Involvement of Oxidative Stress and the JNK Pathway in Glucose Toxicity

Article View

Abstract
The Review of Diabetic Studies,2004,1,4,165-174.
Published:February 2005
Type:Review Article
Authors:
Author(s) affiliations:

Hideaki Kaneto, Yoshihisa Nakatani, Dan Kawamori, Takeshi Miyatsuka, and Taka-aki Matsuoka

Department of Internal Medicine and Therapeutics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan

Abstract:

The hallmark of type 2 diabetes is pancreatic β-cell dysfunction and insulin resistance. Normal β-cells can compensate for insulin resistance by increasing insulin secretion, but insufficient compensation leads to the onset of glucose intolerance. Once hyperglycemia becomes apparent, β-cell function gradually deteriorates and insulin resistance becomes aggravated. Such phenomena are collectively called “glucose toxicity”. Under diabetic conditions, oxidative stress is induced and the JNK pathway is activated, which is involved in “glucose toxicity”. Activation of the JNK pathway suppresses insulin biosynthesis and interferes with insulin action. Indeed, suppression of the JNK pathway in diabetic mice improves insulin resistance and ameliorates glucose tolerance. Consequently, the JNK pathway plays a crucial role in the progression of pancreatic β-cell dysfunction and insulin resistance and thus could be a potential therapeutic target for the “glucose toxicity” found in diabetes.