Component
KCNJ2 / Kir2.1
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 it acts on
Endothelial Kir2.1 deletion reduced whisker-stimulation cerebral blood-flow responses by roughly half.
Experimental context and source evidence
- experimental_model
- Mouse endothelial knockout and cortical flow measurement.
- limitations
- Residual responses require other contributors; no cognitive or dietary outcome tested.
- nutrient_topic
- Potassium research collection; topical membership is not evidence of a direct dietary effect. · Potassium
- organism
- Mus musculus
- plain_language
- This potassium-sensing pathway contributed to activity-linked blood supply but did not account for all of it.
- primary_references
- [k-longden2017] Capillary K+-sensing initiates retrograde hyperpolarization to increase local cerebral blood flow (2017). https://pubmed.ncbi.nlm.nih.gov/28319610/ DOI: 10.1038/nn.4533
- tissue_or_cell_type
- Cerebral microcirculation
Potassium: cross-nutrient mechanisms and deficiency (2026-09-17) · lines 1616–1625
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Mouse endothelial knockout and cortical flow measurement. · source_derived_draft · unverified_draft
### k-kir21-functional-hyperemia Endothelial Kir2.1 deletion reduced whisker-stimulation cerebral blood-flow responses by roughly half. Condition category: normal nutrient_topic: Potassium research collection; topical membership is not evidence of a direct dietary effect. plain_language: This potassium-sensing pathway contributed to activity-linked blood supply but did not account for all of it. organism: Mus musculus tissue_or_cell_type: Cerebral microcirculation experimental_model: Mouse endothelial knockout and cortical flow measurement. limitations: Residual responses require other contributors; no cognitive or dietary outcome tested. [k-longden2017] Capillary K+-sensing initiates retrograde hyperpolarization to increase local cerebral blood flow (2017). https://pubmed.ncbi.nlm.nih.gov/28319610/ DOI: 10.1038/nn.4533
Complete structured claim and evidence
What acts on it
Local potassium stimulated Kir2.1-dependent capillary signaling; endothelial Kir2.1 deletion abolished the tested potassium-evoked upstream dilation.
Experimental context and source evidence
- experimental_model
- Mouse isolated capillary-arteriole preparations and in-vivo imaging.
- exposure
- Local 10 mmol/L K application.
- limitations
- Local experimental potassium exposure, not dietary supplementation.
- nutrient_topic
- Potassium research collection; topical membership is not evidence of a direct dietary effect. · Potassium
- organism
- Mus musculus
- plain_language
- Brain capillaries can send an electrical signal upstream to their supplying arteriole.
- primary_references
- [k-longden2017] Capillary K+-sensing initiates retrograde hyperpolarization to increase local cerebral blood flow (2017). https://pubmed.ncbi.nlm.nih.gov/28319610/ DOI: 10.1038/nn.4533
- tissue_or_cell_type
- Brain capillary endothelium and upstream arterioles
Potassium: cross-nutrient mechanisms and deficiency (2026-09-17) · lines 1604–1614
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Mouse isolated capillary-arteriole preparations and in-vivo imaging. · source_derived_draft · unverified_draft
### k-capillary-kir21-sensing Local potassium stimulated Kir2.1-dependent capillary signaling; endothelial Kir2.1 deletion abolished the tested potassium-evoked upstream dilation. Condition category: normal nutrient_topic: Potassium research collection; topical membership is not evidence of a direct dietary effect. plain_language: Brain capillaries can send an electrical signal upstream to their supplying arteriole. organism: Mus musculus tissue_or_cell_type: Brain capillary endothelium and upstream arterioles experimental_model: Mouse isolated capillary-arteriole preparations and in-vivo imaging. limitations: Local experimental potassium exposure, not dietary supplementation. exposure: Local 10 mmol/L K application. [k-longden2017] Capillary K+-sensing initiates retrograde hyperpolarization to increase local cerebral blood flow (2017). https://pubmed.ncbi.nlm.nih.gov/28319610/ DOI: 10.1038/nn.4533
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.