Tissue-nonspecific alkaline phosphatase ALPL / TNAP

availability_state

machinery_impairment Imported condition classification; unverified.

experimental_model

Over 100 hypophosphatasia cases, serum vitamers and available CSF; supplementation/enzyme-replacement subgroups.

exposure

Observational clinical sampling by subtype and treatment; no randomized B6 efficacy comparison.

limitations

Nonrandomized treatment comparisons; does not directly measure transport flux or establish neurological benefit.

nutrient_topic

Vitamin B6 research collection; topical membership is not evidence of a direct dietary effect. · Vitamin B6

organism

Homo sapiens

plain_language

Restoring enzyme activity changed B6 handling markers, including the sampled fluid around the brain.

primary_references

[b6-akitomo2025] Vitamin B6 Status in Hypophosphatasia: Association With Clinical Severity, Diagnostic Utility, and Effects on Vitamin B6 Metabolism by Supplementation and Enzyme Replacement Therapy (2025). https://pubmed.ncbi.nlm.nih.gov/40387451/ DOI: 10.1002/jimd.70036

tissue_or_cell_type

Serum and cerebrospinal fluid

trigger_kind

machinery_impairment Imported condition classification; unverified.

Vitamin B6: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 1657–1667

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Over 100 hypophosphatasia cases, serum vitamers and available CSF; supplementation/enzyme-replacement subgroups. · source_derived_draft · unverified_draft

### b6-hpp-enzyme-replacement-ratio Enzyme replacement was associated with lower serum PLP: PL ratios; CSF PL was higher in treated than untreated cases. Condition category: machinery_impairment nutrient_topic: Vitamin B6 research collection; topical membership is not evidence of a direct dietary effect. plain_language: Restoring enzyme activity changed B6 handling markers, including the sampled fluid around the brain. organism: Homo sapiens tissue_or_cell_type: Serum and cerebrospinal fluid experimental_model: Over 100 hypophosphatasia cases, serum vitamers and available CSF; supplementation/enzyme-replacement subgroups. limitations: Nonrandomized treatment comparisons; does not directly measure transport flux or establish neurological benefit. exposure: Observational clinical sampling by subtype and treatment; no randomized B6 efficacy comparison. [b6-akitomo2025] Vitamin B6 Status in Hypophosphatasia: Association With Clinical Severity, Diagnostic Utility, and Effects on Vitamin B6 Metabolism by Supplementation and Enzyme Replacement Therapy (2025). https://pubmed.ncbi.nlm.nih.gov/40387451/ DOI: 10.1002/jimd.70036

availability_state

machinery_impairment Imported condition classification; unverified.

cross_nutrient

ALPL links mineralization biology with B6 handling; this result alone does not imply calcium causes B6 deficiency.

experimental_model

Fourteen hypophosphatasia patients compared with 38 controls; urinary catabolite studied in four affected children.

exposure

Endogenous ALPL enzyme deficiency; ordinary dietary B6 in urinary subset.

limitations

Small heterogeneous disease cohort; concentrations are not diagnostic thresholds for general nutrition.

nutrient_topic

Vitamin B6 research collection; topical membership is not evidence of a direct dietary effect. · Vitamin B6

organism

Homo sapiens

plain_language

A high B6-related blood measurement can reflect faulty processing rather than extra intake.

primary_references

[b6-whyte1985] Markedly increased circulating pyridoxal-5'-phosphate levels in hypophosphatasia. Alkaline phosphatase acts in vitamin B6 metabolism (1985). https://pubmed.ncbi.nlm.nih.gov/4031070/ DOI: 10.1172/jci112031

tissue_or_cell_type

Human blood and whole-body measurements

trigger_kind

machinery_impairment Imported condition classification; unverified.

Vitamin B6: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 1608–1619

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Fourteen hypophosphatasia patients compared with 38 controls; urinary catabolite studied in four affected children. · source_derived_draft · unverified_draft

### b6-hpp-high-plasma-plp All 14 hypophosphatasia patients had elevated plasma PLP; the mean was 1174 nM versus 57 nM in controls. Condition category: machinery_impairment nutrient_topic: Vitamin B6 research collection; topical membership is not evidence of a direct dietary effect. plain_language: A high B6-related blood measurement can reflect faulty processing rather than extra intake. organism: Homo sapiens tissue_or_cell_type: Human blood and whole-body measurements experimental_model: Fourteen hypophosphatasia patients compared with 38 controls; urinary catabolite studied in four affected children. limitations: Small heterogeneous disease cohort; concentrations are not diagnostic thresholds for general nutrition. exposure: Endogenous ALPL enzyme deficiency; ordinary dietary B6 in urinary subset. cross_nutrient: ALPL links mineralization biology with B6 handling; this result alone does not imply calcium causes B6 deficiency. [b6-whyte1985] Markedly increased circulating pyridoxal-5'-phosphate levels in hypophosphatasia. Alkaline phosphatase acts in vitamin B6 metabolism (1985). https://pubmed.ncbi.nlm.nih.gov/4031070/ DOI: 10.1172/jci112031

availability_state

biomarker_context Imported condition classification; unverified.

experimental_model

Primary measurement study in 150 children/adolescents with hypophosphatasia and healthy pediatric comparators; adult observations separately discussed.

exposure

ALPL-related hypophosphatasia, variable clinical severity; plasma vitamers, not direct all-tissue cofactor measurement.

limitations

Cohort result cannot be transferred to every severe neonatal case; does not establish all-tissue sufficiency.

nutrient_topic

Vitamin B6 research collection; topical membership is not evidence of a direct dietary effect. · Vitamin B6

organism

Homo sapiens

plain_language

ALPL impairment did not make circulating pyridoxal universally low in this pediatric cohort.

primary_references

[b6-whyte2022] Hypophosphatasia: Vitamin B6 status of affected children and adults (2022). https://pubmed.ncbi.nlm.nih.gov/34547524/ DOI: 10.1016/j.bone.2021.116204

tissue_or_cell_type

Human blood and whole-body measurements

trigger_kind

biomarker_context Imported condition classification; unverified.

Vitamin B6: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 1633–1643

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Primary measurement study in 150 children/adolescents with hypophosphatasia and healthy pediatric comparators; adult observations separately discussed. · source_derived_draft · unverified_draft

### b6-hpp-pediatric-pyridoxal In 150 affected children/adolescents, mean plasma pyridoxal was 66.7 versus 37.1 nM in controls; mean 4-pyridoxic acid did not differ. Condition category: biomarker_context nutrient_topic: Vitamin B6 research collection; topical membership is not evidence of a direct dietary effect. plain_language: ALPL impairment did not make circulating pyridoxal universally low in this pediatric cohort. organism: Homo sapiens tissue_or_cell_type: Human blood and whole-body measurements experimental_model: Primary measurement study in 150 children/adolescents with hypophosphatasia and healthy pediatric comparators; adult observations separately discussed. limitations: Cohort result cannot be transferred to every severe neonatal case; does not establish all-tissue sufficiency. exposure: ALPL-related hypophosphatasia, variable clinical severity; plasma vitamers, not direct all-tissue cofactor measurement. [b6-whyte2022] Hypophosphatasia: Vitamin B6 status of affected children and adults (2022). https://pubmed.ncbi.nlm.nih.gov/34547524/ DOI: 10.1016/j.bone.2021.116204

availability_state

biomarker_context Imported condition classification; unverified.

experimental_model

Over 100 hypophosphatasia cases, serum vitamers and available CSF; supplementation/enzyme-replacement subgroups.

exposure

Observational clinical sampling by subtype and treatment; no randomized B6 efficacy comparison.

limitations

Observational subtype comparison; contextual difference from broader pediatric cohorts, not an editorial conflict.

nutrient_topic

Vitamin B6 research collection; topical membership is not evidence of a direct dietary effect. · Vitamin B6

organism

Homo sapiens

plain_language

Disease severity changes which B6 forms accumulate or become low.

primary_references

[b6-akitomo2025] Vitamin B6 Status in Hypophosphatasia: Association With Clinical Severity, Diagnostic Utility, and Effects on Vitamin B6 Metabolism by Supplementation and Enzyme Replacement Therapy (2025). https://pubmed.ncbi.nlm.nih.gov/40387451/ DOI: 10.1002/jimd.70036

tissue_or_cell_type

Human blood and whole-body measurements

trigger_kind

biomarker_context Imported condition classification; unverified.

