Component
MUC2 gene
Mucin 2 genomic locus; airway-culture claims measure transcript expression.
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)
Removing RA from airway epithelial culture medium sharply reduced mucin secretion.
Experimental context and source evidence
- availability_state
- nutrient_deficiency Imported condition classification; unverified.
- evidence_locator
- Abstract
- experimental_model
- Human normal tracheobronchial epithelial air-liquid interface cultures.
- exposure
- RA withdrawal
- limitations
- Does not demonstrate airway infection protection.
- nutrient_topic
- Vitamin A research collection; topical membership is not evidence of a direct dietary effect. · Vitamin A
- organism
- Homo sapiens
- plain_language
- RA availability helps maintain the secretory phenotype in cultured airway cells.
- primary_references
- [va-yoon-1997] Regulation of the secretory phenotype of human airway epithelium by retinoic acid, triiodothyronine, and extracellular matrix (1997). https://pubmed.ncbi.nlm.nih.gov/9191474/ DOI: 10.1165/ajrcmb.16.6.9191474
- tissue_or_cell_type
- Normal tracheobronchial epithelial air-liquid interface culture
- trigger_kind
- nutrient_deficiency Imported condition classification; unverified.
Vitamin A: forms, mechanisms, deficiency and excess (2026-09-17) · lines 1383–1394
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Human normal tracheobronchial epithelial air-liquid interface cultures. · source_derived_draft · unverified_draft
### va-sig-ra-airway-secretion Removing RA from airway epithelial culture medium sharply reduced mucin secretion. Condition category: nutrient_deficiency nutrient_topic: Vitamin A research collection; topical membership is not evidence of a direct dietary effect. plain_language: RA availability helps maintain the secretory phenotype in cultured airway cells. organism: Homo sapiens tissue_or_cell_type: Normal tracheobronchial epithelial air-liquid interface culture experimental_model: Human normal tracheobronchial epithelial air-liquid interface cultures. limitations: Does not demonstrate airway infection protection. evidence_locator: Abstract exposure: RA withdrawal [va-yoon-1997] Regulation of the secretory phenotype of human airway epithelium by retinoic acid, triiodothyronine, and extracellular matrix (1997). https://pubmed.ncbi.nlm.nih.gov/9191474/ DOI: 10.1165/ajrcmb.16.6.9191474
Complete structured claim and evidenceRAR alpha-selective pharmacology supported RAR alpha-mediated induction of airway mucin transcripts, including MUC5AC.
Experimental context and source evidence
- evidence_locator
- Abstract
- experimental_model
- Normal human tracheobronchial epithelial cultures with receptor-selective agonists/antagonists.
- exposure
- Receptor-selective agonists/antagonists
- limitations
- Transcript changes do not establish improved mucus clearance.
- nutrient_topic
- Vitamin A research collection; topical membership is not evidence of a direct dietary effect. · Vitamin A
- organism
- Homo sapiens
- plain_language
- RAR signaling helps cultured airway cells adopt a mucus-producing program.
- primary_references
- [va-koo-1999] Role of retinoid receptors in the regulation of mucin gene expression by retinoic acid in human tracheobronchial epithelial cells (1999). https://pubmed.ncbi.nlm.nih.gov/10024510/ DOI: 10.1042/bj3380351
- tissue_or_cell_type
- Normal tracheobronchial epithelial cells
Vitamin A: forms, mechanisms, deficiency and excess (2026-09-17) · lines 1357–1368
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Normal human tracheobronchial epithelial cultures with receptor-selective agonists/antagonists. · source_derived_draft · unverified_draft
### va-sig-rara-airway-mucin RAR alpha-selective pharmacology supported RAR alpha-mediated induction of airway mucin transcripts, including MUC5AC. Condition category: normal nutrient_topic: Vitamin A research collection; topical membership is not evidence of a direct dietary effect. plain_language: RAR signaling helps cultured airway cells adopt a mucus-producing program. organism: Homo sapiens tissue_or_cell_type: Normal tracheobronchial epithelial cells experimental_model: Normal human tracheobronchial epithelial cultures with receptor-selective agonists/antagonists. limitations: Transcript changes do not establish improved mucus clearance. evidence_locator: Abstract exposure: Receptor-selective agonists/antagonists [va-koo-1999] Role of retinoid receptors in the regulation of mucin gene expression by retinoic acid in human tracheobronchial epithelial cells (1999). https://pubmed.ncbi.nlm.nih.gov/10024510/ DOI: 10.1042/bj3380351
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.