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[Fatty acids and beta cells].

J Girard1

  • 1Service de Biochimie et Pharmacologie, Hôpital Saint-Vincent de Paul, Paris.

Diabetes & Metabolism
|August 17, 2000
PubMed
Summary
This summary is machine-generated.

In type 2 diabetes, fatty acids initially boost insulin secretion but chronic exposure impairs it by altering gene expression. Preventing fatty acid buildup in beta cells may preserve insulin function and delay diabetes.

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Area of Science:

  • Endocrinology
  • Molecular Biology
  • Metabolic Diseases

Background:

  • Insulin secretory deficiency in beta cells is key in type 2 diabetes development.
  • Fatty acids influence beta cell function, impacting insulin secretion.
  • Understanding fatty acid effects on beta cells is crucial for diabetes research.

Purpose of the Study:

  • To elucidate the dual role of fatty acids in glucose-dependent insulin secretion.
  • To investigate the mechanisms behind fatty acid-induced beta cell dysfunction.
  • To explore therapeutic strategies targeting lipotoxicity in type 2 diabetes.

Main Methods:

  • In vitro and in vivo studies in human and rodent models.
  • Analysis of beta cell gene expression, including PPARs, CPT-1, and acetyl carboxylase.

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  • Assessment of insulin secretion, ATP availability, and IP3 production.
  • Evaluation of triglyceride accumulation and apoptosis in beta cells.

    • Main Results:

    • Short-term fatty acid exposure (< 24h) enhances glucose-dependent insulin secretion.
    • Chronic fatty acid exposure (> 24h) reduces insulin secretion via PPAR-mediated gene expression changes.
    • Fatty acids alter mitochondrial fatty acid oxidation and extramitochondrial signaling pathways.
    • Increased triglyceride accumulation in beta cells correlates with reduced insulin secretion and apoptosis.

    Conclusions:

    • Fatty acid metabolism in beta cells has distinct short-term and long-term effects on insulin secretion.
    • Chronic lipotoxicity impairs beta cell function and promotes diabetes progression.
    • Targeting and preventing intracellular lipid accumulation offers a potential therapeutic strategy for type 2 diabetes.