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Isolated Pancreatic Islet Treatment and Apoptosis Measurement
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Beta-cell selective K(ATP)-channel activation protects beta-cells and human islets from human islet amyloid

Robert A Ritzel1, Sajith Jayasinghe, John B Hansen

  • 1Larry Hillblom Islet Research Center, UCLA David Geffen School of Medicine, Los Angeles, CA 90095-7073, USA. Robert.Ritzel@klinikum-muenchen.de

Regulatory Peptides
|July 13, 2010
PubMed
Abstract

Insights

Beta-cell rest, induced by K(ATP)-channel openers, protects against human islet amyloid polypeptide (h-IAPP) induced apoptosis in type 2 diabetes. This strategy may prevent beta-cell loss and deficiency.

Area of Science:

  • Endocrinology
  • Cell Biology
  • Diabetes Research

Background:

  • Type 2 diabetes mellitus (T2DM) involves chronic beta-cell stimulation and toxic human islet amyloid polypeptide (h-IAPP) oligomers.
  • These factors lead to beta-cell dysfunction and apoptosis, contributing to disease progression.

Purpose of the Study:

  • To investigate whether inducing beta-cell rest can prevent h-IAPP-induced beta-cell apoptosis.
  • To explore the therapeutic potential of beta-cell rest in T2DM.

Main Methods:

  • Beta-cell rest was induced using a selective K(ATP)-channel opener (K(ATP)CO) in RIN cells and human islets.
  • Apoptosis was quantified using time-lapse video microscopy and TUNEL staining.
  • Islet architecture was assessed over 48 hours using time-lapse video microscopy.

Main Results:

  • h-IAPP significantly induced apoptosis in both RIN cells and human islets.
  • Co-incubation with K(ATP)CO markedly inhibited h-IAPP-induced apoptosis (p<0.001).
  • K(ATP)CO reduced islet architecture disintegration by approximately 70% (p<0.05) without directly inhibiting amyloid formation.

Conclusions:

  • Opening K(ATP)-channels reduces beta-cell vulnerability to h-IAPP oligomer-induced apoptosis.
  • This protective effect is likely mediated by beta-cell membrane hyperpolarization, not direct interaction with h-IAPP.
  • Inducing beta-cell rest via K(ATP)-channel openers offers a potential strategy to protect beta-cells and prevent deficiency in T2DM.

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