Cited by 433Pancreatic function and diabetesMitochondrial Function and PathologyDiabetes and associated disorders

Impaired insulin secretion and β-cell loss in tissue-specific knockout mice with mitochondrial diabetes

Silva, José P., Köhler, Martin, Graff, Caroline, Oldfors, Anders, Magnuson, Mark A., Berggren, Per-Olof, Larsson, Nils-Göran·2000·Nature Genetics

Abstract

Mitochondrial dysfunction is an important contributor to human pathology and it is estimated that mutations of mitochondrial DNA (mtDNA) cause approximately 0.5-1% of all types of diabetes mellitus. We have generated a mouse model for mitochondrial diabetes by tissue-specific disruption of the nuclear gene encoding mitochondrial transcription factor A (Tfam, previously mtTFA; ref. 7) in pancreatic beta-cells. This transcriptional activator is imported to mitochondria, where it is essential for mtDNA expression and maintenance. The Tfam-mutant mice developed diabetes from the age of approximately 5 weeks and displayed severe mtDNA depletion, deficient oxidative phosphorylation and abnormal appearing mitochondria in islets at the ages of 7-9 weeks. We performed physiological studies of beta-cell stimulus-secretion coupling in islets isolated from 7-9-week-old mutant mice and found reduced hyperpolarization of the mitochondrial membrane potential, impaired Ca(2+)-signalling and lowered insulin release in response to glucose stimulation. We observed reduced beta-cell mass in older mutants. Our findings identify two phases in the pathogenesis of mitochondrial diabetes; mutant beta-cells initially display reduced stimulus-secretion coupling, later followed by beta-cell loss. This animal model reproduces the beta-cell pathology of human mitochondrial diabetes and provides genetic evidence for a critical role of the respiratory chain in insulin secretion.

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Crossref · 10.1038/81649

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Authors
Silva, J. P., Köhler, M., Graff, C., Oldfors, A., Magnuson, M. A., Berggren, P.-O., & Larsson, N.-G.
Affiliations
  • Karolinska University Hospital (SE)
  • Sahlgrenska University Hospital (SE)
  • Vanderbilt University (US)
Corresponding author
Larsson, Nils-Göran
Venue
Nature Genetics
Published
2000-11
Volume
26
Issue
3
Pages
336-340
ISSN
  • 1061-4036 (ISSN-L)
  • 1546-1718
OpenAlex
W1579112009
Cited by
433
References
21
Citations by year
2026: 8 · 2025: 5 · 2024: 11 · 2023: 12 · 2022: 20 · 2021: 12 · 2020: 15 · 2019: 9 · 2018: 10 · 2017: 11 · 2016: 14 · 2015: 13 · 2014: 17 · 2013: 16 · 2012: 19
FWCI
19.08
Type
journal article
Language
en
Open access
closed
Locations
  • Nature Genetics (publishedVersion)
  • PubMed (publishedVersion)
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 › Genetics › Diabetes and associated disorders
Keywords
mitochondrial diabetes, mitochondrial dysfunction, TFAM, beta cell destruction, insulin secretion, stimulus-secretion coupling, mtDNA depletion, oxidative phosphorylation, mitochondrial membrane potential, calcium signaling, beta-cell mass, electron transport chain, pancreatic islets, mouse model
MeSH terms
Insulin Secretion, Adenosine Triphosphate, Age Factors, Animals, Calcium, Electron Transport Complex IV, Diabetes Mellitus, Disease Models, Animal, DNA-Binding Proteins, DNA, Mitochondrial, Exocytosis, Glucose, High Mobility Group Proteins, Humans, Insulin, Islets of Langerhans, Mice, Transgenic, Nuclear Proteins, Organ Specificity, Oxidative Phosphorylation, Recombinant Fusion Proteins, Secretory Rate, Succinate Dehydrogenase, Transcription Factors, Transcription, Genetic, Viral Proteins, Potassium Channels, Trans-Activators, Ion Transport, Gene Targeting, Disease Progression, Transgenes, Integrases, Calcium Channels, L-Type, Mitochondrial Proteins, Xenopus Proteins, Mice

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