal severe hyperparathyroidism (1993). https://pubmed.ncbi.nlm.nih.gov/7916660/ DOI: 10.1016/0092-8674(93)90617-y
    Complete structured claim and evidence

What acts on it

  1. At 1.0 mM Ca, six-hour exposure to 2.0 versus 0.5 mM Mg increased CaSR mRNA and protein in intact rat glands.

    Mg2+ → Calcium-sensing receptor / CaSR source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    magnesium -> calcium sensing
    experimental_model
    Six-hour ex-vivo gland incubation with receptor expression assays
    limitations
    Receptor abundance alone does not prove altered clinical calcium balance; VDR, FGFR1 and Klotho also rose in this experiment.
    nutrient_topic
    Magnesium research collection; topical membership is not evidence of a direct dietary effect. · Magnesium
    organism
    Rattus norvegicus
    plain_language
    Mg exposure can change the amount of the calcium-sensing receptor, adding a slower response to immediate ion sensing.
    primary_references
    [rodriguez-ortiz-2014-pth-context] Magnesium modulates parathyroid hormone secretion and upregulates parathyroid receptor expression at moderately low calcium concentration (2014). https://pubmed.ncbi.nlm.nih.gov/24103811/ DOI: 10.1093/ndt/gft400
    tissue_or_cell_type
    Parathyroid gland

    Magnesium: cross-nutrient mechanisms and deficiency (2026-09-17) · lines 289–299

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Six-hour ex-vivo gland incubation with receptor expression assays · source_derived_draft · unverified_draft

    ### mg-increases-parathyroid-casr-expression At 1.0 mM Ca, six-hour exposure to 2.0 versus 0.5 mM Mg increased CaSR mRNA and protein in intact rat glands. Condition category: normal nutrient_topic: Magnesium research collection; topical membership is not evidence of a direct dietary effect. plain_language: Mg exposure can change the amount of the calcium-sensing receptor, adding a slower response to immediate ion sensing. organism: Rattus norvegicus tissue_or_cell_type: Parathyroid gland experimental_model: Six-hour ex-vivo gland incubation with receptor expression assays limitations: Receptor abundance alone does not prove altered clinical calcium balance; VDR, FGFR1 and Klotho also rose in this experiment. cross_nutrient: magnesium -> calcium sensing [rodriguez-ortiz-2014-pth-context] Magnesium modulates parathyroid hormone secretion and upregulates parathyroid receptor expression at moderately low calcium concentration (2014). https://pubmed.ncbi.nlm.nih.gov/24103811/ DOI: 10.1093/ndt/gft400
    Complete structured claim and evidence

  2. 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

  3. Extracellular calcium activates cloned bovine CaSR expressed in Xenopus oocytes.

    Calcium ion → Calcium-sensing receptor / CaSR source_derived_draftungraded
    Experimental context and source evidence
    experimental_model
    Bovine parathyroid receptor cDNA; Xenopus oocyte expression
    limitations
    Heterologous expression; polyvalent ions also activate this receptor.
    nutrient_topic
    Calcium research collection; topical membership is not evidence of a direct dietary effect. · Calcium
    organism
    Bos taurus receptor in Xenopus laevis
    plain_language
    CaSR senses calcium outside cells.
    primary_references
    [brown1993] Cloning and characterization of an extracellular Ca(2+)-sensing receptor from bovine parathyroid (1993). https://pubmed.ncbi.nlm.nih.gov/8255296/ DOI: 10.1038/366575a0
    tissue_or_cell_type
    Parathyroid-derived receptor; plasma membrane

    Calcium: mechanism-first literature curation (2026-09-17) · lines 14–23

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Bovine parathyroid receptor cDNA; Xenopus oocyte expression · source_derived_draft · unverified_draft

