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Suppression of beta cell energy metabolism and insulin release by PGC-1alpha

J Cliff Yoon1, Gang Xu, Jude T Deeney

  • 1Dana-Farber Cancer Institute and Department of Cell Biology, Harvard Medical School, Boston, MA 02215, USA.

Developmental Cell
|July 11, 2003
PubMed

Insights

Elevated PGC-1alpha in pancreatic beta cells impairs insulin secretion, contributing to type 2 diabetes. This molecular defect affects glucose metabolism and insulin release, highlighting PGC-1alpha

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Metabolic Diseases

Background:

  • Beta cell dysfunction is a key factor in type 2 diabetes pathogenesis.
  • The precise molecular mechanisms underlying beta cell dysfunction remain largely unknown.

Purpose of the Study:

  • To investigate the role of the transcriptional coactivator PGC-1alpha in beta cell function and its potential contribution to type 2 diabetes.

Main Methods:

  • Examined PGC-1alpha mRNA and protein levels in islets from diabetic animal models.
  • Utilized adenovirus-mediated expression of PGC-1alpha in isolated islets and live mice.
  • Analyzed changes in metabolic gene expression and insulin secretion.

Main Results:

  • PGC-1alpha levels were significantly elevated in islets of diabetic animal models.
  • Overexpression of PGC-1alpha inhibited glucose-stimulated insulin secretion.
  • Observed altered expression of key metabolic genes, including glucose-6-phosphatase, GLUT2, glucokinase, and glycerol-3-phosphate dehydrogenase.
  • Demonstrated blunted glucose-induced ATP production and impaired calcium influx, leading to reduced insulin exocytosis.

Conclusions:

  • PGC-1alpha plays a critical functional role in pancreatic beta cells.
  • Elevated PGC-1alpha is implicated in the pathogenesis of the diabetic phenotype by disrupting normal beta cell function and insulin secretion.

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