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Exogenous nitric oxide inhibits IRS-1 expression in rat hepatocytes and skeletal myocytes

Simone Badal1, Paul D Brown, Dalip Ragoobirsingh

  • 1Department of Basic Medical Sciences (Biochemistry section), University of the West Indies, Kingston, Jamaica.

Journal of Biomedical Science
|February 14, 2006
PubMed

Insights

Nitric oxide (NO) significantly reduces insulin receptor substrate-1 (IRS-1) levels in liver and muscle cells. This suggests NO may contribute to the development of type 2 diabetes.

Area of Science:

  • Biochemistry
  • Endocrinology
  • Physiology

Background:

  • Nitric oxide (NO) plays diverse roles in physiological and pathological processes.
  • Insulin receptor substrate-1 (IRS-1) is crucial for insulin signaling in liver and skeletal muscle.

Purpose of the Study:

  • To investigate the potential diabetogenic effects of nitric oxide (NO).
  • To examine the impact of exogenous NO on IRS-1 expression in rat hepatocytes and skeletal myocytes.

Main Methods:

  • Treatment of rat hepatocytes and skeletal myocytes with NO-donating agents (SNAP, GSNO).
  • Measurement of IRS-1 levels following NO exposure.
  • Utilized NO scavenger (carboxy-PTIO) to assess reversibility.

Main Results:

  • Exogenous NO donors significantly reduced IRS-1 levels in both cell types compared to insulin-stimulated controls.
  • S-nitroso-N-acetylpenicillamine (SNAP) demonstrated greater potency.
  • Skeletal myocytes exhibited higher sensitivity to NO's inhibitory effects.
  • NO scavenger partially reversed the reduction in IRS-1 levels.

Conclusions:

  • Exogenous NO potently modulates insulin-mediated signal transduction.
  • These findings support a significant role for NO in the pathogenesis of type 2 diabetes mellitus.

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