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A High-content In Vitro Pancreatic Islet β-cell Replication Discovery Platform
Published on: July 16, 2016
G6PD up-regulation promotes pancreatic beta-cell dysfunction
Joo-Won Lee1, A Hyun Choi, Mira Ham
1Department of Biological Sciences, Seoul National University, San 56-1, Sillim-Dong, Kwanak-Gu, Seoul 151-742, Korea.
Endocrinology
|January 21, 2011
Summary
Increased glucose-6-phosphate dehydrogenase (G6PD) in pancreatic cells elevates reactive oxygen species (ROS), impairing insulin secretion and promoting apoptosis in type 2 diabetes.
Area of Science:
- Endocrinology
- Molecular Biology
- Metabolic Diseases
Background:
- Type 2 diabetes is characterized by pancreatic β-cell dysfunction.
- Reactive oxygen species (ROS) contribute to β-cell dysfunction.
- Glucose-6-phosphate dehydrogenase (G6PD) regulates cellular redox balance.
Purpose of the Study:
- To investigate the role of G6PD in β-cell dysfunction and ROS accumulation.
- To determine if G6PD variations impact β-cell gene expression in diabetes.
Main Methods:
- Examined G6PD expression in pancreatic islets of diabetic animal models (db/db mice, OLEFT rats).
- Assessed ROS levels, glucose-stimulated insulin secretion, and apoptosis in G6PD-overexpressing INS-1 cells and primary islets.
- Utilized small interference RNA to suppress G6PD expression.
Main Results:
- G6PD expression was upregulated in pancreatic islets of diabetic animals.
- G6PD overexpression increased ROS accumulation and prooxidative enzyme expression.
- Elevated G6PD reduced glucose-stimulated insulin secretion and induced β-cell apoptosis.
- G6PD suppression attenuated palmitate-induced β-cell apoptosis.
Conclusions:
- Upregulation of G6PD in pancreatic β-cells contributes to β-cell dysregulation.
- G6PD-induced ROS accumulation plays a key role in the development of type 2 diabetes.
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