Vitamin B6: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 1645–1655

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Over 100 hypophosphatasia cases, serum vitamers and available CSF; supplementation/enzyme-replacement subgroups. · source_derived_draft · unverified_draft

### b6-hpp-severity-vitamer-pattern In the 2025 cohort, untreated HPP had higher serum PLP and PLP: PL ratios; severe perinatal disease had lower PL than benign perinatal disease and the lowest PA across subtypes. Condition category: biomarker_context nutrient_topic: Vitamin B6 research collection; topical membership is not evidence of a direct dietary effect. plain_language: Disease severity changes which B6 forms accumulate or become low. organism: Homo sapiens tissue_or_cell_type: Human blood and whole-body measurements experimental_model: Over 100 hypophosphatasia cases, serum vitamers and available CSF; supplementation/enzyme-replacement subgroups. limitations: Observational subtype comparison; contextual difference from broader pediatric cohorts, not an editorial conflict. exposure: Observational clinical sampling by subtype and treatment; no randomized B6 efficacy comparison. [b6-akitomo2025] Vitamin B6 Status in Hypophosphatasia: Association With Clinical Severity, Diagnostic Utility, and Effects on Vitamin B6 Metabolism by Supplementation and Enzyme Replacement Therapy (2025). https://pubmed.ncbi.nlm.nih.gov/40387451/ DOI: 10.1002/jimd.70036

availability_state

biomarker_context Imported condition classification; unverified.

experimental_model

Fourteen hypophosphatasia patients compared with 38 controls; urinary catabolite studied in four affected children.

exposure

Endogenous ALPL enzyme deficiency; ordinary dietary B6 in urinary subset.

limitations

Small subset; normal urinary excretion does not prove normal every-tissue metabolism.

nutrient_topic

Vitamin B6 research collection; topical membership is not evidence of a direct dietary effect. · Vitamin B6

organism

Homo sapiens

plain_language

The circulating vitamin and its urinary breakdown product told different stories.

primary_references

[b6-whyte1985] Markedly increased circulating pyridoxal-5'-phosphate levels in hypophosphatasia. Alkaline phosphatase acts in vitamin B6 metabolism (1985). https://pubmed.ncbi.nlm.nih.gov/4031070/ DOI: 10.1172/jci112031

tissue_or_cell_type

Human blood and whole-body measurements

trigger_kind

biomarker_context Imported condition classification; unverified.

Vitamin B6: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 1621–1631

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Fourteen hypophosphatasia patients compared with 38 controls; urinary catabolite studied in four affected children. · source_derived_draft · unverified_draft

### b6-hpp-urinary-catabolite Urinary 4-pyridoxic acid was unremarkable in four affected children consuming normal dietary B6 despite markedly elevated plasma PLP. Condition category: biomarker_context nutrient_topic: Vitamin B6 research collection; topical membership is not evidence of a direct dietary effect. plain_language: The circulating vitamin and its urinary breakdown product told different stories. organism: Homo sapiens tissue_or_cell_type: Human blood and whole-body measurements experimental_model: Fourteen hypophosphatasia patients compared with 38 controls; urinary catabolite studied in four affected children. limitations: Small subset; normal urinary excretion does not prove normal every-tissue metabolism. exposure: Endogenous ALPL enzyme deficiency; ordinary dietary B6 in urinary subset. [b6-whyte1985] Markedly increased circulating pyridoxal-5'-phosphate levels in hypophosphatasia. Alkaline phosphatase acts in vitamin B6 metabolism (1985). https://pubmed.ncbi.nlm.nih.gov/4031070/ DOI: 10.1172/jci112031

evidence_location

Indexed abstract: intact/disrupted cells, PI-PLC and patient enzyme activity

experimental_model

Normal and hypophosphatasia human skin fibroblasts.

exposure

Extracellular PLP; intact versus disrupted cells; PI-PLC release.

limitations

Directly demonstrated in fibroblasts; does not itself measure brain entry.

nutrient_topic

Vitamin B6 research collection; topical membership is not evidence of a direct dietary effect. · Vitamin B6

organism

Homo sapiens

plain_language

Cell-surface ALPL processes PLP outside the cell.

primary_references

[fedde1990] Alkaline phosphatase (tissue-nonspecific isoenzyme) is a phosphoethanolamine and pyridoxal-5'-phosphate ectophosphatase: normal and hypophosphatasia fibroblast study. (1990). https://pubmed.ncbi.nlm.nih.gov/2220817/

tissue_or_cell_type

Skin fibroblasts

Vitamin B6: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 309–320

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Normal and hypophosphatasia human skin fibroblasts. · source_derived_draft · unverified_draft

### b6-transport-alpl-ecto Human fibroblast ALPL hydrolyzed extracellular micromolar PLP at physiological pH; intact-cell and PI-PLC experiments supported lipid-anchored ecto-orientation. Condition category: normal nutrient_topic: Vitamin B6 research collection; topical membership is not evidence of a direct dietary effect. plain_language: Cell-surface ALPL processes PLP outside the cell. organism: Homo sapiens tissue_or_cell_type: Skin fibroblasts experimental_model: Normal and hypophosphatasia human skin fibroblasts. limitations: Directly demonstrated in fibroblasts; does not itself measure brain entry. exposure: Extracellular PLP; intact versus disrupted cells; PI-PLC release. evidence_location: Indexed abstract: intact/disrupted cells, PI-PLC and patient enzyme activity [fedde1990] Alkaline phosphatase (tissue-nonspecific isoenzyme) is a phosphoethanolamine and pyridoxal-5'-phosphate ectophosphatase: normal and hypophosphatasia fibroblast study. (1990). https://pubmed.ncbi.nlm.nih.gov/2220817/

availability_state

machinery_impairment Imported condition classification; unverified.

evidence_span

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experimental_model

Case report of an infant with a novel homozygous ALPL mutation

exposure

Loss-of-function ALPL mutation with pyridoxine-responsive seizures

limitations

A single case report. It shows the association in one patient and cannot establish how often it occurs or the mechanism by which the cofactor becomes unavailable.

nutrient_topic

GABA research collection; topical membership is not evidence of a direct clinical effect, and the sign of a GABA response depends on the chloride gradient of the cell it was measured in. · Gamma-aminobutyric acid

organism

Human

plain_language

A child whose alkaline phosphatase does not work had seizures that only pyridoxine controlled.

primary_references

[gb-p27086862] Pyridoxine-Responsive Seizures in Infantile Hypophosphatasia and a Novel Homozygous Mutation in ALPL Gene. (2016). https://pubmed.ncbi.nlm.nih.gov/27086862/ DOI: 10.4274/jcrpe.2798

tissue_or_cell_type

Bone and nervous system

trigger_kind

machinery_impairment Imported condition classification; unverified.