    ### calcium-activates-casr Extracellular calcium activates cloned bovine CaSR expressed in Xenopus oocytes. Condition category: normal nutrient_topic: Calcium research collection; topical membership is not evidence of a direct dietary effect. plain_language: CaSR senses calcium outside cells. organism: Bos taurus receptor in Xenopus laevis tissue_or_cell_type: Parathyroid-derived receptor; plasma membrane experimental_model: Bovine parathyroid receptor cDNA; Xenopus oocyte expression limitations: Heterologous expression; polyvalent ions also activate this receptor. [brown1993] Cloning and characterization of an extracellular Ca(2+)-sensing receptor from bovine parathyroid (1993). https://pubmed.ncbi.nlm.nih.gov/8255296/ DOI: 10.1038/366575a0
    Complete structured claim and evidence

  4. Raising extracellular phosphate inhibited CaSR activity through noncompetitive antagonism in the experimental system.

    Inorganic phosphate (Pi; protonation depends on pH) → Calcium-sensing receptor / CaSR source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/phosphorus-research/31619668.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "e4fe1ed7eb92175f99f446afa19fb184147ceed0413f3a6dffa85aa80927015d", "start_char": 0, "end_char": 1144, "text_sha256": "e4fe1ed7eb92175f99f446afa19fb184147ceed0413f3a6dffa85aa80927015d"}
    experimental_model
    CaSR expression/mutagenesis and isolated human/mouse parathyroid experiments
    exposure
    Extracellular phosphate in pathophysiologic CKD ranges; R62A substitution and mouse Casr deletion
    limitations
    Direct phosphate antagonism was tested separately from calcium regulation; concentrations and model are not dietary thresholds.
    nutrient_topic
    Phosphorus research collection; topical membership is not evidence of a direct dietary effect. · Phosphorus
    organism
    Human CaSR expression system
    plain_language
    Phosphate can act on the calcium-sensing receptor itself, not only change how much calcium is present.
    primary_references
    [phosphorus-p31619668] Phosphate acts directly on the calcium-sensing receptor to stimulate parathyroid hormone secretion. (2019). https://pubmed.ncbi.nlm.nih.gov/31619668/ DOI: 10.1038/s41467-019-12399-9
    tissue_or_cell_type
    CaSR reporter cells and freshly isolated parathyroid cells/glands

    Phosphorus: metabolism, signaling and nutrient connections (2026-09-17) · lines 438–449

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · CaSR expression/mutagenesis and isolated human/mouse parathyroid experiments · source_derived_draft · unverified_draft

    ### phosphorus-casr-antagonism Raising extracellular phosphate inhibited CaSR activity through noncompetitive antagonism in the experimental system. Condition category: normal nutrient_topic: Phosphorus research collection; topical membership is not evidence of a direct dietary effect. plain_language: Phosphate can act on the calcium-sensing receptor itself, not only change how much calcium is present. organism: Human CaSR expression system tissue_or_cell_type: CaSR reporter cells and freshly isolated parathyroid cells/glands experimental_model: CaSR expression/mutagenesis and isolated human/mouse parathyroid experiments limitations: Direct phosphate antagonism was tested separately from calcium regulation; concentrations and model are not dietary thresholds. exposure: Extracellular phosphate in pathophysiologic CKD ranges; R62A substitution and mouse Casr deletion evidence_span: {"source_cache": "artifacts/phosphorus-research/31619668.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "e4fe1ed7eb92175f99f446afa19fb184147ceed0413f3a6dffa85aa80927015d", "start_char": 0, "end_char": 1144, "text_sha256": "e4fe1ed7eb92175f99f446afa19fb184147ceed0413f3a6dffa85aa80927015d"} [phosphorus-p31619668] Phosphate acts directly on the calcium-sensing receptor to stimulate parathyroid hormone secretion. (2019). https://pubmed.ncbi.nlm.nih.gov/31619668/ DOI: 10.1038/s41467-019-12399-9
    Complete structured claim and evidence

Where it participates (unsigned role)

  1. The low-Mg enhancement of CaSR-stimulated GTP analogue binding was lost with the reduced-Mg-sensitivity Galpha-i1 R209C mutant; changing receptor extracellular cation affinity did not remove it.

