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Related Experiment Videos

A critical role for nitric oxide in intestinal barrier function and dysfunction

I Alican1, P Kubes

  • 1Department of Medical Physiology, University of Calgary, Alberta, Canada.

The American Journal of Physiology
|February 1, 1996
PubMed
Summary
This summary is machine-generated.

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Nitric oxide (NO) protects mucosal barriers by maintaining blood flow and reducing inflammation. However, its role in chronic conditions like sepsis and inflammatory bowel disease (IBD) is complex and depends on the specific nitric oxide synthase (NOS) enzyme involved.

Area of Science:

  • Gastroenterology
  • Immunology
  • Physiology

Background:

  • Endogenous nitric oxide (NO) plays a crucial role in maintaining mucosal barrier integrity.
  • NO counteracts increased mucosal permeability during acute pathophysiological states.
  • Mechanisms include regulating blood flow, inhibiting leukocyte/platelet adhesion, modulating mast cells, and scavenging reactive oxygen species.

Purpose of the Study:

  • To review the protective mechanisms of NO in acute inflammation.
  • To examine the dual role of NO in chronic inflammatory conditions, specifically sepsis and inflammatory bowel disease (IBD).
  • To highlight the importance of distinguishing between different nitric oxide synthase (NOS) enzyme isoforms.

Main Methods:

  • Literature review of studies on nitric oxide (NO) and mucosal barrier function.

Related Experiment Videos

  • Analysis of data concerning both endogenous and exogenous NO sources.
  • Comparison of findings in acute versus chronic inflammatory models.

    • Main Results:

    • Constitutive NOS (cNOS)-derived NO and exogenous NO reduce acute inflammation.
    • Inducible NOS (iNOS)-derived NO may contribute to chronic inflammation in sepsis and IBD.
    • Inhibition of NO synthesis does not consistently protect in models of sepsis or IBD, suggesting a complex role.

    Conclusions:

    • NO is vital for mucosal barrier integrity and mitigating acute inflammation.
    • The role of NO in chronic inflammatory diseases like sepsis and IBD is complex and isoform-dependent.
    • Understanding the specific NOS enzyme involved is critical for therapeutic strategies.