Cited by 71Mitochondrial Function and PathologyPancreatic function and diabetesATP Synthase and ATPases Research

Stronger control of ATP/ADP by proton leak in pancreatic β-cells than skeletal muscle mitochondria

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Affourtit, Charles, Brand, Martin D.·2006·Biochemical Journal

Abstract

Pancreatic beta cells respond to rising blood glucose concentrations by increasing their oxidative metabolism, which leads to an increased ATP/ADP ratio, closure of KATP channels, depolarization of the plasma membrane potential, influx of calcium and the eventual secretion of insulin. Such a signalling mechanism implies that the ATP/ADP ratio is flexible in beta cells (β-cells), which is in contrast with other cell types (e.g. muscle and liver) that maintain a stable ATP/ADP poise while respiring at widely varying rates. To determine whether this difference in flexibility is accounted for by mitochondrial peculiarities, we performed a top-down metabolic control analysis to quantitatively assess how ATP/ADP is controlled in mitochondria isolated from rat skeletal muscle and cultured beta cells. We show that the ATP/ADP ratio is more strongly controlled (approx. 7.5-fold) by proton leak in beta cells than in muscle. The comparatively high importance of proton leak in beta cell mitochondria (relative to phosphorylation) is evidenced furthermore by its relatively high level of control over membrane potential and overall respiratory activity. Modular-kinetic analysis of oxidative phosphorylation reveals that these control differences can be fully explained by a higher relative leak activity in beta cell mitochondria, which results in a comparatively high contribution of proton leak to the overall respiratory activity in this system.

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Authors
Affourtit, C., & Brand, M. D.
Affiliations
MRC Mitochondrial Biology Unit (GB)
Venue
Biochemical Journal
Published
2005-12-12
Volume
393
Issue
1
Pages
151-159
ISSN
  • 0264-6021 (ISSN-L)
  • 1470-8728
OpenAlex
W2028086207
Cited by
71
References
52
Citations by year
2026: 2 · 2025: 2 · 2024: 8 · 2023: 1 · 2022: 3 · 2021: 2 · 2020: 2 · 2019: 1 · 2018: 3 · 2017: 2 · 2016: 5 · 2015: 3 · 2014: 4 · 2013: 6 · 2012: 3
FWCI
1.00
Type
journal article
Language
en
Open access
Locations
  • Biochemical Journal (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Medical Research Council
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › ATP Synthase and ATPases Research
Keywords
ATP/ADP ratio, mitochondrial proton leak, pancreatic beta cells, skeletal muscle mitochondria, metabolic control analysis, oxidative phosphorylation, mitochondrial membrane potential, mitochondrial respiration, insulin secretion, glucose-stimulated insulin secretion
MeSH terms
Adenosine Diphosphate, Adenosine Triphosphate, Animals, Cell Membrane, Female, Membrane Potentials, Mitochondria, Oxygen Consumption, Protons, Rats, Wistar, Muscle, Skeletal, Insulin-Secreting Cells, Rats

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