    GNAI1 R209C experimental mutant → G protein alpha guanine-nucleotide exchange source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    machinery_impairment Imported condition classification; unverified.
    cross_nutrient
    magnesium -> CaSR/PTH -> calcium
    experimental_model
    Engineered receptor and Galpha comparison in reconstituted signaling assays
    limitations
    Engineered mutant evidence is separate from nutrient deficiency; no claim that R209C occurs in affected patients or that every receptor mechanism is excluded.
    nutrient_topic
    Magnesium research collection; topical membership is not evidence of a direct dietary effect. · Magnesium
    organism
    Human CaSR expression system; engineered G-protein preparation
    plain_language
    The mutant experiments placed this Mg effect at the G-protein switch rather than simply at the receptor surface where calcium and magnesium bind.
    primary_references
    [quitterer-2001-magnesium-paradox] Paradoxical block of parathormone secretion is mediated by increased activity of G alpha subunits (2001). https://pubmed.ncbi.nlm.nih.gov/11102444/ DOI: 10.1074/jbc.M007727200
    tissue_or_cell_type
    HEK-293 membrane reconstitution
    trigger_kind
    machinery_impairment Imported condition classification; unverified.

    Magnesium: cross-nutrient mechanisms and deficiency (2026-09-17) · lines 469–479

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Engineered receptor and Galpha comparison in reconstituted signaling assays · source_derived_draft · unverified_draft

    ### galpha-r209c-removes-magnesium-dependence The low-Mg enhancement of CaSR-stimulated GTP analogue binding was lost with the reduced-Mg-sensitivity Galpha-i1 R209C mutant; changing receptor extracellular cation affinity did not remove it. Condition category: machinery_impairment nutrient_topic: Magnesium research collection; topical membership is not evidence of a direct dietary effect. plain_language: The mutant experiments placed this Mg effect at the G-protein switch rather than simply at the receptor surface where calcium and magnesium bind. organism: Human CaSR expression system; engineered G-protein preparation tissue_or_cell_type: HEK-293 membrane reconstitution experimental_model: Engineered receptor and Galpha comparison in reconstituted signaling assays limitations: Engineered mutant evidence is separate from nutrient deficiency; no claim that R209C occurs in affected patients or that every receptor mechanism is excluded. cross_nutrient: magnesium -> CaSR/PTH -> calcium [quitterer-2001-magnesium-paradox] Paradoxical block of parathormone secretion is mediated by increased activity of G alpha subunits (2001). https://pubmed.ncbi.nlm.nih.gov/11102444/ DOI: 10.1074/jbc.M007727200
    Complete structured claim and evidence

  2. Reconstituted G-protein assays supported Mg-dependent restraint of Galpha nucleotide exchange; reduced Mg enhanced signaling associated with basal CaSR activity.

    Mg2+ → G protein alpha guanine-nucleotide exchange source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    nutrient_deficiency Imported condition classification; unverified.
    cross_nutrient
    magnesium -> CaSR/PTH -> calcium
    experimental_model
    CaSR-expressing HEK-293 membranes reconstituted with G proteins
    limitations
    Mechanistic explanation supported by probes; not an established sole cause of human hypomagnesemic hypocalcemia.
    nutrient_topic
    Magnesium research collection; topical membership is not evidence of a direct dietary effect. · Magnesium
    organism
    Human receptor-expression system with purified/recombinant G proteins
    plain_language
    Less Mg can loosen the restraint on the G-protein switch, allowing the receptor pathway to suppress PTH more strongly.
    primary_references
    [quitterer-2001-magnesium-paradox] Paradoxical block of parathormone secretion is mediated by increased activity of G alpha subunits (2001). https://pubmed.ncbi.nlm.nih.gov/11102444/ DOI: 10.1074/jbc.M007727200
    tissue_or_cell_type
    Reconstituted membrane signaling system
    trigger_kind
    nutrient_deficiency Imported condition classification; unverified.