GABA: a ligand with no sign of its own, the cofactor that limits its synthesis, the barrier that keeps it out of the brain, and the immune settings where the same molecule protects and harms (2026-09-22) · lines 131–142

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Case report of an infant with a novel homozygous ALPL mutation · source_derived_draft · unverified_draft

### gb-losing-the-phosphatase-costs-the-cofactor Hypophosphatasia is a rare inherited disorder of bone and mineral metabolism caused by loss-of-function mutations in the ALPL gene, characterized by defective bone and tooth mineralisation associated with low serum and bone alkaline phosphatase activity, severe forms may present with neurological problems such as seizures, hypotonia and irritability, and here an infantile hypophosphatasia patient presented with pyridoxine-responsive seizures and a novel homozygous mutation in the ALPL gene was detected, with a limited number of such patients in the literature. Condition category: machinery_impairment nutrient_topic: GABA research collection; topical membership is not evidence of a direct clinical effect, and the sign of a GABA response depends on the chloride gradient of the cell it was measured in. plain_language: A child whose alkaline phosphatase does not work had seizures that only pyridoxine controlled. organism: Human tissue_or_cell_type: Bone and nervous system experimental_model: Case report of an infant with a novel homozygous ALPL mutation limitations: A single case report. It shows the association in one patient and cannot establish how often it occurs or the mechanism by which the cofactor becomes unavailable. exposure: Loss-of-function ALPL mutation with pyridoxine-responsive seizures evidence_span: {"source_cache": "artifacts/gaba-research/27086862.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "cb18a717a009e567b4480c6826b39f15109745dbb646c752ad66376b6b107854", "start_char": 0, "end_char": 1299, "text_sha256": "cb18a717a009e567b4480c6826b39f15109745dbb646c752ad66376b6b107854"} [gb-p27086862] Pyridoxine-Responsive Seizures in Infantile Hypophosphatasia and a Novel Homozygous Mutation in ALPL Gene. (2016). https://pubmed.ncbi.nlm.nih.gov/27086862/ DOI: 10.4274/jcrpe.2798

cross_nutrient

Vitamin D–calcium–phosphate regulation.

evidence_locator

Figure 6 and adjacent Results: mineralization restored by TNAP

evidence_scope

D3 active metabolite or VDR machinery experiment; not a direct D2-versus-D3 comparison.

experimental_model

Differentiated primary mouse osteoblasts; Alizarin red mineralization and conditioned-medium pyrophosphate assays

exposure

10^-8 M calcitriol and 1 U/mL added TNAP for 4 days; companion cultures tested 5 x 10^-6 M pyrophosphate.

limitations

Enzyme-addition culture rescue supports pyrophosphate involvement; it does not quantify human bone outcomes or establish the contribution of each calcitriol-regulated gene.

nutrient

Vitamin D2 and D3 · Vitamin D2 and D3

nutrient_topic

Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. · Vitamin D2 and D3

organism

Mus musculus

plain_language

Removing the pyrophosphate brake restored mineral deposition in the treated cultures.

primary_references

[vdm-lieben2012] Normocalcemia is maintained in mice under conditions of calcium malabsorption by vitamin D-induced inhibition of bone mineralization. (2012). https://pubmed.ncbi.nlm.nih.gov/22523068/ DOI: 10.1172/jci45890

tissue_or_cell_type

Osteoblast extracellular matrix

Vitamin D2 and D3: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 825–839

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Differentiated primary mouse osteoblasts; Alizarin red mineralization and conditioned-medium pyrophosphate assays · source_derived_draft · unverified_draft

### vdm-tnap-rescues-calcitriol-culture-mineralization Added TNAP restored mineralization in calcitriol-treated differentiated mouse osteoblast cultures while lowering extracellular pyrophosphate. Condition category: normal nutrient_topic: Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. plain_language: Removing the pyrophosphate brake restored mineral deposition in the treated cultures. organism: Mus musculus tissue_or_cell_type: Osteoblast extracellular matrix experimental_model: Differentiated primary mouse osteoblasts; Alizarin red mineralization and conditioned-medium pyrophosphate assays limitations: Enzyme-addition culture rescue supports pyrophosphate involvement; it does not quantify human bone outcomes or establish the contribution of each calcitriol-regulated gene. exposure: 10^-8 M calcitriol and 1 U/mL added TNAP for 4 days; companion cultures tested 5 x 10^-6 M pyrophosphate. cross_nutrient: Vitamin D–calcium–phosphate regulation. evidence_locator: Figure 6 and adjacent Results: mineralization restored by TNAP nutrient: Vitamin D2 and D3 evidence_scope: D3 active metabolite or VDR machinery experiment; not a direct D2-versus-D3 comparison. [vdm-lieben2012] Normocalcemia is maintained in mice under conditions of calcium malabsorption by vitamin D-induced inhibition of bone mineralization. (2012). https://pubmed.ncbi.nlm.nih.gov/22523068/ DOI: 10.1172/jci45890

availability_state

machinery_impairment Imported condition classification; unverified.

evidence_span

{"source_cache": "artifacts/creatine-research/42020733.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "232795a0a16f2f2445cd43c34e4542fb2470eefb41f72fa9dc655991dbd772fd", "start_char": 0, "end_char": 1255, "text_sha256": "232795a0a16f2f2445cd43c34e4542fb2470eefb41f72fa9dc655991dbd772fd"}

experimental_model

Structural, biochemical, cellular, physiological and human genetic experiments

exposure

Glycerol binding and glycerol-pocket disruption

limitations

Published 2026; model-specific thermogenesis and mineralization findings do not establish a dietary glycerol or creatine treatment for bone disease.

nutrient_topic

Creatine research collection; topical membership is not evidence of a direct dietary effect. · Creatine

organism

TNAP experimental systems, mice and human variant analyses

plain_language

A shared protein connects the fat-energy pathway to bone biology; this is not evidence that creatine repairs those variants.

primary_references

[creatine-p42020733] Glycerol-driven TNAP activation in thermogenesis and mineralization. (2026). https://pubmed.ncbi.nlm.nih.gov/42020733/ DOI: 10.1038/s41586-026-10396-9

tissue_or_cell_type

Thermogenic adipocytes, osteoblasts and purified protein

trigger_kind

machinery_impairment Imported condition classification; unverified.

