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Oxidative stress and the JNK pathway as a potential therapeutic target for diabetes

Hideaki Kaneto1, Dan Kawamori, Yoshihisa Nakatani

  • 1Department of Internal Medicine and Therapeutics, Osaka University Graduate School of Medicine, Osaka, Japan. kaneto@medone.med.osaka-u.ac.jp.

Drug News & Perspectives
|October 30, 2004
PubMed

Insights

Diabetic oxidative stress impairs pancreatic beta-cell function by reducing insulin gene expression. Antioxidant treatment improved glucose tolerance and beta-cell mass in diabetic mice, suggesting a therapeutic target.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Diabetes Research

Background:

  • Diabetic conditions generate oxidative stress, contributing to pancreatic beta-cell dysfunction.
  • Beta-cells are susceptible to oxidative stress due to diminished antioxidant enzyme expression.

Purpose of the Study:

  • To investigate the role of oxidative stress in diabetic beta-cell dysfunction.
  • To evaluate the therapeutic potential of antioxidants in ameliorating diabetes-related beta-cell impairment.

Main Methods:

  • Exposing beta-cell lines and isolated rat islets to oxidative stress.
  • Treating diabetic mice (C57BL/KsJ-db/db) with antioxidants.
  • Analyzing insulin gene expression, insulin content, insulin mRNA, and beta-cell mass.
  • Investigating the role of pancreatic and duodenal homeobox factor-1 (PDX-1) and the c-Jun N-terminal kinase (JNK) pathway.

Main Results:

  • Oxidative stress significantly decreased insulin gene expression in beta-cells.
  • Antioxidant treatment in diabetic mice improved glucose tolerance and increased beta-cell mass.
  • Antioxidant therapy preserved insulin content and insulin mRNA levels.
  • PDX-1 nuclear expression was enhanced by antioxidants, while oxidative stress induced PDX-1 translocation via JNK activation, suppressing insulin gene expression.

Conclusions:

  • Oxidative stress and subsequent JNK pathway activation contribute to beta-cell dysfunction in diabetes.
  • Targeting oxidative stress and the JNK pathway presents a potential therapeutic strategy for diabetes management.

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