Component
Sodium-phosphate cotransporter NaPi-IIa / SLC34A1
Independent biological entity. Read linked claims for experimental scope and context.
3 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
Recombinant FGF23 reduced renal NaPi-IIa mRNA and protein abundance in the acute rodent injection study.
Experimental context and source evidence
- cross_nutrient
- Vitamin D–calcium–phosphate regulation.
- evidence_locator
- Abstract: reported experimental results
- evidence_scope
- D3 active metabolite or VDR machinery experiment; not a direct D2-versus-D3 comparison.
- experimental_model
- Single recombinant FGF23 injection in rodents; renal transcript/protein and serum phosphate measurements
- exposure
- Single recombinant FGF23 injection; serum phosphate reduction was first observed at 9 hours; dose not recovered in the primary abstract.
- limitations
- Transporter abundance is not itself a flux measurement. Lack of a PTH rise and parathyroidectomized-rat responses support a PTH-independent action in this experiment.
- 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; Rattus norvegicus
- plain_language
- FGF23 reduced a kidney transporter that normally helps retain phosphate.
- primary_references
- [vdm-shimada2004] FGF-23 is a potent regulator of vitamin D metabolism and phosphate homeostasis. (2004). https://pubmed.ncbi.nlm.nih.gov/15040831/ DOI: 10.1359/jbmr.0301264
- tissue_or_cell_type
- Kidney
Vitamin D2 and D3: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 745–759
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Single recombinant FGF23 injection in rodents; renal transcript/protein and serum phosphate measurements · source_derived_draft · unverified_draft
### vdm-fgf23-reduces-renal-napi2a Recombinant FGF23 reduced renal NaPi-IIa mRNA and protein abundance in the acute rodent injection study. Condition category: normal nutrient_topic: Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. plain_language: FGF23 reduced a kidney transporter that normally helps retain phosphate. organism: Mus musculus; Rattus norvegicus tissue_or_cell_type: Kidney experimental_model: Single recombinant FGF23 injection in rodents; renal transcript/protein and serum phosphate measurements limitations: Transporter abundance is not itself a flux measurement. Lack of a PTH rise and parathyroidectomized-rat responses support a PTH-independent action in this experiment. exposure: Single recombinant FGF23 injection; serum phosphate reduction was first observed at 9 hours; dose not recovered in the primary abstract. cross_nutrient: Vitamin D–calcium–phosphate regulation. evidence_locator: Abstract: reported experimental results nutrient: Vitamin D2 and D3 evidence_scope: D3 active metabolite or VDR machinery experiment; not a direct D2-versus-D3 comparison. [vdm-shimada2004] FGF-23 is a potent regulator of vitamin D metabolism and phosphate homeostasis. (2004). https://pubmed.ncbi.nlm.nih.gov/15040831/ DOI: 10.1359/jbmr.0301264
Complete structured claim and evidencePotassium deficiency increased brush-border NaPi-IIa abundance in the studied rat experiments despite reduced total sodium-dependent phosphate transport.
Experimental context and source evidence
- availability_state
- nutrient_deficiency Imported condition classification; unverified.
- cross_nutrient
- Potassium deficiency changes sodium-phosphate transport machinery in an isoform-specific manner.
- endpoint
- Potassium deficiency increased brush-border NaPi-IIa abundance in the studied rat experiments despite reduced total sodium-dependent phosphate transport.
- experimental-exposure
- Potassium-deficient rats and mice; renal brush-border membrane protein, transcript, immunofluorescence and electron-microscopy analyses.
- experimental_model
- Potassium-deficient rats and mice; renal brush-border membrane protein, transcript, immunofluorescence and electron-microscopy analyses.
- limitations
- Isoform abundance and localization do not apportion total phosphate flux; transporter-specific contributions and initiating signal remain unresolved.
- nutrient_topic
- Potassium research collection; topical membership is not evidence of a direct dietary effect. · Potassium
- organism
- Rattus norvegicus; Mus musculus where specified
- plain_language
- More of one transporter did not mean greater overall phosphate recovery.
- primary_references
- [breusegem-2009-phosphate] Differential regulation of the renal sodium-phosphate cotransporters NaPi-IIa, NaPi-IIc, and PiT-2 in dietary potassium deficiency (2009). https://pubmed.ncbi.nlm.nih.gov/19493963/ DOI: 10.1152/ajprenal.90765.2008
- tissue_or_cell_type
- renal proximal-tubule brush border
- trigger_kind
- nutrient_deficiency Imported condition classification; unverified.