    Magnesium: cross-nutrient mechanisms and deficiency (2026-09-17) · lines 457–467

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · CaSR-expressing HEK-293 membranes reconstituted with G proteins · source_derived_draft · unverified_draft

    ### low-mg-galpha-exchange-explains-paradox Reconstituted G-protein assays supported Mg-dependent restraint of Galpha nucleotide exchange; reduced Mg enhanced signaling associated with basal CaSR activity. Condition category: nutrient_deficiency nutrient_topic: Magnesium research collection; topical membership is not evidence of a direct dietary effect. plain_language: Less Mg can loosen the restraint on the G-protein switch, allowing the receptor pathway to suppress PTH more strongly. organism: Human receptor-expression system with purified/recombinant G proteins tissue_or_cell_type: Reconstituted membrane signaling system experimental_model: CaSR-expressing HEK-293 membranes reconstituted with G proteins limitations: Mechanistic explanation supported by probes; not an established sole cause of human hypomagnesemic hypocalcemia. cross_nutrient: magnesium -> CaSR/PTH -> calcium [quitterer-2001-magnesium-paradox] Paradoxical block of parathormone secretion is mediated by increased activity of G alpha subunits (2001). https://pubmed.ncbi.nlm.nih.gov/11102444/ DOI: 10.1074/jbc.M007727200
    Complete structured claim and evidence

  3. Pertussis-toxin pretreatment abolished the suppression of PTH release by low Mg in the parathyroid-cell assay.

    Pertussis toxin → Parathyroid hormone secretion source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    nutrient_deficiency Imported condition classification; unverified.
    cross_nutrient
    magnesium -> CaSR/PTH -> calcium
    experimental_model
    Dispersed human parathyroid cells from hyperparathyroid tissue
    limitations
    Pharmacologic pathway probe, not evidence for toxin use in patients; no full in-vivo chain tested.
    nutrient_topic
    Magnesium research collection; topical membership is not evidence of a direct dietary effect. · Magnesium
    organism
    Homo sapiens
    plain_language
    Blocking Gi/o signaling removed the low-Mg secretory brake, placing these signaling proteins in the experimental pathway.
    primary_references
    [quitterer-2001-magnesium-paradox] Paradoxical block of parathormone secretion is mediated by increased activity of G alpha subunits (2001). https://pubmed.ncbi.nlm.nih.gov/11102444/ DOI: 10.1074/jbc.M007727200
    tissue_or_cell_type
    Parathyroid cells in vitro
    trigger_kind
    nutrient_deficiency Imported condition classification; unverified.

    Magnesium: cross-nutrient mechanisms and deficiency (2026-09-17) · lines 445–455

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Dispersed human parathyroid cells from hyperparathyroid tissue · source_derived_draft · unverified_draft

    ### pertussis-toxin-removes-low-mg-pth-block Pertussis-toxin pretreatment abolished the suppression of PTH release by low Mg in the parathyroid-cell assay. Condition category: nutrient_deficiency nutrient_topic: Magnesium research collection; topical membership is not evidence of a direct dietary effect. plain_language: Blocking Gi/o signaling removed the low-Mg secretory brake, placing these signaling proteins in the experimental pathway. organism: Homo sapiens tissue_or_cell_type: Parathyroid cells in vitro experimental_model: Dispersed human parathyroid cells from hyperparathyroid tissue limitations: Pharmacologic pathway probe, not evidence for toxin use in patients; no full in-vivo chain tested. cross_nutrient: magnesium -> CaSR/PTH -> calcium [quitterer-2001-magnesium-paradox] Paradoxical block of parathormone secretion is mediated by increased activity of G alpha subunits (2001). https://pubmed.ncbi.nlm.nih.gov/11102444/ DOI: 10.1074/jbc.M007727200
    Complete structured claim and evidence

