Cited by 121Pancreatic function and diabetesMitochondrial Function and PathologyAutophagy in Disease and Therapy

Mitochondrial functional state in clonal pancreatic β-cells exposed to free fatty acids.

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Koshkin, Vasilij, Wang, Xiaolin, Scherer, Philipp E., Chan, Catherine B., Wheeler, Michael B.·2003·Journal of Biological Chemistry

Abstract

Excessive free fatty acid (FFA) exposure represents a potentially important diabetogenic condition that can impair insulin secretion from pancreatic beta-cells. Because mitochondrial oxidative phosphorylation is a main link between glucose metabolism and insulin secretion, in the present work we investigated the effects of the FFA oleate (OE) on mitochondrial function in the clonal pancreatic beta-cell line, MIN6. Both the long term (72 h) and short term (immediately after application) impact of OE exposure on beta-cells was investigated. After 72 h of exposure to OE (0.4 mm, 0.5% bovine serum albumin) cells were washed and permeabilized, and mitochondrial function (respiration, phosphorylation, membrane potential formation, production of reactive oxygen species) was measured in the absence or presence of OE. MIN6 cells exposed to OE for 72 h showed impaired glucose-stimulated insulin secretion and decreased cellular ATP. Mitochondria in OE-exposed cells retained normal functional characteristics in FFA-free medium; however, they were significantly more sensitive to the acute uncoupling effect of OE treatment. The mitochondria of OE-exposed cells displayed increased depolarization caused by acute OE treatment, which is attributable to the elevation in the FFA-transporting function of uncoupling protein 2 and the dicarboxylate carrier. These cells also had an increased production of reactive oxygen species in complex I of the mitochondrial respiratory chain that could be activated by FFA. A high level of reduction of respiratory complex I augmented acute FFA-induced uncoupling in a way compatible with activation of mitochondrial uncoupling protein by intramitochondrial superoxide. A stronger augmentation was observed in OE-exposed cells. Together, these events may underlie FFA-induced depression of the ATP/ADP ratio in beta-cells, which accounts for the defective glucose-stimulated insulin secretion associated with lipotoxicity.

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Crossref · 10.1074/jbc.m209709200

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  • The levels and activity of UCP2 and the rate of ROS production are both increased by high-fat diet and hyperphagia, possibly through the actions of nonesterified fatty acids and their ceramide derivatives.

    “The levels and activity of UCP2 and the rate of ROS production are both increased by high-fat diet and hyperphagia, possibly through the actions of nonesterified fatty acids and their ceramide derivatives (260).”

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Authors
Koshkin, V., Wang, X., Scherer, P. E., Chan, C. B., & Wheeler, M. B.
Affiliations
  • University of Toronto (CA)
  • Albert Einstein College of Medicine (US)
  • University of Prince Edward Island (CA)
Corresponding author
Wheeler, Michael B.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2003-05
Volume
278
Issue
22
Pages
19709-19715
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2074417648
Cited by
121
References
62
Citations by year
2025: 3 · 2024: 3 · 2023: 2 · 2022: 2 · 2021: 2 · 2020: 2 · 2019: 4 · 2018: 5 · 2017: 5 · 2016: 6 · 2015: 3 · 2014: 4 · 2013: 4 · 2012: 9
FWCI
10.57
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
Keywords
free fatty acids, oleate, pancreatic beta cells, MIN6 cells, mitochondrial function, lipotoxicity, glucose-stimulated insulin secretion, mitochondrial uncoupling, UCP2, dicarboxylate carrier, reactive oxygen species, complex I, superoxide, mitochondrial membrane potential, ATP/ADP ratio, oxidative phosphorylation
MeSH terms
Animals, Cell Line, Fatty Acids, Nonesterified, Islets of Langerhans, Mitochondria, Oxidative Phosphorylation, Reactive Oxygen Species

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