Potassium: cross-nutrient mechanisms and deficiency (2026-09-17) · lines 1372–1384
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Potassium-deficient rats and mice; renal brush-border membrane protein, transcript, immunofluorescence and electron-microscopy analyses. · source_derived_draft · unverified_draft
### k-deficiency-napi2a-abundance Potassium deficiency increased brush-border NaPi-IIa abundance in the studied rat experiments despite reduced total sodium-dependent phosphate transport. Condition category: nutrient_deficiency nutrient_topic: Potassium research collection; topical membership is not evidence of a direct dietary effect. plain_language: More of one transporter did not mean greater overall phosphate recovery. organism: Rattus norvegicus; Mus musculus where specified tissue_or_cell_type: renal proximal-tubule brush border experimental_model: Potassium-deficient rats and mice; renal brush-border membrane protein, transcript, immunofluorescence and electron-microscopy analyses. limitations: Isoform abundance and localization do not apportion total phosphate flux; transporter-specific contributions and initiating signal remain unresolved. cross_nutrient: Potassium deficiency changes sodium-phosphate transport machinery in an isoform-specific manner. experimental-exposure: Potassium-deficient rats and mice; renal brush-border membrane protein, transcript, immunofluorescence and electron-microscopy analyses. endpoint: Potassium deficiency increased brush-border NaPi-IIa abundance in the studied rat experiments despite reduced total sodium-dependent phosphate transport. [breusegem-2009-phosphate] Differential regulation of the renal sodium-phosphate cotransporters NaPi-IIa, NaPi-IIc, and PiT-2 in dietary potassium deficiency (2009). https://pubmed.ncbi.nlm.nih.gov/19493963/ DOI: 10.1152/ajprenal.90765.2008
Complete structured claim and evidence
Where it participates (unsigned role)
Magnesium deprivation decreased renal slc34a1-mrna abundance in the 21-day rat experiment.
Experimental context and source evidence
- availability_state
- nutrient_deficiency Imported condition classification; unverified.
- cross_nutrient
- Magnesium -> vitamin D/phosphate handling; transcript-level evidence.
- experimental_model
- Mg-free versus 0.05% Mg diet.
- limitations
- mRNA endpoint; no transporter flux or obligatory enzyme-bound Mg inference.
- nutrient_topic
- Magnesium research collection; topical membership is not evidence of a direct dietary effect. · Magnesium
- organism
- Rattus norvegicus
- plain_language
- The message for one phosphate-reabsorbing transporter fell.
- primary_references
- [mg-matsuzaki2013] Magnesium deficiency regulates vitamin D metabolizing enzymes and type II sodium-phosphate cotransporter mRNA expression in rats (2013). https://pubmed.ncbi.nlm.nih.gov/23816829/ DOI: 10.1684/mrh.2013.0341
- tissue_or_cell_type
- Rat kidney
- trigger_kind
- nutrient_deficiency Imported condition classification; unverified.
Magnesium: cross-nutrient mechanisms and deficiency (2026-09-17) · lines 1406–1416
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Mg-free versus 0.05% Mg diet. · source_derived_draft · unverified_draft
### mg-deficiency-napi2a-transcript Magnesium deprivation decreased renal slc34a1-mrna abundance in the 21-day rat experiment. Condition category: nutrient_deficiency nutrient_topic: Magnesium research collection; topical membership is not evidence of a direct dietary effect. plain_language: The message for one phosphate-reabsorbing transporter fell. organism: Rattus norvegicus tissue_or_cell_type: Rat kidney experimental_model: Mg-free versus 0.05% Mg diet. limitations: mRNA endpoint; no transporter flux or obligatory enzyme-bound Mg inference. cross_nutrient: Magnesium -> vitamin D/phosphate handling; transcript-level evidence. [mg-matsuzaki2013] Magnesium deficiency regulates vitamin D metabolizing enzymes and type II sodium-phosphate cotransporter mRNA expression in rats (2013). https://pubmed.ncbi.nlm.nih.gov/23816829/ DOI: 10.1684/mrh.2013.0341
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.