Creatine: synthesis, transport, phosphocreatine energetics and nutrient interactions (2026-09-17) · lines 568–579

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Structural, biochemical, cellular, physiological and human genetic experiments · source_derived_draft · unverified_draft

### creatine-tnap-pocket-bone Human missense variants in the glycerol pocket reduced TNAP-dependent mineralization in vitro and were associated with lower alkaline phosphatase activity and bone mineral density. Condition category: machinery_impairment nutrient_topic: Creatine research collection; topical membership is not evidence of a direct dietary effect. plain_language: A shared protein connects the fat-energy pathway to bone biology; this is not evidence that creatine repairs those variants. organism: TNAP experimental systems, mice and human variant analyses tissue_or_cell_type: Thermogenic adipocytes, osteoblasts and purified protein experimental_model: Structural, biochemical, cellular, physiological and human genetic experiments limitations: Published 2026; model-specific thermogenesis and mineralization findings do not establish a dietary glycerol or creatine treatment for bone disease. exposure: Glycerol binding and glycerol-pocket disruption evidence_span: {"source_cache": "artifacts/creatine-research/42020733.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "232795a0a16f2f2445cd43c34e4542fb2470eefb41f72fa9dc655991dbd772fd", "start_char": 0, "end_char": 1255, "text_sha256": "232795a0a16f2f2445cd43c34e4542fb2470eefb41f72fa9dc655991dbd772fd"} [creatine-p42020733] Glycerol-driven TNAP activation in thermogenesis and mineralization. (2026). https://pubmed.ncbi.nlm.nih.gov/42020733/ DOI: 10.1038/s41586-026-10396-9

evidence_span

{"source_cache": "artifacts/creatine-research/42020733.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "232795a0a16f2f2445cd43c34e4542fb2470eefb41f72fa9dc655991dbd772fd", "start_char": 0, "end_char": 1255, "text_sha256": "232795a0a16f2f2445cd43c34e4542fb2470eefb41f72fa9dc655991dbd772fd"}

experimental_model

Structural, biochemical, cellular, physiological and human genetic experiments

exposure

Glycerol binding and glycerol-pocket disruption

limitations

Published 2026; model-specific thermogenesis and mineralization findings do not establish a dietary glycerol or creatine treatment for bone disease.

nutrient_topic

Creatine research collection; topical membership is not evidence of a direct dietary effect. · Creatine

organism

TNAP experimental systems, mice and human variant analyses

plain_language

The same phosphatase needs a regulatory pocket to support this heat-producing pathway.

primary_references

[creatine-p42020733] Glycerol-driven TNAP activation in thermogenesis and mineralization. (2026). https://pubmed.ncbi.nlm.nih.gov/42020733/ DOI: 10.1038/s41586-026-10396-9

tissue_or_cell_type

Thermogenic adipocytes, osteoblasts and purified protein

Creatine: synthesis, transport, phosphocreatine energetics and nutrient interactions (2026-09-17) · lines 555–566

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Structural, biochemical, cellular, physiological and human genetic experiments · source_derived_draft · unverified_draft

### creatine-tnap-pocket-thermogenesis The TNAP glycerol pocket was required for TNAP-driven thermogenesis through the futile creatine cycle in the tested systems. Condition category: normal nutrient_topic: Creatine research collection; topical membership is not evidence of a direct dietary effect. plain_language: The same phosphatase needs a regulatory pocket to support this heat-producing pathway. organism: TNAP experimental systems, mice and human variant analyses tissue_or_cell_type: Thermogenic adipocytes, osteoblasts and purified protein experimental_model: Structural, biochemical, cellular, physiological and human genetic experiments limitations: Published 2026; model-specific thermogenesis and mineralization findings do not establish a dietary glycerol or creatine treatment for bone disease. exposure: Glycerol binding and glycerol-pocket disruption evidence_span: {"source_cache": "artifacts/creatine-research/42020733.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "232795a0a16f2f2445cd43c34e4542fb2470eefb41f72fa9dc655991dbd772fd", "start_char": 0, "end_char": 1255, "text_sha256": "232795a0a16f2f2445cd43c34e4542fb2470eefb41f72fa9dc655991dbd772fd"} [creatine-p42020733] Glycerol-driven TNAP activation in thermogenesis and mineralization. (2026). https://pubmed.ncbi.nlm.nih.gov/42020733/ DOI: 10.1038/s41586-026-10396-9

cross_nutrient

Calcium/Zn/Mg interaction depends on site occupancy and local conditions.

experimental_model

Purified TNAP concentration/pH experiment. Activity was measured using artificial pNPP substrate.

limitations

Local experimental concentrations cannot be converted to dietary dose cutoffs. This assay does not quantify physiological pyrophosphate turnover or mineral deposition.

nutrient_topic

Magnesium research collection; topical membership is not evidence of a direct dietary effect. · Magnesium

organism

Homo sapiens

plain_language

The same calcium ion can activate one site and interfere with another.

primary_references

[mg-hoylaerts2015] Functional significance of calcium binding to tissue-nonspecific alkaline phosphatase (2015). https://pubmed.ncbi.nlm.nih.gov/25775211/ DOI: 10.1371/journal.pone.0119874

tissue_or_cell_type

Recombinant human TNAP; cell-free p-nitrophenyl phosphate (pNPP) hydrolysis assay

Magnesium: cross-nutrient mechanisms and deficiency (2026-09-17) · lines 1491–1501

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Purified TNAP concentration/pH experiment. Activity was measured using artificial pNPP substrate. · source_derived_draft · unverified_draft

### mg-alpl-high-calcium-zinc-displacement Very high calcium displaced or competed with Zn at TNAP M1/M2 sites and reduced activity; concentrations depended on pH. Condition category: normal nutrient_topic: Magnesium research collection; topical membership is not evidence of a direct dietary effect. plain_language: The same calcium ion can activate one site and interfere with another. organism: Homo sapiens tissue_or_cell_type: Recombinant human TNAP; cell-free p-nitrophenyl phosphate (pNPP) hydrolysis assay experimental_model: Purified TNAP concentration/pH experiment. Activity was measured using artificial pNPP substrate. limitations: Local experimental concentrations cannot be converted to dietary dose cutoffs. This assay does not quantify physiological pyrophosphate turnover or mineral deposition. cross_nutrient: Calcium/Zn/Mg interaction depends on site occupancy and local conditions. [mg-hoylaerts2015] Functional significance of calcium binding to tissue-nonspecific alkaline phosphatase (2015). https://pubmed.ncbi.nlm.nih.gov/25775211/ DOI: 10.1371/journal.pone.0119874

cross_nutrient

Magnesium + zinc -> ALPL; connects to calcium/phosphate mineralization.

experimental_model

Recombinant TNAP metal-reconstitution assay. Activity was measured using artificial pNPP substrate.

limitations

Not an oral supplementation synergy trial. This assay does not quantify physiological pyrophosphate turnover or mineral deposition.

nutrient_topic

Magnesium research collection; topical membership is not evidence of a direct dietary effect. · Magnesium

organism

Homo sapiens

plain_language

This mineralization enzyme needs the right metals in different sites.

primary_references

[mg-hoylaerts2015] Functional significance of calcium binding to tissue-nonspecific alkaline phosphatase (2015). https://pubmed.ncbi.nlm.nih.gov/25775211/ DOI: 10.1371/journal.pone.0119874

tissue_or_cell_type

Recombinant human TNAP; cell-free p-nitrophenyl phosphate (pNPP) hydrolysis assay

Magnesium: cross-nutrient mechanisms and deficiency (2026-09-17) · lines 1467–1477

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Recombinant TNAP metal-reconstitution assay. Activity was measured using artificial pNPP substrate. · source_derived_draft · unverified_draft

