Rat insulin receptor substrate 1 / Irs1: molecular mechanisms & dependencies

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.

Human evidence only

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.

Recorded relationships

What acts on it

The chromium-histidinate-plus-biotin condition gave the highest reported IRS-1 protein levels among the compared high-fat-diet interventions in brain and liver.
Chromium(III) histidinate / CrHis → Rat insulin receptor substrate 1 / Irs1 source_derived_draftungraded
Experimental context and source evidence
evidence_span
{"source_cache": "artifacts/chromium-research/30680172.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "71e98d2ad542eca99d6726b7fb592f311b609e32c0b071375979fb1b79b632c2", "start_char": 0, "end_char": 1282, "text_sha256": "71e98d2ad542eca99d6726b7fb592f311b609e32c0b071375979fb1b79b632c2"}
experimental_model
Six-group high-fat-diet supplementation experiment
exposure
42 rats; biotin alone or with chromium histidinate, picolinate or both; 12-week exposure
limitations
No chromium-only group in this design. Protein abundance is not proof of a direct target or human cognitive benefit. Product supplied by Nutrition 21; compound-specific comparisons remain scoped.
nutrient_topic
Chromium research collection; topical membership is not evidence of a direct dietary effect. · Chromium
organism
Male Sprague-Dawley rats
plain_language
This combination changed IRS-1 abundance in the rat experiment; the independent contribution of chromium was not isolated.
primary_references
[chromium-p30680172] Effect of supplementing chromium histidinate and picolinate complexes along with biotin on insulin sensitivity and related metabolic indices in rats fed a high-fat diet. (2019). https://pubmed.ncbi.nlm.nih.gov/30680172/ DOI: 10.1002/fsn3.851
tissue_or_cell_type
Brain, liver and systemic metabolism
Chromium: transport, insulin signaling, nutrient interactions and essentiality debate (2026-09-17) · lines 744–755
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Six-group high-fat-diet supplementation experiment · source_derived_draft · unverified_draft
### chromium-biotin-rat-irs1 The chromium-histidinate-plus-biotin condition gave the highest reported IRS-1 protein levels among the compared high-fat-diet interventions in brain and liver. Condition category: normal nutrient_topic: Chromium research collection; topical membership is not evidence of a direct dietary effect. plain_language: This combination changed IRS-1 abundance in the rat experiment; the independent contribution of chromium was not isolated. organism: Male Sprague-Dawley rats tissue_or_cell_type: Brain, liver and systemic metabolism experimental_model: Six-group high-fat-diet supplementation experiment limitations: No chromium-only group in this design. Protein abundance is not proof of a direct target or human cognitive benefit. Product supplied by Nutrition 21; compound-specific comparisons remain scoped. exposure: 42 rats; biotin alone or with chromium histidinate, picolinate or both; 12-week exposure evidence_span: {"source_cache": "artifacts/chromium-research/30680172.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "71e98d2ad542eca99d6726b7fb592f311b609e32c0b071375979fb1b79b632c2", "start_char": 0, "end_char": 1282, "text_sha256": "71e98d2ad542eca99d6726b7fb592f311b609e32c0b071375979fb1b79b632c2"} [chromium-p30680172] Effect of supplementing chromium histidinate and picolinate complexes along with biotin on insulin sensitivity and related metabolic indices in rats fed a high-fat diet. (2019). https://pubmed.ncbi.nlm.nih.gov/30680172/ DOI: 10.1002/fsn3.851
Complete structured claim and evidence
In obese insulin-resistant rats, chromium picolinate increased insulin-stimulated IRS-1 phosphorylation without increasing IRS protein abundance.
Chromium(III) picolinate / CrPic → Rat insulin receptor substrate 1 / Irs1 source_derived_draftungraded
Experimental context and source evidence
evidence_span
{"source_cache": "artifacts/chromium-research/16424121.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "b0fa1d0917ec9cf4f3d309f2e9eb0e2b498e083ed1ff881b8f8df94a3cbe8119", "start_char": 0, "end_char": 1734, "text_sha256": "b0fa1d0917ec9cf4f3d309f2e9eb0e2b498e083ed1ff881b8f8df94a3cbe8119"}
experimental_model
Three-month supplementation and acute muscle insulin-signaling experiment
exposure
Chromium picolinate supplying approximately 80 µg Cr/kg/day; small obese and lean treatment groups
limitations
Model-specific supplementation. Lower phosphatase protein and activity do not prove direct chromium binding to PTP1B. Different results from cultured adipocytes are contextual, not a reason to erase either study.
nutrient_topic
Chromium research collection; topical membership is not evidence of a direct dietary effect. · Chromium
organism
Male JCR:LA-cp obese and lean rats
plain_language
The signaling protein responded more strongly without more of it being present.
primary_references
[chromium-p16424121] Chromium picolinate enhances skeletal muscle cellular insulin signaling in vivo in obese, insulin-resistant JCR:LA-cp rats. (2006). https://pubmed.ncbi.nlm.nih.gov/16424121/ DOI: 10.1093/jn/136.2.415
tissue_or_cell_type
Vastus lateralis skeletal muscle
Chromium: transport, insulin signaling, nutrient interactions and essentiality debate (2026-09-17) · lines 419–430
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Three-month supplementation and acute muscle insulin-signaling experiment · source_derived_draft · unverified_draft
### chromium-rat-irs1-phosphorylation In obese insulin-resistant rats, chromium picolinate increased insulin-stimulated IRS-1 phosphorylation without increasing IRS protein abundance. Condition category: normal nutrient_topic: Chromium research collection; topical membership is not evidence of a direct dietary effect. plain_language: The signaling protein responded more strongly without more of it being present. organism: Male JCR:LA-cp obese and lean rats tissue_or_cell_type: Vastus lateralis skeletal muscle experimental_model: Three-month supplementation and acute muscle insulin-signaling experiment limitations: Model-specific supplementation. Lower phosphatase protein and activity do not prove direct chromium binding to PTP1B. Different results from cultured adipocytes are contextual, not a reason to erase either study. exposure: Chromium picolinate supplying approximately 80 µg Cr/kg/day; small obese and lean treatment groups evidence_span: {"source_cache": "artifacts/chromium-research/16424121.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "b0fa1d0917ec9cf4f3d309f2e9eb0e2b498e083ed1ff881b8f8df94a3cbe8119", "start_char": 0, "end_char": 1734, "text_sha256": "b0fa1d0917ec9cf4f3d309f2e9eb0e2b498e083ed1ff881b8f8df94a3cbe8119"} [chromium-p16424121] Chromium picolinate enhances skeletal muscle cellular insulin signaling in vivo in obese, insulin-resistant JCR:LA-cp rats. (2006). https://pubmed.ncbi.nlm.nih.gov/16424121/ DOI: 10.1093/jn/136.2.415
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.

Rat insulin receptor substrate 1 / Irs1