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Nitric oxide: an ubiquitous messenger

A Berdeaux1

  • 1Département de Pharmacologie, Faculté de Médecine Paris-Sud, Le Kremlin-Bicêtre, France.

Fundamental & Clinical Pharmacology
|January 1, 1993
PubMed
Summary

Nitric oxide (NO), produced by nitric oxide synthase (NOS), plays key roles in vascular homeostasis and neuronal functions. Different NOS isoforms are involved in physiological and pathophysiological processes, offering therapeutic targets.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Physiology

Background:

  • Nitric oxide (NO) is a critical signaling molecule involved in vascular tone, homeostasis, and neuronal/immunological functions.
  • Endogenous NO is synthesized from L-arginine by nitric oxide synthase (NOS) enzymes.
  • Several NOS isoforms have been identified, each with distinct characteristics and roles.

Purpose of the Study:

  • To elucidate the roles and regulation of different nitric oxide synthase (NOS) isoforms.
  • To highlight the involvement of the L-arginine-NO pathway in various physiological and pathophysiological conditions.
  • To emphasize the therapeutic potential of targeting NOS isoforms.

Main Methods:

  • Review of experimental evidence identifying nitric oxide (NO) as endothelial-derived relaxing factor (EDRF).
  • Isolation, purification, and cloning of various nitric oxide synthase (NOS) isoforms.
  • Characterization of NOS isoform regulation, co-factors, and functional roles.

Main Results:

  • Constitutive NOS isoforms (Type I and III) are Ca(2+)-calmodulin dependent, producing picomolar NO for neurotransmission and vascular tone control.
  • Inducible NOS isoforms (Type II and IV) are Ca(2+)-calmodulin independent, producing nanomolar NO as an immune defense mechanism.
  • Dysfunctions in the L-arginine-NO pathway are implicated in diseases like atherosclerosis, hypertension, and diabetes.

Conclusions:

  • Nitric oxide (NO) is a versatile messenger with diverse physiological roles mediated by distinct NOS isoforms.
  • Understanding the differential regulation and function of NOS isoforms is crucial for comprehending disease pathophysiology.
  • Selective modulation of NOS isoforms presents a promising therapeutic strategy for various diseases.

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