### mg-zinc-alpl-reconstitution Combined Mg and Zn reconstituted demetalated TNAP activity; neither metal alone restored the same activity. Condition category: normal nutrient_topic: Magnesium research collection; topical membership is not evidence of a direct dietary effect. plain_language: This mineralization enzyme needs the right metals in different sites. organism: Homo sapiens tissue_or_cell_type: Recombinant human TNAP; cell-free p-nitrophenyl phosphate (pNPP) hydrolysis assay experimental_model: Recombinant TNAP metal-reconstitution assay. Activity was measured using artificial pNPP substrate. limitations: Not an oral supplementation synergy trial. This assay does not quantify physiological pyrophosphate turnover or mineral deposition. cross_nutrient: Magnesium + zinc -> ALPL; connects to calcium/phosphate mineralization. [mg-hoylaerts2015] Functional significance of calcium binding to tissue-nonspecific alkaline phosphatase (2015). https://pubmed.ncbi.nlm.nih.gov/25775211/ DOI: 10.1371/journal.pone.0119874

availability_state

machinery_impairment Imported condition classification; unverified.

evidence_location

Indexed abstract: intact/disrupted cells, PI-PLC and patient enzyme activity

experimental_model

Normal and hypophosphatasia human skin fibroblasts.

exposure

Patient versus control fibroblast enzyme assays.

limitations

Not an intake-deficiency experiment.

nutrient_topic

Vitamin B6 research collection; topical membership is not evidence of a direct dietary effect. · Vitamin B6

organism

Homo sapiens

plain_language

A handling defect limits extracellular PLP processing.

primary_references

[fedde1990] Alkaline phosphatase (tissue-nonspecific isoenzyme) is a phosphoethanolamine and pyridoxal-5'-phosphate ectophosphatase: normal and hypophosphatasia fibroblast study. (1990). https://pubmed.ncbi.nlm.nih.gov/2220817/

tissue_or_cell_type

Skin fibroblasts

trigger_kind

machinery_impairment Imported condition classification; unverified.

Vitamin B6: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 322–333

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Normal and hypophosphatasia human skin fibroblasts. · source_derived_draft · unverified_draft

### b6-transport-alpl-impaired Hypophosphatasia fibroblasts retained only 2-5% of control phosphatase activity toward PLP and other tested substrates. Condition category: machinery_impairment nutrient_topic: Vitamin B6 research collection; topical membership is not evidence of a direct dietary effect. plain_language: A handling defect limits extracellular PLP processing. organism: Homo sapiens tissue_or_cell_type: Skin fibroblasts experimental_model: Normal and hypophosphatasia human skin fibroblasts. limitations: Not an intake-deficiency experiment. exposure: Patient versus control fibroblast enzyme assays. evidence_location: Indexed abstract: intact/disrupted cells, PI-PLC and patient enzyme activity [fedde1990] Alkaline phosphatase (tissue-nonspecific isoenzyme) is a phosphoethanolamine and pyridoxal-5'-phosphate ectophosphatase: normal and hypophosphatasia fibroblast study. (1990). https://pubmed.ncbi.nlm.nih.gov/2220817/

availability_state

machinery_impairment Imported condition classification; unverified.

experimental_model

Phospho1/Alpl double-null embryos

limitations

Severe genetic disruption is not equivalent to low dietary calcium; isolated exceptions and developmental timing matter.

nutrient_topic

Calcium research collection; topical membership is not evidence of a direct dietary effect. · Calcium

organism

Mus musculus

plain_language

These phosphate-handling enzymes provide complementary support for mineral formation.

primary_references

[yadav2011] Loss of skeletal mineralization by the simultaneous ablation of PHOSPHO1 and alkaline phosphatase function: a unified model of the mechanisms of initiation of skeletal calcification (2011). https://pubmed.ncbi.nlm.nih.gov/20684022/ DOI: 10.1002/jbmr.195

tissue_or_cell_type

Developing skeleton

trigger_kind

machinery_impairment Imported condition classification; unverified.

Calcium: mechanism-first literature curation (2026-09-17) · lines 954–963

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Phospho1/Alpl double-null embryos · source_derived_draft · unverified_draft

### phospho1-alpl-double-loss-mineralization Combined loss of PHOSPHO1 and ALPL prevented skeletal mineralization in the reported double-null mouse embryos. Condition category: machinery_impairment nutrient_topic: Calcium research collection; topical membership is not evidence of a direct dietary effect. plain_language: These phosphate-handling enzymes provide complementary support for mineral formation. organism: Mus musculus tissue_or_cell_type: Developing skeleton experimental_model: Phospho1/Alpl double-null embryos limitations: Severe genetic disruption is not equivalent to low dietary calcium; isolated exceptions and developmental timing matter. [yadav2011] Loss of skeletal mineralization by the simultaneous ablation of PHOSPHO1 and alkaline phosphatase function: a unified model of the mechanisms of initiation of skeletal calcification (2011). https://pubmed.ncbi.nlm.nih.gov/20684022/ DOI: 10.1002/jbmr.195

evidence_span

{"source_cache": "artifacts/creatine-research/42020733.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "232795a0a16f2f2445cd43c34e4542fb2470eefb41f72fa9dc655991dbd772fd", "start_char": 0, "end_char": 1255, "text_sha256": "232795a0a16f2f2445cd43c34e4542fb2470eefb41f72fa9dc655991dbd772fd"}

experimental_model

Structural, biochemical, cellular, physiological and human genetic experiments

exposure

Glycerol binding and glycerol-pocket disruption

limitations

Published 2026; model-specific thermogenesis and mineralization findings do not establish a dietary glycerol or creatine treatment for bone disease.

nutrient_topic

Creatine research collection; topical membership is not evidence of a direct dietary effect. · Creatine

organism

TNAP experimental systems, mice and human variant analyses

plain_language

A molecule made during fat breakdown can adjust the phosphatase that participates in creatine cycling.

primary_references

[creatine-p42020733] Glycerol-driven TNAP activation in thermogenesis and mineralization. (2026). https://pubmed.ncbi.nlm.nih.gov/42020733/ DOI: 10.1038/s41586-026-10396-9

tissue_or_cell_type

Thermogenic adipocytes, osteoblasts and purified protein

Creatine: synthesis, transport, phosphocreatine energetics and nutrient interactions (2026-09-17) · lines 542–553

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Structural, biochemical, cellular, physiological and human genetic experiments · source_derived_draft · unverified_draft

### creatine-glycerol-tnap Glycerol bound a TNAP surface pocket distant from the active site and enhanced TNAP activity. Condition category: normal nutrient_topic: Creatine research collection; topical membership is not evidence of a direct dietary effect. plain_language: A molecule made during fat breakdown can adjust the phosphatase that participates in creatine cycling. organism: TNAP experimental systems, mice and human variant analyses tissue_or_cell_type: Thermogenic adipocytes, osteoblasts and purified protein experimental_model: Structural, biochemical, cellular, physiological and human genetic experiments limitations: Published 2026; model-specific thermogenesis and mineralization findings do not establish a dietary glycerol or creatine treatment for bone disease. exposure: Glycerol binding and glycerol-pocket disruption evidence_span: {"source_cache": "artifacts/creatine-research/42020733.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "232795a0a16f2f2445cd43c34e4542fb2470eefb41f72fa9dc655991dbd772fd", "start_char": 0, "end_char": 1255, "text_sha256": "232795a0a16f2f2445cd43c34e4542fb2470eefb41f72fa9dc655991dbd772fd"} [creatine-p42020733] Glycerol-driven TNAP activation in thermogenesis and mineralization. (2026). https://pubmed.ncbi.nlm.nih.gov/42020733/ DOI: 10.1038/s41586-026-10396-9

cross_nutrient

true

experimental_model

Recombinant human TNAP and M4 mutants; cell-free enzyme activity and metal reconstitution

exposure

Recombinant TNAP M4-site mutants and metal-dependent activity comparisons at pH 7.4 and 9.8.

