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Related Experiment Videos

Human type 2 diabetes: morphological evidence for abnormal beta-cell function.

C Sempoux1, Y Guiot, D Dubois

  • 1Department of Pathology, Université Catholique de Louvain, Brussels, Belgium.

Diabetes
|March 29, 2001
PubMed
Summary
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Amyloid deposits in pancreatic islets do not significantly impair beta-cell function in most type 2 diabetes patients. Beta-cells maintain insulin production and storage despite amyloid infiltration, suggesting it

Area of Science:

  • Endocrinology
  • Pathology
  • Cell Biology

Background:

  • The precise cause of beta-cell dysfunction in type 2 diabetes (T2D) remains elusive.
  • While reduced beta-cell mass is debated, islet amyloid deposits are observed in T2D patients and normoglycemic individuals.
  • Amyloid's impact on beta-cell function, specifically transcription and translation, requires in situ investigation.

Purpose of the Study:

  • To investigate the in situ effect of islet amyloid deposits on beta-cell transcription and translation in type 2 diabetic patients.
  • To determine if amyloid infiltration impacts proinsulin production, insulin gene transcription, and insulin storage.

Main Methods:

  • Autopsy-obtained pancreases from 41 type 2 diabetic and 28 normoglycemic subjects were analyzed.
  • Histological staining (Hemaluneosin, Congo red) identified islet morphology and amyloid deposits.

Related Experiment Videos

  • Immunohistochemistry and in situ hybridization assessed proinsulin and insulin mRNA expression and insulin storage.

    • Main Results:

    • Islet amyloid deposits were present in 57% of diabetic and 33% of normoglycemic subjects, with variable infiltration percentages.
    • Beta-cells within amyloid-infiltrated islets showed active Golgi proinsulin labeling, indicating ongoing synthesis.
    • Despite a modest reduction (≤16%) in proinsulin mRNA in amyloid-containing islets, insulin storage remained statistically normal.

    Conclusions:

    • Beta-cells within amyloid-infiltrated islets maintain active insulin transcription and translation.
    • Normal insulin storage persists even in the presence of islet amyloid deposits.
    • Given the limited amyloid infiltration in most cases and the modest mRNA reduction, islet amyloid is unlikely a primary driver of T2D pathogenesis.