Component
Hypertrophic chondrocyte
Terminally differentiated cartilage cell in the growth plate; the phosphate-responsive cell studied in rickets models.
2 recorded relationships. Experimental role, claim status and evidence remain attached to each record.
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.
Other things that act on it
Enzymes, hormones, genes, and other components with a recorded effect. These are not nutrients, so they do not count toward the arrows above. Each finding names the chapter that recorded it.
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.
Where it participates (unsigned role)
Phosphate exposure activated the caspase-9-dependent mitochondrial apoptotic pathway in cultured primary mouse hypertrophic chondrocytes.
Experimental context and source evidence
- cross_nutrient
- Vitamin D–calcium–phosphate regulation.
- evidence_locator
- Primary abstract and opening experimental-results summary; web-assay-excerpts.json
- evidence_scope
- D3 active metabolite or VDR machinery experiment; not a direct D2-versus-D3 comparison.
- experimental_model
- Primary mouse chondrocytes; caspase-9 pathway and apoptosis assays
- exposure
- Inorganic phosphate exposure in differentiated primary cultures; exact dose/time not recovered in the primary passages used.
- limitations
- Cell differentiation and exposure conditions matter; no nutrient dose recommendation, universal phosphate sensor or human serum threshold is established.
- 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
- Phosphate served as a signal for a cartilage-cell maturation pathway in this culture system.
- primary_references
- [vdm-sabbagh2005] Hypophosphatemia leads to rickets by impairing caspase-mediated apoptosis of hypertrophic chondrocytes. (2005). https://pubmed.ncbi.nlm.nih.gov/15976027/ DOI: 10.1073/pnas.0502249102
- tissue_or_cell_type
- Cultured hypertrophic chondrocytes
Vitamin D2 and D3: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 793–807
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Primary mouse chondrocytes; caspase-9 pathway and apoptosis assays · source_derived_draft · unverified_draft
### vdm-phosphate-activates-chondrocyte-caspase9 Phosphate exposure activated the caspase-9-dependent mitochondrial apoptotic pathway in cultured primary mouse hypertrophic chondrocytes. Condition category: normal nutrient_topic: Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. plain_language: Phosphate served as a signal for a cartilage-cell maturation pathway in this culture system. organism: Mus musculus tissue_or_cell_type: Cultured hypertrophic chondrocytes experimental_model: Primary mouse chondrocytes; caspase-9 pathway and apoptosis assays limitations: Cell differentiation and exposure conditions matter; no nutrient dose recommendation, universal phosphate sensor or human serum threshold is established. exposure: Inorganic phosphate exposure in differentiated primary cultures; exact dose/time not recovered in the primary passages used. cross_nutrient: Vitamin D–calcium–phosphate regulation. evidence_locator: Primary abstract and opening experimental-results summary; web-assay-excerpts.json nutrient: Vitamin D2 and D3 evidence_scope: D3 active metabolite or VDR machinery experiment; not a direct D2-versus-D3 comparison. [vdm-sabbagh2005] Hypophosphatemia leads to rickets by impairing caspase-mediated apoptosis of hypertrophic chondrocytes. (2005). https://pubmed.ncbi.nlm.nih.gov/15976027/ DOI: 10.1073/pnas.0502249102
Complete structured claim and evidenceDiet-induced hypophosphatemic mice had impaired late hypertrophic-chondrocyte apoptosis and rachitic growth-plate expansion despite hypercalcemia and suppressed PTH.
Experimental context and source evidence
- availability_state
- nutrient_deficiency Imported condition classification; unverified.
- cross_nutrient
- Vitamin D–calcium–phosphate regulation.
- evidence_locator
- Results: biochemical parameters, growth-plate histology and TUNEL; primary text excerpts cached in web-assay-excerpts.json
- evidence_scope
- D3 active metabolite or VDR machinery experiment; not a direct D2-versus-D3 comparison.
- experimental_model
- Wild-type mice fed high-calcium/low-phosphate diet; growth-plate histology and TUNEL assay
- exposure
- High-calcium/low-phosphate diet; biochemical comparisons at 24 days of age in Figure 2. Exact diet duration/formulation not resolved in retrieved passages.
- limitations
- The diet arm is separated from Vdr-null and Phex-mutant models. No single human serum threshold or claim that every rachitic disorder has one mechanism is inferred.
- 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
- Low phosphate disrupted maturation of growth-plate cartilage even when calcium was high.
- primary_references
- [vdm-sabbagh2005] Hypophosphatemia leads to rickets by impairing caspase-mediated apoptosis of hypertrophic chondrocytes. (2005). https://pubmed.ncbi.nlm.nih.gov/15976027/ DOI: 10.1073/pnas.0502249102
- tissue_or_cell_type
- Growth-plate hypertrophic chondrocytes
- trigger_kind
- nutrient_deficiency Imported condition classification; unverified.
Vitamin D2 and D3: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 777–791
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Wild-type mice fed high-calcium/low-phosphate diet; growth-plate histology and TUNEL assay · source_derived_draft · unverified_draft
### vdm-phosphate-restriction-reduces-growth-plate-apoptosis Diet-induced hypophosphatemic mice had impaired late hypertrophic-chondrocyte apoptosis and rachitic growth-plate expansion despite hypercalcemia and suppressed PTH. Condition category: nutrient_deficiency nutrient_topic: Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. plain_language: Low phosphate disrupted maturation of growth-plate cartilage even when calcium was high. organism: Mus musculus tissue_or_cell_type: Growth-plate hypertrophic chondrocytes experimental_model: Wild-type mice fed high-calcium/low-phosphate diet; growth-plate histology and TUNEL assay limitations: The diet arm is separated from Vdr-null and Phex-mutant models. No single human serum threshold or claim that every rachitic disorder has one mechanism is inferred. exposure: High-calcium/low-phosphate diet; biochemical comparisons at 24 days of age in Figure 2. Exact diet duration/formulation not resolved in retrieved passages. cross_nutrient: Vitamin D–calcium–phosphate regulation. evidence_locator: Results: biochemical parameters, growth-plate histology and TUNEL; primary text excerpts cached in web-assay-excerpts.json nutrient: Vitamin D2 and D3 evidence_scope: D3 active metabolite or VDR machinery experiment; not a direct D2-versus-D3 comparison. [vdm-sabbagh2005] Hypophosphatemia leads to rickets by impairing caspase-mediated apoptosis of hypertrophic chondrocytes. (2005). https://pubmed.ncbi.nlm.nih.gov/15976027/ DOI: 10.1073/pnas.0502249102
Complete structured claim and evidence
The events it takes part in
A mechanism often involves more than two components. These are the full events, with every participant and its role.
Situations it appears in
Low-supply and faulty-machinery situations recorded in the chapters where this component plays a part.
In the sources
Preserved passages that mention this component, quoted exactly. Open one to read it in context.
Open hypotheses
Proposed ideas that involve this component. They are labeled as hypotheses and do not change any recorded statement.
This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.