limitations

This record states the authors’ mechanistic interpretation; existing M3 calcium substitution and Mg/Zn reconstitution claims remain unchanged. It does not imply dietary calcium is a zinc substitute.

nutrient_topic

Zinc research collection; topical membership is not evidence of a direct dietary effect. · Zinc

organism

Homo sapiens

plain_language

TNAP metal sites do different jobs: its peripheral calcium site was interpreted as structural.

primary_references

[zinc-enz-tnap-metals2015] Functional significance of calcium binding to tissue-nonspecific alkaline phosphatase. (2015). https://pubmed.ncbi.nlm.nih.gov/25775211/ DOI: 10.1371/journal.pone.0119874

tissue_or_cell_type

Purified protein; cell-free assay

Zinc: transport, enzyme loading, deficiency and nutrient interactions (2026-09-17) · lines 820–831

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Recombinant human TNAP and M4 mutants; cell-free enzyme activity and metal reconstitution · source_derived_draft · unverified_draft

### zinc-enz-tnap-m4-not-catalytic The recombinant TNAP mutant study attributed effects of disrupting calcium site M4 to protein structure rather than direct catalysis by M4-bound calcium. Condition category: normal nutrient_topic: Zinc research collection; topical membership is not evidence of a direct dietary effect. plain_language: TNAP metal sites do different jobs: its peripheral calcium site was interpreted as structural. organism: Homo sapiens tissue_or_cell_type: Purified protein; cell-free assay experimental_model: Recombinant human TNAP and M4 mutants; cell-free enzyme activity and metal reconstitution limitations: This record states the authors’ mechanistic interpretation; existing M3 calcium substitution and Mg/Zn reconstitution claims remain unchanged. It does not imply dietary calcium is a zinc substitute. exposure: Recombinant TNAP M4-site mutants and metal-dependent activity comparisons at pH 7.4 and 9.8. cross_nutrient: true [zinc-enz-tnap-metals2015] Functional significance of calcium binding to tissue-nonspecific alkaline phosphatase. (2015). https://pubmed.ncbi.nlm.nih.gov/25775211/ DOI: 10.1371/journal.pone.0119874

availability_state

machinery_impairment Imported condition classification; unverified.

cross_nutrient

false

experimental_model

Engineered chicken DT40 cells with ZnT gene disruption and transporter re-expression; TNAP activation

exposure

Genetic deficiency of the two specific secretory ZnT complexes, followed by zinc supplementation in culture; amount unreported in abstract.

limitations

Primary abstract-level evidence in engineered chicken DT40 cells with transporter complementation. Not a human dietary deficiency or supplementation trial; assay exposure amounts and mutant-specific residue effects are not inferred.

nutrient_topic

Zinc research collection; topical membership is not evidence of a direct dietary effect. · Zinc

organism

Gallus gallus

plain_language

More available zinc did not bypass missing enzyme-loading machinery.

primary_references

[zinc-enz-znt-tnap2011] Tissue nonspecific alkaline phosphatase is activated via a two-step mechanism by zinc transport complexes in the early secretory pathway. (2011). https://pubmed.ncbi.nlm.nih.gov/21402707/ DOI: 10.1074/jbc.m111.227173

tissue_or_cell_type

Chicken DT40 early secretory pathway

trigger_kind

machinery_impairment Imported condition classification; unverified.

Zinc: transport, enzyme loading, deficiency and nutrient interactions (2026-09-17) · lines 781–792

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Engineered chicken DT40 cells with ZnT gene disruption and transporter re-expression; TNAP activation · source_derived_draft · unverified_draft

### zinc-enz-zinc-cannot-bypass-znt-loss Extracellular zinc supplementation did not restore reduced TNAP activity in DT40 cells deficient in both ZnT5-ZnT6 and ZnT7 complexes. Condition category: machinery_impairment nutrient_topic: Zinc research collection; topical membership is not evidence of a direct dietary effect. plain_language: More available zinc did not bypass missing enzyme-loading machinery. organism: Gallus gallus tissue_or_cell_type: Chicken DT40 early secretory pathway experimental_model: Engineered chicken DT40 cells with ZnT gene disruption and transporter re-expression; TNAP activation limitations: Primary abstract-level evidence in engineered chicken DT40 cells with transporter complementation. Not a human dietary deficiency or supplementation trial; assay exposure amounts and mutant-specific residue effects are not inferred. exposure: Genetic deficiency of the two specific secretory ZnT complexes, followed by zinc supplementation in culture; amount unreported in abstract. cross_nutrient: false [zinc-enz-znt-tnap2011] Tissue nonspecific alkaline phosphatase is activated via a two-step mechanism by zinc transport complexes in the early secretory pathway. (2011). https://pubmed.ncbi.nlm.nih.gov/21402707/ DOI: 10.1074/jbc.m111.227173

availability_state

machinery_impairment Imported condition classification; unverified.

cross_nutrient

false

experimental_model

Engineered chicken DT40 cells with ZnT gene disruption and transporter re-expression; TNAP activation

exposure

Transport-incompetent ZnT5 variant with ZnT6, compared with functional loading machinery.

limitations

Primary abstract-level evidence in engineered chicken DT40 cells with transporter complementation. Not a human dietary deficiency or supplementation trial; assay exposure amounts and mutant-specific residue effects are not inferred.

nutrient_topic

Zinc research collection; topical membership is not evidence of a direct dietary effect. · Zinc

organism

Gallus gallus cell model with human proteins

plain_language

Protecting the enzyme protein is insufficient when the complex cannot deliver zinc.

primary_references

[zinc-enz-znt-tnap2011] Tissue nonspecific alkaline phosphatase is activated via a two-step mechanism by zinc transport complexes in the early secretory pathway. (2011). https://pubmed.ncbi.nlm.nih.gov/21402707/ DOI: 10.1074/jbc.m111.227173

tissue_or_cell_type

Chicken DT40 early secretory pathway

trigger_kind

machinery_impairment Imported condition classification; unverified.

Zinc: transport, enzyme loading, deficiency and nutrient interactions (2026-09-17) · lines 807–818

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Engineered chicken DT40 cells with ZnT gene disruption and transporter re-expression; TNAP activation · source_derived_draft · unverified_draft

### zinc-enz-znt-mutant-no-activity Reconstitution of ZnT5-ZnT6 with transport-incompetent ZnT5 did not restore TNAP activity. Condition category: machinery_impairment nutrient_topic: Zinc research collection; topical membership is not evidence of a direct dietary effect. plain_language: Protecting the enzyme protein is insufficient when the complex cannot deliver zinc. organism: Gallus gallus cell model with human proteins tissue_or_cell_type: Chicken DT40 early secretory pathway experimental_model: Engineered chicken DT40 cells with ZnT gene disruption and transporter re-expression; TNAP activation limitations: Primary abstract-level evidence in engineered chicken DT40 cells with transporter complementation. Not a human dietary deficiency or supplementation trial; assay exposure amounts and mutant-specific residue effects are not inferred. exposure: Transport-incompetent ZnT5 variant with ZnT6, compared with functional loading machinery. cross_nutrient: false [zinc-enz-znt-tnap2011] Tissue nonspecific alkaline phosphatase is activated via a two-step mechanism by zinc transport complexes in the early secretory pathway. (2011). https://pubmed.ncbi.nlm.nih.gov/21402707/ DOI: 10.1074/jbc.m111.227173

availability_state

machinery_impairment Imported condition classification; unverified.

