Cited by 11Ion channel regulation and functionAdenosine and Purinergic SignalingIon Transport and Channel Regulation

Running out of time: the decline of channel activity and nucleotide activation in adenosine triphosphate-sensitive K-channels

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Proks, Peter, Puljung, Michael C., Vedovato, Natascia, Sachse, Gregor, Mulvaney, Rachel, Ashcroft, Frances M.·2016·Philosophical Transactions of the Royal Society B: Biological Sciences

Abstract

K ATP channels act as key regulators of electrical excitability by coupling metabolic cues—mainly intracellular adenine nucleotide concentrations—to cellular potassium ion efflux. However, their study has been hindered by their rapid loss of activity in excised membrane patches (rundown), and by a second phenomenon, the d ecline of a ctivation by M g- n ucleotides (DAMN). Degradation of PI(4,5)P 2 and other phosphoinositides is the strongest candidate for the molecular cause of rundown. Broad evidence indicates that most other determinants of rundown (e.g. phosphorylation, intracellular calcium, channel mutations that affect rundown) also act by influencing K ATP channel regulation by phosphoinositides. Unfortunately, experimental conditions that reproducibly prevent rundown have remained elusive, necessitating post hoc data compensation. Rundown is clearly distinct from DAMN. While the former is associated with pore-forming Kir6.2 subunits, DAMN is generally a slower process involving the regulatory sulfonylurea receptor (SUR) subunits. We speculate that it arises when SUR subunits enter non-physiological conformational states associated with the loss of SUR nucleotide-binding domain dimerization following prolonged exposure to nucleotide-free conditions. This review presents new information on both rundown and DAMN, summarizes our current understanding of these processes and considers their physiological roles. This article is part of the themed issue ‘Evolution brings Ca 2+ and ATP together to control life and death’.

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  • The number of KATP channels per β-cell is not known with certainty because open probability varies with measurement conditions.

    “However, the open probability varies considerably according to how it is measured: in cell-attached patches it varies with the intracellular ATP concentration, while in inside-out patches it diminishes with time after patch excision (rundown; (526). Accordingly, the number of KATP channels per β-cell is not known with certainty.”

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Cited by

Sorted by citations

Authors
Proks, P., Puljung, M. C., Vedovato, N., Sachse, G., Mulvaney, R., & Ashcroft, F. M.
Affiliations
University of Oxford (GB)
Corresponding author
Ashcroft, Frances M.
Venue
Philosophical Transactions of the Royal Society B: Biological Sciences
Published
2016-08-05
Volume
371
Issue
1700
Pages
20150426
ISSN
  • 0962-8436 (ISSN-L)
  • 1471-2970
OpenAlex
W2470292920
Cited by
11
References
2
Citations by year
2022: 1 · 2021: 2 · 2020: 3 · 2019: 1 · 2018: 2 · 2017: 1 · 2016: 1
FWCI
0.15
Type
journal article
Language
en
Open access
Locations
  • Philosophical Transactions of the Royal Society B Biological Sciences (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Oxford University Research Archive (ORA) (University of Oxford) (acceptedVersion, cc-by)
Funders
  • Wellcome Trust (046692)
  • Sixth Framework Programme (322620)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Physiology › Adenosine and Purinergic Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion Transport and Channel Regulation
Keywords
ATP-sensitive potassium channels, rundown, nucleotide activation, Kir6.2, sulfonylurea receptor, phosphoinositides, channel regulation, excitable cells
MeSH terms
Animals, Biological Transport, Nucleotides, KATP Channels

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