Component
Rat hephaestin Heph
Rat hephaestin Heph. Species, exposure and limitations are retained in each linked claim.
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
Rat Atp7a knockdown increased hephaestin expression more than tenfold and increased ferroxidase activity, even though net iron uptake and efflux fell.
Experimental context and source evidence
- evidence_span
- {"source_cache": "artifacts/copper-research/27714044.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "5e8791edb75475ba74e95cddc330c06512ef3b9c02a0c5a6b203327c047dff37", "start_char": 0, "end_char": 1780, "text_sha256": "5e8791edb75475ba74e95cddc330c06512ef3b9c02a0c5a6b203327c047dff37"}
- experimental_model
- ATP7A knockdown in differentiated intestinal cell cultures
- exposure
- ATP7A knockdown and radiolabeled iron transport
- limitations
- Reductionist cell models; increased enzyme activity did not guarantee increased net iron flux. Molecular expression details were measured in the rat line.
- nutrient_topic
- Copper research collection; topical membership is not evidence of a direct dietary effect. · Copper
- organism
- Rat
- plain_language
- Compensatory enzyme increases did not repair the overall transport chain.
- primary_references
- [copper-p27714044] Knockdown of copper-transporting ATPase 1 (Atp7a) impairs iron flux in fully-differentiated rat (IEC-6) and human (Caco-2) intestinal epithelial cells. (2016). https://pubmed.ncbi.nlm.nih.gov/27714044/ DOI: 10.1039/c6mt00126b
- tissue_or_cell_type
- IEC-6 cells
Copper: transport, cuproenzymes, deficiency, excess and nutrient interactions (2026-09-17) · lines 910–921
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · ATP7A knockdown in differentiated intestinal cell cultures · source_derived_draft · unverified_draft
### copper-rat-atp7a-heph-compensation Rat Atp7a knockdown increased hephaestin expression more than tenfold and increased ferroxidase activity, even though net iron uptake and efflux fell. Condition category: normal nutrient_topic: Copper research collection; topical membership is not evidence of a direct dietary effect. plain_language: Compensatory enzyme increases did not repair the overall transport chain. organism: Rat tissue_or_cell_type: IEC-6 cells experimental_model: ATP7A knockdown in differentiated intestinal cell cultures limitations: Reductionist cell models; increased enzyme activity did not guarantee increased net iron flux. Molecular expression details were measured in the rat line. exposure: ATP7A knockdown and radiolabeled iron transport evidence_span: {"source_cache": "artifacts/copper-research/27714044.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "5e8791edb75475ba74e95cddc330c06512ef3b9c02a0c5a6b203327c047dff37", "start_char": 0, "end_char": 1780, "text_sha256": "5e8791edb75475ba74e95cddc330c06512ef3b9c02a0c5a6b203327c047dff37"} [copper-p27714044] Knockdown of copper-transporting ATPase 1 (Atp7a) impairs iron flux in fully-differentiated rat (IEC-6) and human (Caco-2) intestinal epithelial cells. (2016). https://pubmed.ncbi.nlm.nih.gov/27714044/ DOI: 10.1039/c6mt00126b
Complete structured claim and evidence
Where it participates (unsigned role)
Copper-deficient rats had enterocyte hephaestin protein at about 35% of copper-adequate controls.
Experimental context and source evidence
- availability_state
- nutrient_deficiency Imported condition classification; unverified.
- evidence_span
- {"source_cache": "artifacts/copper-research/15623839.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "5e3723e4fdd961caf66979e26614d98cbfbd65f38ba48232428e5302c054c3ac", "start_char": 0, "end_char": 1613, "text_sha256": "5e3723e4fdd961caf66979e26614d98cbfbd65f38ba48232428e5302c054c3ac"}
- experimental_model
- Controlled copper-deficient versus adequate diets with radiolabeled iron
- exposure
- Less than 0.3 versus 5 mg copper/kg diet; male and female weanlings
- limitations
- Animal depletion regimens are not human thresholds. Iron redistribution differed by sex.
- nutrient_topic
- Copper research collection; topical membership is not evidence of a direct dietary effect. · Copper
- organism
- Rat
- plain_language
- Copper shortage reduced part of the intestine’s iron-processing machinery.
- primary_references
- [copper-p15623839] Dietary copper deficiency reduces iron absorption and duodenal enterocyte hephaestin protein in male and female rats. (2005). https://pubmed.ncbi.nlm.nih.gov/15623839/ DOI: 10.1093/jn/135.1.92
- tissue_or_cell_type
- Duodenal enterocytes and whole-body iron
- trigger_kind
- nutrient_deficiency Imported condition classification; unverified.
Copper: transport, cuproenzymes, deficiency, excess and nutrient interactions (2026-09-17) · lines 858–869
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Controlled copper-deficient versus adequate diets with radiolabeled iron · source_derived_draft · unverified_draft
### copper-cud-hephaestin Copper-deficient rats had enterocyte hephaestin protein at about 35% of copper-adequate controls. Condition category: nutrient_deficiency nutrient_topic: Copper research collection; topical membership is not evidence of a direct dietary effect. plain_language: Copper shortage reduced part of the intestine’s iron-processing machinery. organism: Rat tissue_or_cell_type: Duodenal enterocytes and whole-body iron experimental_model: Controlled copper-deficient versus adequate diets with radiolabeled iron limitations: Animal depletion regimens are not human thresholds. Iron redistribution differed by sex. exposure: Less than 0.3 versus 5 mg copper/kg diet; male and female weanlings evidence_span: {"source_cache": "artifacts/copper-research/15623839.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "5e3723e4fdd961caf66979e26614d98cbfbd65f38ba48232428e5302c054c3ac", "start_char": 0, "end_char": 1613, "text_sha256": "5e3723e4fdd961caf66979e26614d98cbfbd65f38ba48232428e5302c054c3ac"} [copper-p15623839] Dietary copper deficiency reduces iron absorption and duodenal enterocyte hephaestin protein in male and female rats. (2005). https://pubmed.ncbi.nlm.nih.gov/15623839/ DOI: 10.1093/jn/135.1.92
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.