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Related Experiment Videos

Nitric oxide and intestinal inflammation.

P Kubes1, D M McCafferty

  • 1Immunology Research Group, Department of Physiology and Biophysics, Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada.

The American Journal of Medicine
|September 1, 2000
PubMed
Summary

Nitric oxide (NO) plays a complex role in intestinal inflammation, acting as both beneficial and detrimental. Research explores the dual functions of nitric oxide synthase (NOS) isoforms and peroxynitrite in these conditions.

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Area of Science:

  • Gastroenterology
  • Immunology
  • Molecular Biology

Background:

  • Intestinal inflammation, including sepsis and inflammatory bowel diseases, presents significant clinical challenges with poorly understood mechanisms.
  • Nitric oxide (NO), a molecule produced by nitric oxide synthase (NOS), has emerged as a key player in intestinal inflammation, exhibiting a dichotomous role.

Purpose of the Study:

  • To review the multifaceted roles of constitutive NOS (cNOS) and inducible NOS (iNOS) in the context of intestinal inflammation.
  • To provide an overview of the involvement of peroxynitrite in intestinal inflammation, addressing existing controversies and challenging established paradigms.

Main Methods:

  • Literature review synthesizing current research on nitric oxide synthase isoforms and peroxynitrite in intestinal inflammation.

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  • Analysis of studies investigating the proposed dichotomous roles of NO and the generation of peroxynitrite.

    • Main Results:

    • Constitutively expressed NOS (nNOS and eNOS) is crucial for normal intestinal physiology; its inhibition leads to damage.
    • Inducible NOS (iNOS) has been traditionally associated with injury via peroxynitrite formation, but recent evidence suggests potential protective roles in certain inflammatory models.
    • The significance of peroxynitrite in mediating iNOS-induced injury is increasingly questioned.

    Conclusions:

    • The role of NO in intestinal inflammation is complex and not fully explained by a simple beneficial/detrimental dichotomy.
    • Further research is needed to clarify the precise functions of cNOS and iNOS isoforms and the impact of peroxynitrite in various inflammatory conditions of the intestine.