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Related Experiment Videos

Fatty acids decrease IDX-1 expression in rat pancreatic islets and reduce GLUT2, glucokinase, insulin, and

S Gremlich1, C Bonny, G Waeber

  • 1Institute of Pharmacology and Toxicology, University of Lausanne, 27, Rue du Bugnon, CH-1005 Lausanne, Switzerland. Bernard.Thorens@ipharm.unil.ch

The Journal of Biological Chemistry
|December 31, 1997
PubMed
Summary

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High fatty acid levels reduce islet/duodenum homeobox-1 (IDX-1) expression, impacting pancreatic gene expression and hormone secretion. This suggests IDX-1 regulation is key to fatty acid-induced pancreatic defects.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Cell Biology

Background:

  • IDX-1 (islet/duodenum homeobox-1) is a crucial transcription factor for pancreatic development and function.
  • IDX-1 regulates key genes like Glut2, glucokinase, insulin, and somatostatin.
  • Pancreatic islet dysfunction is linked to metabolic disorders, including those influenced by fatty acids.

Purpose of the Study:

  • To investigate the effect of palmitic acid on IDX-1 expression and function in rat pancreatic islets.
  • To determine how palmitic acid-induced changes in IDX-1 affect the expression of its target genes.
  • To elucidate the impact of fatty acids on overall pancreatic islet hormone synthesis and secretion.

Main Methods:

  • Isolated rat pancreatic islets were exposed to palmitic acid.

Related Experiment Videos

  • IDX-1 mRNA, protein expression, and DNA binding activity were measured.
  • Expression levels of target genes (Glut2, glucokinase, insulin, somatostatin, glucagon) were assessed.
  • Total islet hormone content and release were quantified.

    • Main Results:

    • Palmitic acid significantly decreased IDX-1 mRNA, protein, and binding activity.
    • This decrease was dependent on mitochondrial oxidation of palmitic acid.
    • Expression of GLUT2, glucokinase, insulin, and somatostatin genes decreased, while glucagon expression was unaffected.
    • Islet hormone content for insulin, somatostatin, and glucagon decreased, but glucagon secretion was markedly increased.

    Conclusions:

    • Elevated fatty acid levels negatively regulate IDX-1 expression in pancreatic islets.
    • IDX-1 downregulation leads to decreased expression of key metabolic and hormonal genes.
    • Fatty acids induce significant alterations in pancreatic islet function, including increased glucagon secretion, with IDX-1 acting as an early regulatory event.