Cited by 1,208Ion channel regulation and functionPancreatic function and diabetesIon Transport and Channel Regulation

Intracellular ATP directly blocks K+ channels in pancreatic B-cells

Cook, Daniel L., Hales, Nicholas·1984·Nature

Abstract

It is known that glucose-induced depolarization of pancreatic B-cells is due to reduced membrane K+-permeability and is coupled to an increase in the rate of glycolysis, but there has been no direct evidence linking specific metabolic processes or products to the closing of membrane K+ channels. During patch-clamp studies of proton inhibition of Ca2+-activated K+ channels [GK(Ca)] in B-cells, we identified a second K+-selective channel which is rapidly and reversibly inhibited by ATP applied to the cytoplasmic surface of the membrane. This channel is spontaneously active in excised patches and frequently coexists with GK(Ca) channels yet is insensitive to membrane potential and to intracellular free Ca2+ and pH. Blocking of the channel is ATP-specific and appears not to require metabolism of the ATP. This ATP-sensitive K+ channel [GK(ATP)] may be a link between metabolism and membrane K+-permeability in pancreatic B-cells.

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Crossref · 10.1038/311271a0

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  • Metabolic regulation of the KATP channel is mediated by changes in intracellular concentrations of ATP and MgADP, which inhibit and stimulate the channel, respectively.

    “Metabolic regulation of the channel is mediated by changes in the intracellular concentrations of ATP and MgADP, which inhibit and stimulate the channel, respectively (127, 163, 328).”
  • In excised inside-out patches, ATP inhibition of KATP channels is half-maximal at ≈10 μM in the absence of Mg2+, but this increases to 20-30 μM in the presence of Mg2+ due to simultaneous Mg-nucleotide stimulation via SUR1.

    “In excised inside-out patches, ATP inhibition is half-maximal at ≈10 μM in the absence of Mg2+ (127), but this increases to 20-30 µM in the presence of Mg2+ due to the simultaneous presence of Mg-nucleotide stimulation via SUR1 (234).”

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Authors
Cook, D. L., & Hales, N.
Affiliations
United States Department of Veterans Affairs (US)
Venue
Nature
Published
1984-09
Volume
311
Issue
5983
Pages
271-273
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W1985770721
Cited by
1,208
References
24
Citations by year
2026: 11 · 2025: 16 · 2024: 12 · 2023: 22 · 2022: 14 · 2021: 21 · 2020: 12 · 2019: 19 · 2018: 13 · 2017: 9 · 2016: 15 · 2015: 21 · 2014: 34 · 2013: 14 · 2012: 29
FWCI
13.20
Type
journal article
Language
en
Open access
closed
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion Transport and Channel Regulation
Keywords
ATP-sensitive potassium channels, pancreatic beta cells, intracellular ATP, potassium channel inhibition, glycolysis, proton inhibition, calcium-activated potassium channels
MeSH terms
Adenosine Triphosphate, Animals, Cell Membrane Permeability, Cells, Cultured, Cytoplasm, Electric Conductivity, Ion Channels, Islets of Langerhans, Potassium, Rats

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