Marked increase of insulin gene transcription by suppression of the Rho/Rho-kinase pathway

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Updated: Jul 19, 2026

Studying the Hypothalamic Insulin Signal to Peripheral Glucose Intolerance with a Continuous Drug Infusion System into the Mouse Brain
08:32

Studying the Hypothalamic Insulin Signal to Peripheral Glucose Intolerance with a Continuous Drug Infusion System into the Mouse Brain

Published on: January 4, 2018

Yumiko Nakamura1, Hideaki Kaneto, Takeshi Miyatsuka

  • 1Department of Internal Medicine and Therapeutics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan.

Biochemical and Biophysical Research Communications
|September 26, 2006
PubMed

Insights

Rho/Rho-kinase is activated in pancreatic beta-cells during diabetes, suppressing insulin production. Inhibiting this pathway boosts insulin gene transcription, offering a potential therapeutic strategy for type 2 diabetes.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Cell Biology

Background:

  • Type 2 diabetes is characterized by pancreatic beta-cell dysfunction and insulin resistance.
  • The role of Rho/Rho-kinase signaling in beta-cell function was previously unknown.
  • Rho/Rho-kinase is implicated in insulin signaling, insulin resistance, and glucose homeostasis.

Purpose of the Study:

  • To investigate the role of the Rho/Rho-kinase pathway in pancreatic beta-cell function.
  • To determine if Rho/Rho-kinase influences insulin biosynthesis and secretion.

Main Methods:

  • Immunostaining to detect RhoA expression in beta-cells.
  • Evaluation of Rho-kinase inhibitors (Y-27632, fasudil) on insulin biosynthesis.
  • Northern blot analysis to measure insulin mRNA levels.
  • Luciferase reporter gene assay to assess insulin promoter activity.

Main Results:

  • RhoA expression was higher in beta-cells of diabetic mice.
  • Rho-kinase inhibitors significantly increased insulin mRNA levels in beta-cell lines.
  • Inhibition of Rho-kinase enhanced insulin promoter activity, correlating with increased insulin mRNA.

Conclusions:

  • Rho/Rho-kinase is activated in beta-cells under diabetic conditions, contributing to suppressed insulin expression.
  • Suppression of the Rho/Rho-kinase pathway enhances insulin gene transcription.
  • Targeting the Rho/Rho-kinase pathway may represent a novel therapeutic approach to augment insulin production in diabetes.

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