  4. Low Mg enhanced CaSR-associated inhibition of cAMP in the tested parathyroid and receptor-expression cell systems.

    Mg2+ → Cyclic adenosine monophosphate source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    nutrient_deficiency Imported condition classification; unverified.
    cross_nutrient
    magnesium -> CaSR/PTH -> calcium
    experimental_model
    Dispersed human parathyroid cells from hyperparathyroid tissue
    limitations
    This is pathway-dependent inhibition, not proof that every cellular adenylyl cyclase fails whenever Mg is low.
    nutrient_topic
    Magnesium research collection; topical membership is not evidence of a direct dietary effect. · Magnesium
    organism
    Homo sapiens
    plain_language
    Low Mg strengthened a signaling arm that reduces the cAMP signal associated with PTH release.
    primary_references
    [quitterer-2001-magnesium-paradox] Paradoxical block of parathormone secretion is mediated by increased activity of G alpha subunits (2001). https://pubmed.ncbi.nlm.nih.gov/11102444/ DOI: 10.1074/jbc.M007727200
    tissue_or_cell_type
    Parathyroid cells in vitro
    trigger_kind
    nutrient_deficiency Imported condition classification; unverified.

    Magnesium: cross-nutrient mechanisms and deficiency (2026-09-17) · lines 433–443

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Dispersed human parathyroid cells from hyperparathyroid tissue · source_derived_draft · unverified_draft

    ### very-low-mg-enhances-casr-camp-inhibition Low Mg enhanced CaSR-associated inhibition of cAMP in the tested parathyroid and receptor-expression cell systems. Condition category: nutrient_deficiency nutrient_topic: Magnesium research collection; topical membership is not evidence of a direct dietary effect. plain_language: Low Mg strengthened a signaling arm that reduces the cAMP signal associated with PTH release. organism: Homo sapiens tissue_or_cell_type: Parathyroid cells in vitro experimental_model: Dispersed human parathyroid cells from hyperparathyroid tissue limitations: This is pathway-dependent inhibition, not proof that every cellular adenylyl cyclase fails whenever Mg is low. cross_nutrient: magnesium -> CaSR/PTH -> calcium [quitterer-2001-magnesium-paradox] Paradoxical block of parathormone secretion is mediated by increased activity of G alpha subunits (2001). https://pubmed.ncbi.nlm.nih.gov/11102444/ DOI: 10.1074/jbc.M007727200
    Complete structured claim and evidence

  5. Low extracellular Mg increased inositol-phosphate generation in parathyroid cells; CaSR-expressing HEK-293 cells reproduced the enhancement.

    Mg2+ → Inositol phosphates source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    nutrient_deficiency Imported condition classification; unverified.
    cross_nutrient
    magnesium -> CaSR/PTH -> calcium
    experimental_model
    Dispersed human parathyroid cells from hyperparathyroid tissue
    limitations
    The collective assay did not separately quantify every inositol-phosphate species; tissue disease and recombinant expression constrain transfer.
    nutrient_topic
    Magnesium research collection; topical membership is not evidence of a direct dietary effect. · Magnesium
    organism
    Homo sapiens
    plain_language
    The calcium-sensing pathway became more active under low Mg in these cell experiments.
    primary_references
    [quitterer-2001-magnesium-paradox] Paradoxical block of parathormone secretion is mediated by increased activity of G alpha subunits (2001). https://pubmed.ncbi.nlm.nih.gov/11102444/ DOI: 10.1074/jbc.M007727200
    tissue_or_cell_type
    Parathyroid cells in vitro
    trigger_kind
    nutrient_deficiency Imported condition classification; unverified.

    Magnesium: cross-nutrient mechanisms and deficiency (2026-09-17) · lines 421–431

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Dispersed human parathyroid cells from hyperparathyroid tissue · source_derived_draft · unverified_draft

    ### very-low-mg-enhances-inositol-phosphates Low extracellular Mg increased inositol-phosphate generation in parathyroid cells; CaSR-expressing HEK-293 cells reproduced the enhancement. Condition category: nutrient_deficiency nutrient_topic: Magnesium research collection; topical membership is not evidence of a direct dietary effect. plain_language: The calcium-sensing pathway became more active under low Mg in these cell experiments. organism: Homo sapiens tissue_or_cell_type: Parathyroid cells in vitro experimental_model: Dispersed human parathyroid cells from hyperparathyroid tissue limitations: The collective assay did not separately quantify every inositol-phosphate species; tissue disease and recombinant expression constrain transfer. cross_nutrient: magnesium -> CaSR/PTH -> calcium [quitterer-2001-magnesium-paradox] Paradoxical block of parathormone secretion is mediated by increased activity of G alpha subunits (2001). https://pubmed.ncbi.nlm.nih.gov/11102444/ DOI: 10.1074/jbc.M007727200
    Complete structured claim and evidence

  6. Lowering extracellular Mg to 0.1 mM suppressed PTH release from dispersed human parathyroid cells in the tested media.

