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[Type 2 diabetes and beta cell apoptosis].

E Cerasi1, N Kaiser, G Leibowitz

  • 1Department of Endocrinology and Metabolism, Hebrew University, Hadassah Medical Center, Jerusalem, Israel.

Diabetes & Metabolism
|August 17, 2000
PubMed
Summary

Chronic hyperglycemia induces pancreatic beta cell apoptosis in the Psammomys obesus sand rat model, contributing to insulin deficiency in type 2 diabetes mellitus. This suggests hyperglycemia may drive beta cell loss in humans.

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Area of Science:

  • Endocrinology
  • Cell Biology
  • Pathophysiology

Context:

  • Type 2 diabetes mellitus (T2DM) involves insulin resistance and beta cell dysfunction.
  • Pancreatic beta cell loss, potentially via apoptosis, is increasingly recognized in T2DM.
  • The Psammomys obesus sand rat is a valuable model for T2DM, exhibiting insulin deficiency and beta cell reduction.

Purpose:

  • To investigate the role of hyperglycemia in pancreatic beta cell apoptosis in the Psammomys obesus model.
  • To explore the mechanisms underlying beta cell loss in T2DM.
  • To assess the potential involvement of advanced glycation products and nitric oxide in this process.

Summary:

  • High-calorie diets induce rapid diabetes in Psammomys obesus, characterized by a 14-fold increase in beta cell apoptosis within 20 days.

Related Experiment Videos

  • In vitro studies with isolated islets confirm that chronic hyperglycemia promotes beta cell apoptosis.
  • Aminoguanidine did not prevent apoptosis, suggesting advanced glycation products and nitric oxide are not primary mediators.

    • Impact:

    • Findings suggest chronic hyperglycemia directly contributes to beta cell destruction in T2DM.
    • This mechanism may explain severe insulin secretory deficiency observed in some human T2DM patients.
    • Maintaining normoglycemia could be crucial for preserving beta cell function and preventing T2DM complications.