Component
Renal calcium reabsorption
Independent biological entity. Read linked claims for experimental scope and context.
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.
What acts on it
Trpv5-null mice have impaired distal calcium reabsorption and severe hypercalciuria despite increased vitamin D levels.
Experimental context and source evidence
- availability_state
- machinery_impairment Imported condition classification; unverified.
- experimental_model
- Trpv5 knockout mice; renal micropuncture and oral calcium tracer assays
- limitations
- Mouse knockout with micropuncture localization.
- nutrient_topic
- Calcium research collection; topical membership is not evidence of a direct dietary effect. · Calcium
- organism
- Mus musculus
- plain_language
- Hormonal compensation cannot replace the missing channel.
- primary_references
- [hoenderop2003] Renal Ca2+ wasting, hyperabsorption, and reduced bone thickness in mice lacking TRPV5 (2003). https://pmc.ncbi.nlm.nih.gov/articles/PMC297001/ DOI: 10.1172/JCI19826
- tissue_or_cell_type
- Early distal convolution
- trigger_kind
- machinery_impairment Imported condition classification; unverified.
Calcium: mechanism-first literature curation (2026-09-17) · lines 236–245
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Trpv5 knockout mice; renal micropuncture and oral calcium tracer assays · source_derived_draft · unverified_draft
### trpv5-loss-renal-reabsorption Trpv5-null mice have impaired distal calcium reabsorption and severe hypercalciuria despite increased vitamin D levels. Condition category: machinery_impairment nutrient_topic: Calcium research collection; topical membership is not evidence of a direct dietary effect. plain_language: Hormonal compensation cannot replace the missing channel. organism: Mus musculus tissue_or_cell_type: Early distal convolution experimental_model: Trpv5 knockout mice; renal micropuncture and oral calcium tracer assays limitations: Mouse knockout with micropuncture localization. [hoenderop2003] Renal Ca2+ wasting, hyperabsorption, and reduced bone thickness in mice lacking TRPV5 (2003). https://pmc.ncbi.nlm.nih.gov/articles/PMC297001/ DOI: 10.1172/JCI19826
Complete structured claim and evidenceCalcium reabsorption fell from 98.6% to 97.5%, with no significant change in filtered calcium load.
Experimental context and source evidence
- evidence_access
- Primary abstract
- experimental_model
- 37 women, age 31–78; decaffeinated beverage with or without caffeine 6 mg/kg lean body mass; two-hour urine collection.
- limitations
- Acute renal handling. The exact tubular mechanism was unresolved; no long-term deficiency, bone loss or replacement requirement measured.
- nutrient_topic
- Caffeine collection; salts, coffee, species and coexposure contexts retain their identities. · Caffeine
- plain_language
- The kidneys retained a smaller fraction of the filtered mineral.
- primary_references
- Effects of dietary caffeine on renal handling of minerals in adult women. · 1990 · https://pubmed.ncbi.nlm.nih.gov/2402180/ · DOI 10.1016/0024-3205(90)90616-y
Caffeine: receptors, metabolism, nutrient interactions, adaptation and discovery questions (2026-09-18) · lines 284–290
AI-assisted research curation; primary-abstract references and experimental limitations individually identified. Not publisher full text. · supports · 37 women, age 31–78; decaffeinated beverage with or without caffeine 6 mg/kg lean body mass; two-hour urine collection. · source_derived_draft · unverified_draft
## caf-renal-ca The kidneys retained a smaller fraction of the filtered mineral. Calcium reabsorption fell from 98.6% to 97.5%, with no significant change in filtered calcium load. Model: 37 women, age 31–78; decaffeinated beverage with or without caffeine 6 mg/kg lean body mass; two-hour urine collection. Limitations: Acute renal handling. The exact tubular mechanism was unresolved; no long-term deficiency, bone loss or replacement requirement measured. Evidence access: Primary abstract Effects of dietary caffeine on renal handling of minerals in adult women. · 1990 · https://pubmed.ncbi.nlm.nih.gov/2402180/ · DOI 10.1016/0024-3205(90)90616-y
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.