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ATP-sensitive potassium channel subunit Kir6.1 (Kir6.1)
- Target
- Kir6.1
- Molecular classification
- Ion channel, Potassium channel, Inwardly rectifying potassium channel, Kir channel subunit
01
Overview
Kir6.1 is a pore-forming subunit of the ATP-sensitive potassium (KATP) channel, encoded by the KCNJ8 gene. KATP channels are hetero-octameric complexes composed of four Kir6.x subunits (Kir6.1 or Kir6.2) and four regulatory sulfonylurea receptor (SUR) subunits. These channels link cellular metabolism to membrane excitability by sensing intracellular nucleotide concentrations and modulating potassium ion flow. Kir6.1 is highly expressed in vascular smooth muscle, brain pericytes, skeletal muscle, cardiac tissue, pancreatic β-cells, and neurons. It plays a crucial role in regulating vascular tone, blood pressure, cerebral perfusion, and protecting against metabolic stress.
- Other names
- KCNJ8Inwardly rectifying potassium channel 16BIR (brain inward rectifier)KATP channel subunit Kir6.1
02
Mechanism of action
Sulfonylureas inhibit KATP channels by binding to the SUR subunit, leading to membrane depolarization and increased insulin secretion in pancreatic beta cells.
03
Biological functions
Regulation of vascular toneRegulation of blood pressureCoupling of cellular metabolism to membrane excitabilityRegulation of cerebral blood flowCellular protection against metabolic stress
04
Disease associations
HypertensionCardiovascular diseaseCerebral ischemia
05
Safety considerations
Potential for hypoglycemia with sulfonylurea drugsTissue-specific effects of KATP channel modulation need to be considered to avoid unwanted side effects
06
Interacting drugs
Sulfonylureas
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