cross_nutrient

false

experimental_model

Engineered chicken DT40 cells with ZnT gene disruption and transporter re-expression; TNAP activation

exposure

Transport-incompetent ZnT5 variant reconstituted with ZnT6 in DT40 cells.

limitations

Primary abstract-level evidence in engineered chicken DT40 cells with transporter complementation. Not a human dietary deficiency or supplementation trial; assay exposure amounts and mutant-specific residue effects are not inferred.

nutrient_topic

Zinc research collection; topical membership is not evidence of a direct dietary effect. · Zinc

organism

Gallus gallus cell model with human proteins

plain_language

The transporter complex can protect the unfinished protein even when zinc transport fails.

primary_references

[zinc-enz-znt-tnap2011] Tissue nonspecific alkaline phosphatase is activated via a two-step mechanism by zinc transport complexes in the early secretory pathway. (2011). https://pubmed.ncbi.nlm.nih.gov/21402707/ DOI: 10.1074/jbc.m111.227173

tissue_or_cell_type

Chicken DT40 early secretory pathway; human transporter complementation

trigger_kind

machinery_impairment Imported condition classification; unverified.

Zinc: transport, enzyme loading, deficiency and nutrient interactions (2026-09-17) · lines 794–805

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Engineered chicken DT40 cells with ZnT gene disruption and transporter re-expression; TNAP activation · source_derived_draft · unverified_draft

### zinc-enz-znt-mutant-stabilizes A transport-incompetent ZnT5 variant expressed with ZnT6 stabilized TNAP protein as the apo form despite failing to restore enzyme activity. Condition category: machinery_impairment nutrient_topic: Zinc research collection; topical membership is not evidence of a direct dietary effect. plain_language: The transporter complex can protect the unfinished protein even when zinc transport fails. organism: Gallus gallus cell model with human proteins tissue_or_cell_type: Chicken DT40 early secretory pathway; human transporter complementation experimental_model: Engineered chicken DT40 cells with ZnT gene disruption and transporter re-expression; TNAP activation limitations: Primary abstract-level evidence in engineered chicken DT40 cells with transporter complementation. Not a human dietary deficiency or supplementation trial; assay exposure amounts and mutant-specific residue effects are not inferred. exposure: Transport-incompetent ZnT5 variant reconstituted with ZnT6 in DT40 cells. cross_nutrient: false [zinc-enz-znt-tnap2011] Tissue nonspecific alkaline phosphatase is activated via a two-step mechanism by zinc transport complexes in the early secretory pathway. (2011). https://pubmed.ncbi.nlm.nih.gov/21402707/ DOI: 10.1074/jbc.m111.227173

cross_nutrient

false

experimental_model

Engineered chicken DT40 cells with ZnT gene disruption and transporter re-expression; TNAP activation

exposure

ZnT gene disruption and transporter re-expression comparisons.

limitations

Primary abstract-level evidence in engineered chicken DT40 cells with transporter complementation. Not a human dietary deficiency or supplementation trial; assay exposure amounts and mutant-specific residue effects are not inferred.

nutrient_topic

Zinc research collection; topical membership is not evidence of a direct dietary effect. · Zinc

organism

Gallus gallus cell model with human proteins

plain_language

Specific transporter complexes deliver zinc while TNAP matures.

primary_references

[zinc-enz-znt-tnap2011] Tissue nonspecific alkaline phosphatase is activated via a two-step mechanism by zinc transport complexes in the early secretory pathway. (2011). https://pubmed.ncbi.nlm.nih.gov/21402707/ DOI: 10.1074/jbc.m111.227173

tissue_or_cell_type

Chicken DT40 early secretory pathway; human transporter complementation

Zinc: transport, enzyme loading, deficiency and nutrient interactions (2026-09-17) · lines 768–779

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Engineered chicken DT40 cells with ZnT gene disruption and transporter re-expression; TNAP activation · source_derived_draft · unverified_draft

### zinc-enz-znt-specific-maturation The ZnT5-ZnT6 and ZnT7 complexes support TNAP conversion from apoenzyme to zinc-loaded active enzyme in the early secretory pathway. Condition category: normal nutrient_topic: Zinc research collection; topical membership is not evidence of a direct dietary effect. plain_language: Specific transporter complexes deliver zinc while TNAP matures. organism: Gallus gallus cell model with human proteins tissue_or_cell_type: Chicken DT40 early secretory pathway; human transporter complementation experimental_model: Engineered chicken DT40 cells with ZnT gene disruption and transporter re-expression; TNAP activation limitations: Primary abstract-level evidence in engineered chicken DT40 cells with transporter complementation. Not a human dietary deficiency or supplementation trial; assay exposure amounts and mutant-specific residue effects are not inferred. exposure: ZnT gene disruption and transporter re-expression comparisons. cross_nutrient: false [zinc-enz-znt-tnap2011] Tissue nonspecific alkaline phosphatase is activated via a two-step mechanism by zinc transport complexes in the early secretory pathway. (2011). https://pubmed.ncbi.nlm.nih.gov/21402707/ DOI: 10.1074/jbc.m111.227173

cross_nutrient

Vitamin A -> shared ALPL node already linked to zinc, magnesium and calcium.

experimental_model

Same culture experiments.

limitations

Parallel marker changes do not prove each mediates the mineralization loss.

nutrient_topic

Vitamin A research collection; topical membership is not evidence of a direct dietary effect. · Vitamin A

organism

Homo sapiens; Mus musculus

plain_language

Several components of the bone-building program changed together.

primary_references

[va-lind2013] Vitamin a is a negative regulator of osteoblast mineralization (2013). https://pubmed.ncbi.nlm.nih.gov/24340023/ DOI: 10.1371/journal.pone.0082388

tissue_or_cell_type

Osteoblasts

Vitamin A: forms, mechanisms, deficiency and excess (2026-09-17) · lines 1662–1672

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Same culture experiments. · source_derived_draft · unverified_draft

### va-retinoic-acid-osteoblast-markers RA-treated osteoblasts had reduced alkaline phosphatase and osteocalcin, with lower RUNX2/SP7 protein and PHEX expression. Condition category: normal nutrient_topic: Vitamin A research collection; topical membership is not evidence of a direct dietary effect. plain_language: Several components of the bone-building program changed together. organism: Homo sapiens; Mus musculus tissue_or_cell_type: Osteoblasts experimental_model: Same culture experiments. limitations: Parallel marker changes do not prove each mediates the mineralization loss. cross_nutrient: Vitamin A -> shared ALPL node already linked to zinc, magnesium and calcium. [va-lind2013] Vitamin a is a negative regulator of osteoblast mineralization (2013). https://pubmed.ncbi.nlm.nih.gov/24340023/ DOI: 10.1371/journal.pone.0082388

cross_nutrient

Calcium/Mg substitution at one enzyme site, not whole-body interchangeability.

experimental_model

Recombinant enzyme comparison. Activity was measured using artificial pNPP substrate.

limitations

Site-specific substitution is not evidence that dietary calcium replaces magnesium requirements. This assay does not quantify physiological pyrophosphate turnover or mineral deposition.

nutrient_topic

Magnesium research collection; topical membership is not evidence of a direct dietary effect. · Magnesium

organism

Homo sapiens

plain_language

Calcium can occupy this magnesium site, but gives a different enzyme response.

