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High-resolution Respirometry to Measure Mitochondrial Function of Intact Beta Cells in the Presence of Natural Compounds
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Suppression of NADPH oxidase 2 substantially restores glucose-induced dysfunction of pancreatic NIT-1 cells

Huiping Yuan1, Yonggang Lu, Xiuqing Huang

  • 1Peking University Fifth School of Clinical Medicine (Beijing Hospital), Beijing, China.

The FEBS Journal
|November 16, 2010
PubMed

Insights

Reactive oxygen species (ROS) generated by NADPH oxidase 2 (NOX2) contribute to type 2 diabetes by impairing pancreatic beta-cell function and insulin secretion. Reducing NOX2 levels can restore beta-cell function in high glucose conditions.

Area of Science:

  • Endocrinology
  • Cell Biology
  • Metabolic Disease Research

Background:

  • Type 2 diabetes is characterized by impaired insulin secretion and insulin resistance.
  • Excessive reactive oxygen species (ROS) generation is linked to glucose-induced beta-cell dysfunction.
  • The precise cellular mechanisms of ROS generation and their role in beta-cell dysfunction remain unclear.

Purpose of the Study:

  • To investigate the role of NADPH oxidase 2 (NOX2)-derived ROS in high glucose-induced pancreatic beta-cell dysfunction.
  • To elucidate the signaling pathways involved in NOX2-mediated beta-cell damage.

Main Methods:

  • Induction of diabetes in Sprague-Dawley rats using a high-fat diet.
  • In vitro studies using pancreatic NIT-1 cells exposed to high glucose concentrations.
  • Assessment of ROS generation, NOX2 expression, insulin secretion, and apoptosis.
  • Utilized siRNA to reduce NOX2 expression and investigated downstream signaling pathways including p38MAPK, p53, PTEN, JNK, AKT/PKB, FOXO1, and PDX1.

Main Results:

  • Diabetic rats exhibited hyperglycemia, elevated ROS, and reduced pancreatic insulin content.
  • High glucose increased ROS and NOX2 expression in NIT-1 cells.
  • NOX2 reduction via siRNA rescued glucose-induced insulin secretion and expression.
  • High glucose induced beta-cell apoptosis and dysfunction via p38MAPK, p53, PTEN-dependent JNK activation, and AKT inhibition, leading to altered FOXO1 and PDX1 translocation.

Conclusions:

  • NOX2-derived ROS play a critical role in high glucose-induced beta-cell dysfunction.
  • The mechanism involves PTEN-dependent JNK activation and AKT inhibition, impacting insulin expression and secretion.
  • Targeting NOX2 may offer a therapeutic strategy for type 2 diabetes.

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