    Mg2+ → Parathyroid hormone secretion source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    nutrient_deficiency Imported condition classification; unverified.
    cross_nutrient
    magnesium -> CaSR/PTH -> calcium
    experimental_model
    Dispersed human parathyroid cells from hyperparathyroid tissue
    limitations
    Experiment used hyperparathyroid tissue; culture concentrations are not clinical deficiency cutoffs.
    nutrient_topic
    Magnesium research collection; topical membership is not evidence of a direct dietary effect. · Magnesium
    organism
    Homo sapiens
    plain_language
    At very low Mg, the gland cells released less PTH even though simple loss of an inhibitory extracellular ion might predict more release.
    primary_references
    [quitterer-2001-magnesium-paradox] Paradoxical block of parathormone secretion is mediated by increased activity of G alpha subunits (2001). https://pubmed.ncbi.nlm.nih.gov/11102444/ DOI: 10.1074/jbc.M007727200
    tissue_or_cell_type
    Parathyroid cells in vitro
    trigger_kind
    nutrient_deficiency Imported condition classification; unverified.

    Magnesium: cross-nutrient mechanisms and deficiency (2026-09-17) · lines 409–419

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Dispersed human parathyroid cells from hyperparathyroid tissue · source_derived_draft · unverified_draft

    ### very-low-mg-suppresses-pth-in-human-cells Lowering extracellular Mg to 0.1 mM suppressed PTH release from dispersed human parathyroid cells in the tested media. Condition category: nutrient_deficiency nutrient_topic: Magnesium research collection; topical membership is not evidence of a direct dietary effect. plain_language: At very low Mg, the gland cells released less PTH even though simple loss of an inhibitory extracellular ion might predict more release. organism: Homo sapiens tissue_or_cell_type: Parathyroid cells in vitro experimental_model: Dispersed human parathyroid cells from hyperparathyroid tissue limitations: Experiment used hyperparathyroid tissue; culture concentrations are not clinical deficiency cutoffs. cross_nutrient: magnesium -> CaSR/PTH -> calcium [quitterer-2001-magnesium-paradox] Paradoxical block of parathormone secretion is mediated by increased activity of G alpha subunits (2001). https://pubmed.ncbi.nlm.nih.gov/11102444/ DOI: 10.1074/jbc.M007727200
    Complete structured claim and evidence

  7. 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

  8. 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

  9. 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

  10. Chronic lithium-treated patients required a higher calcium level for comparable PTH suppression during calcium/citrate infusions.

    Lithium ion (Li+) → Human calcium–PTH suppression set-point source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    biomarker_context Imported condition classification; unverified.
    evidence_access
    Primary abstract
    experimental_model
    Seven lithium-treated women versus seven controls; mean set-point 5.08 versus 4.88 mg/dL ionized calcium.
    limitations
    Supports altered feedback, not direct lithium binding to human CaSR.
    nutrient_topic
    Lithium collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Lithium
    plain_language
    Calcium feedback to the parathyroid gland was reset.
    primary_references
    Alterations in parathyroid dynamics in lithium-treated subjects. · 1997 · https://pubmed.ncbi.nlm.nih.gov/9284708/ · DOI 10.1210/jcem.82.9.4218
    trigger_kind
    biomarker_context Imported condition classification; unverified.