primary_references

[mg-hoylaerts2015] Functional significance of calcium binding to tissue-nonspecific alkaline phosphatase (2015). https://pubmed.ncbi.nlm.nih.gov/25775211/ DOI: 10.1371/journal.pone.0119874

tissue_or_cell_type

Recombinant human TNAP; cell-free p-nitrophenyl phosphate (pNPP) hydrolysis assay

Magnesium: cross-nutrient mechanisms and deficiency (2026-09-17) · lines 1479–1489

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Recombinant enzyme comparison. Activity was measured using artificial pNPP substrate. · source_derived_draft · unverified_draft

### mg-alpl-calcium-partial-substitution Calcium at TNAP site M3 supported about 40% of the activity of Mg/Zn-TNAP at pH 7.4 and 9.8. Condition category: normal nutrient_topic: Magnesium research collection; topical membership is not evidence of a direct dietary effect. plain_language: Calcium can occupy this magnesium site, but gives a different enzyme response. organism: Homo sapiens tissue_or_cell_type: Recombinant human TNAP; cell-free p-nitrophenyl phosphate (pNPP) hydrolysis assay experimental_model: Recombinant enzyme comparison. Activity was measured using artificial pNPP substrate. limitations: Site-specific substitution is not evidence that dietary calcium replaces magnesium requirements. This assay does not quantify physiological pyrophosphate turnover or mineral deposition. cross_nutrient: Calcium/Mg substitution at one enzyme site, not whole-body interchangeability. [mg-hoylaerts2015] Functional significance of calcium binding to tissue-nonspecific alkaline phosphatase (2015). https://pubmed.ncbi.nlm.nih.gov/25775211/ DOI: 10.1371/journal.pone.0119874

compartment_description

Extracellular matrix and vesicle surface

experimental_model

Genetic and ex vivo pyrophosphate/mineralization experiments

limitations

Pi and PPi labels pool protonation states; this is not evidence that calcium activates TNAP.

nutrient_topic

Calcium research collection; topical membership is not evidence of a direct dietary effect. · Calcium

organism

Mus musculus

plain_language

TNAP removes a local brake on calcium phosphate crystal growth.

primary_references

[hessle2002] Tissue-nonspecific alkaline phosphatase and plasma cell membrane glycoprotein-1 are central antagonistic regulators of bone mineralization (2002). https://pmc.ncbi.nlm.nih.gov/articles/PMC123160/ DOI: 10.1073/pnas.142063399

tissue_or_cell_type

Osteoblast matrix and matrix vesicles

Calcium: mechanism-first literature curation (2026-09-17) · lines 931–941

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Genetic and ex vivo pyrophosphate/mineralization experiments · source_derived_draft · unverified_draft

### alpl-pyrophosphate-hydrolysis ALPL/TNAP hydrolyzes extracellular pyrophosphate to inorganic phosphate, reducing an inhibitor of matrix mineralization. Condition category: normal nutrient_topic: Calcium research collection; topical membership is not evidence of a direct dietary effect. plain_language: TNAP removes a local brake on calcium phosphate crystal growth. organism: Mus musculus tissue_or_cell_type: Osteoblast matrix and matrix vesicles experimental_model: Genetic and ex vivo pyrophosphate/mineralization experiments limitations: Pi and PPi labels pool protonation states; this is not evidence that calcium activates TNAP. compartment_description: Extracellular matrix and vesicle surface [hessle2002] Tissue-nonspecific alkaline phosphatase and plasma cell membrane glycoprotein-1 are central antagonistic regulators of bone mineralization (2002). https://pmc.ncbi.nlm.nih.gov/articles/PMC123160/ DOI: 10.1073/pnas.142063399

availability_state

machinery_impairment Imported condition classification; unverified.

experimental_model

Phospho1-null and Phospho1-null/Alpl-heterozygous mice

limitations

A developmental machinery defect; it does not establish dietary calcium deficiency as its cause.

nutrient_topic

Calcium research collection; topical membership is not evidence of a direct dietary effect. · Calcium

organism

Mus musculus

plain_language

Tooth dentin depends on mineral-processing enzymes as well as mineral supply.

primary_references

[mckee2013] Compounded PHOSPHO1/ALPL deficiencies reduce dentin mineralization (2013). https://pmc.ncbi.nlm.nih.gov/articles/PMC3711567/ DOI: 10.1177/0022034513490958

tissue_or_cell_type

Incisor dentin and odontoblast-associated vesicles

trigger_kind

machinery_impairment Imported condition classification; unverified.

Calcium: mechanism-first literature curation (2026-09-17) · lines 965–974

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Phospho1-null and Phospho1-null/Alpl-heterozygous mice · source_derived_draft · unverified_draft

### phospho1-loss-reduces-dentin-mineralization Phospho1-null mouse incisors were hypomineralized, with a further defect after loss of one Alpl allele. Condition category: machinery_impairment nutrient_topic: Calcium research collection; topical membership is not evidence of a direct dietary effect. plain_language: Tooth dentin depends on mineral-processing enzymes as well as mineral supply. organism: Mus musculus tissue_or_cell_type: Incisor dentin and odontoblast-associated vesicles experimental_model: Phospho1-null and Phospho1-null/Alpl-heterozygous mice limitations: A developmental machinery defect; it does not establish dietary calcium deficiency as its cause. [mckee2013] Compounded PHOSPHO1/ALPL deficiencies reduce dentin mineralization (2013). https://pmc.ncbi.nlm.nih.gov/articles/PMC3711567/ DOI: 10.1177/0022034513490958

availability_state

machinery_impairment Imported condition classification; unverified.

experimental_model

Single versus combined Alpl/Enpp1 knockout

limitations

The genetic rescue supports local PPi control; it is not a calcium-supplement experiment.

nutrient_topic

Calcium research collection; topical membership is not evidence of a direct dietary effect. · Calcium

organism

Mus musculus

plain_language

Mineral formation depends on controlling an inhibitor as well as supplying calcium.

primary_references

[hessle2002] Tissue-nonspecific alkaline phosphatase and plasma cell membrane glycoprotein-1 are central antagonistic regulators of bone mineralization (2002). https://pmc.ncbi.nlm.nih.gov/articles/PMC123160/ DOI: 10.1073/pnas.142063399

tissue_or_cell_type

Bone and cultured osteoblast matrix

trigger_kind

machinery_impairment Imported condition classification; unverified.

Calcium: mechanism-first literature curation (2026-09-17) · lines 943–952

AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Single versus combined Alpl/Enpp1 knockout · source_derived_draft · unverified_draft

### pyrophosphate-restrains-mineral-deposition In Alpl-deficient mice and osteoblast preparations, excess pyrophosphate accompanied poor mineralization; removing Enpp1 normalized pyrophosphate and improved mineral deposition. Condition category: machinery_impairment nutrient_topic: Calcium research collection; topical membership is not evidence of a direct dietary effect. plain_language: Mineral formation depends on controlling an inhibitor as well as supplying calcium. organism: Mus musculus tissue_or_cell_type: Bone and cultured osteoblast matrix experimental_model: Single versus combined Alpl/Enpp1 knockout limitations: The genetic rescue supports local PPi control; it is not a calcium-supplement experiment. [hessle2002] Tissue-nonspecific alkaline phosphatase and plasma cell membrane glycoprotein-1 are central antagonistic regulators of bone mineralization (2002). https://pmc.ncbi.nlm.nih.gov/articles/PMC123160/ DOI: 10.1073/pnas.142063399