Cited by 42Pancreatic function and diabetesMitochondrial Function and PathologyMetabolism, Diabetes, and Cancer

Plasma Membrane Potential Oscillations in Insulin Secreting Ins-1 832/13 Cells Do Not Require Glycolysis and Are Not Initiated by Fluctuations in Mitochondrial Bioenergetics

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Goehring, Isabel, Gerencser, Akos A., Schmidt, Sara, Brand, Martin D., Mulder, Hindrik, Nicholls, David G.·2012·Journal of Biological Chemistry

Abstract

Oscillations in plasma membrane potential play a central role in glucose-induced insulin secretion from pancreatic β-cells and related insulinoma cell lines. We have employed a novel fluorescent plasma membrane potential (Δψ(p)) indicator in combination with indicators of cytoplasmic free Ca(2+) ([Ca(2+)](c)), mitochondrial membrane potential (Δψ(m)), matrix ATP concentration, and NAD(P)H fluorescence to investigate the role of mitochondria in the generation of plasma membrane potential oscillations in clonal INS-1 832/13 β-cells. Elevated glucose caused oscillations in plasma membrane potential and cytoplasmic free Ca(2+) concentration over the same concentration range required for insulin release, although considerable cell-to-cell heterogeneity was observed. Exogenous pyruvate was as effective as glucose in inducing oscillations, both in the presence and absence of 2.8 mM glucose. Increased glucose and pyruvate each produced a concentration-dependent mitochondrial hyperpolarization. The causal relationships between pairs of parameters (Δψ(p) and [Ca(2+)](c), Δψ(p) and NAD(P)H, matrix ATP and [Ca(2+)](c), and Δψ(m) and [Ca(2+)](c)) were investigated at single cell level. It is concluded that, in these β-cells, depolarizing oscillations in Δψ(p) are not initiated by mitochondrial bioenergetic changes. Instead, regardless of substrate, it appears that the mitochondria may simply be required to exceed a critical bioenergetic threshold to allow release of insulin. Once this threshold is exceeded, an autonomous Δψ(p) oscillatory mechanism is initiated.

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Crossref · 10.1074/jbc.m111.314567

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  • Insulin-secreting pancreatic β-cells and islets from people with type 2 diabetes show mitochondrial physiology alterations, including membrane hyperpolarization and decreased activities of glycerol phosphate dehydrogenase, pyruvate carboxylase, and succinyl-CoA-3-ketoacid-CoA transferase.

    “Additionally, analysis of insulin-secreting pancreatic β-cells and islets from patients with T2DM showed alterations in mitochondrial physiology, such as hyperpolarization of the mitochondrial membrane and decreased activities of the enzymes glycerol phosphate dehydrogenase, pyruvate carboxylase and succinyl-CoA–3-ketoacid-CoA transferase147,148.”

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Authors
Goehring, I., Gerencser, A. A., Schmidt, S., Brand, M. D., Mulder, H., & Nicholls, D. G.
Affiliations
  • Buck Institute for Research on Aging (US)
  • Lund University (SE)
Corresponding author
Nicholls, David G.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2012-05
Volume
287
Issue
19
Pages
15706-15717
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1987930017
Cited by
42
References
54
Citations by year
2025: 3 · 2023: 2 · 2022: 4 · 2021: 2 · 2020: 1 · 2018: 4 · 2017: 2 · 2016: 3 · 2015: 6 · 2014: 6 · 2013: 7 · 2012: 1
FWCI
6.51
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Lund University Publications (Lund University) (submittedVersion)
Funders
National Institute on Aging (P01AG025901, P30AG025708)
Topics
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
Keywords
insulin secretion, INS-1 832/13 cells, pancreatic beta cells, insulinoma, mitochondrial membrane potential, mitochondrial hyperpolarization, mitochondrial bioenergetics, cytosolic free calcium, pyruvate, glucose, glycolysis, NAD(P)H, single-cell heterogeneity
MeSH terms
Insulin Secretion, Adenosine Triphosphate, Animals, Calcium, Dose-Response Relationship, Drug, Energy Metabolism, Glucose, Glycolysis, Insulin, Insulinoma, Membrane Potentials, Microscopy, Fluorescence, Mitochondria, Pyruvic Acid, Cell Line, Tumor, Rats, Membrane Potential, Mitochondrial

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