Cited by 45Pancreatic function and diabetesDiabetes Treatment and ManagementMitochondrial Function and Pathology

Palmitate-induced impairment of glucose-stimulated insulin secretion precedes mitochondrial dysfunction in mouse pancreatic islets

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Barlow, Jonathan, Jensen, Verena Hirschberg, Jastroch, Martin, Affourtit, Charles·2016·Biochemical Journal

Abstract

It has been well established that excessive levels of glucose and palmitate lower glucose-stimulated insulin secretion (GSIS) by pancreatic β-cells. This β-cell ‘glucolipotoxicity’ is possibly mediated by mitochondrial dysfunction, but involvement of bioenergetic failure in the pathological mechanism is the subject of ongoing debate. We show in the present study that increased palmitate levels impair GSIS before altering mitochondrial function. We demonstrate that GSIS defects arise from increased insulin release under basal conditions in addition to decreased insulin secretion under glucose-stimulatory conditions. Real-time respiratory analysis of intact mouse pancreatic islets reveals that mitochondrial ATP synthesis is not involved in the mechanism by which basal insulin is elevated. Equally, mitochondrial lipid oxidation and production of reactive oxygen species (ROS) do not contribute to increased basal insulin secretion. Palmitate does not affect KCl-induced insulin release at a basal or stimulatory glucose level, but elevated basal insulin release is attenuated by palmitoleate and associates with increased intracellular calcium. These findings deepen our understanding of β-cell glucolipotoxicity and reveal that palmitate-induced GSIS impairment is disconnected from mitochondrial dysfunction, a notion that is important when targeting β-cells for the treatment of diabetes and when assessing islet function in human transplants.

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Authors
Barlow, J., Jensen, V. H., Jastroch, M., & Affourtit, C.
Affiliations
  • University of Plymouth (GB)
  • School of Biomedical and Healthcare Sciences, Plymouth University, Drake Circus, Plymouth PL4 8AA, U.K.
  • Helmholtz Diabetes Center and Institute for Diabetes and Obesity, Garching, Parkring 13, Garching D-85748, Germany
Corresponding author
  • Barlow, Jonathan
  • Affourtit, Charles
Venue
Biochemical Journal
Published
2016-02-09
Volume
473
Issue
4
Pages
487-496
ISSN
  • 0264-6021 (ISSN-L)
  • 1470-8728
OpenAlex
W2228066206
Cited by
45
References
43
Citations by year
2025: 3 · 2024: 1 · 2023: 3 · 2022: 2 · 2021: 4 · 2020: 7 · 2019: 5 · 2018: 9 · 2017: 8 · 2016: 3
FWCI
6.74
Type
journal article
Language
en
Open access
Locations
  • Biochemical Journal (publishedVersion)
  • PubMed (publishedVersion)
  • PEARL (University of Plymouth) (submittedVersion)
  • Site cant be reached (submittedVersion)
Funders
  • University of Exeter
  • Medical Research Council (G1100165)
  • Helmholtz Zentrum München
Topics
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
Keywords
palmitate, glucose-stimulated insulin secretion, pancreatic beta cells, glucolipotoxicity, mitochondrial dysfunction, basal insulin secretion, mitochondrial ATP production, reactive oxygen species, palmitoleic acid, intracellular calcium, diabetes mellitus, islet transplantation
MeSH terms
Insulin Secretion, Animals, Cell Line, Female, Glucose, Insulin, Islets of Langerhans, Male, Mice, Inbred C57BL, Mitochondria, Palmitic Acid, Mice

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