    Lithium: metal-sensitive enzymes, transport and cross-nutrient mechanisms (2026-09-19) · lines 384–390

    AI-assisted research curation; primary references, access levels and experimental limitations individually identified. Not publisher full text. · supports · Seven lithium-treated women versus seven controls; mean set-point 5.08 versus 4.88 mg/dL ionized calcium. · source_derived_draft · unverified_draft

    ## lithium-pth-setpoint Calcium feedback to the parathyroid gland was reset. Chronic lithium-treated patients required a higher calcium level for comparable PTH suppression during calcium/citrate infusions. Model: Seven lithium-treated women versus seven controls; mean set-point 5.08 versus 4.88 mg/dL ionized calcium. Limitations: Supports altered feedback, not direct lithium binding to human CaSR. Evidence access: Primary abstract Alterations in parathyroid dynamics in lithium-treated subjects. · 1997 · https://pubmed.ncbi.nlm.nih.gov/9284708/ · DOI 10.1210/jcem.82.9.4218
    Complete structured claim and evidence

  11. Pathophysiologic phosphate concentrations rapidly and reversibly increased PTH secretion from freshly isolated human parathyroid cells.

    Inorganic phosphate (Pi; protonation depends on pH) → Human parathyroid hormone secretion source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/phosphorus-research/31619668.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "e4fe1ed7eb92175f99f446afa19fb184147ceed0413f3a6dffa85aa80927015d", "start_char": 0, "end_char": 1144, "text_sha256": "e4fe1ed7eb92175f99f446afa19fb184147ceed0413f3a6dffa85aa80927015d"}
    experimental_model
    CaSR expression/mutagenesis and isolated human/mouse parathyroid experiments
    exposure
    Extracellular phosphate in pathophysiologic CKD ranges; R62A substitution and mouse Casr deletion
    limitations
    Direct phosphate antagonism was tested separately from calcium regulation; concentrations and model are not dietary thresholds.
    nutrient_topic
    Phosphorus research collection; topical membership is not evidence of a direct dietary effect. · Phosphorus
    organism
    Human
    plain_language
    Human parathyroid cells responded directly to the phosphate challenge.
    primary_references
    [phosphorus-p31619668] Phosphate acts directly on the calcium-sensing receptor to stimulate parathyroid hormone secretion. (2019). https://pubmed.ncbi.nlm.nih.gov/31619668/ DOI: 10.1038/s41467-019-12399-9
    tissue_or_cell_type
    CaSR reporter cells and freshly isolated parathyroid cells/glands

    Phosphorus: metabolism, signaling and nutrient connections (2026-09-17) · lines 451–462

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · CaSR expression/mutagenesis and isolated human/mouse parathyroid experiments · source_derived_draft · unverified_draft

    ### phosphorus-human-pth Pathophysiologic phosphate concentrations rapidly and reversibly increased PTH secretion from freshly isolated human parathyroid cells. Condition category: normal nutrient_topic: Phosphorus research collection; topical membership is not evidence of a direct dietary effect. plain_language: Human parathyroid cells responded directly to the phosphate challenge. organism: Human tissue_or_cell_type: CaSR reporter cells and freshly isolated parathyroid cells/glands experimental_model: CaSR expression/mutagenesis and isolated human/mouse parathyroid experiments limitations: Direct phosphate antagonism was tested separately from calcium regulation; concentrations and model are not dietary thresholds. exposure: Extracellular phosphate in pathophysiologic CKD ranges; R62A substitution and mouse Casr deletion evidence_span: {"source_cache": "artifacts/phosphorus-research/31619668.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "e4fe1ed7eb92175f99f446afa19fb184147ceed0413f3a6dffa85aa80927015d", "start_char": 0, "end_char": 1144, "text_sha256": "e4fe1ed7eb92175f99f446afa19fb184147ceed0413f3a6dffa85aa80927015d"} [phosphorus-p31619668] Phosphate acts directly on the calcium-sensing receptor to stimulate parathyroid hormone secretion. (2019). https://pubmed.ncbi.nlm.nih.gov/31619668/ DOI: 10.1038/s41467-019-12399-9
    Complete structured claim and evidence

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