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How cytotoxic is nitric oxide?

M P Gordge1

  • 1Institute of Urology and Nephrology, University College London, UK. m.gordge@ucl.ac.uk

Experimental Nephrology
|April 2, 1998
PubMed
Summary
This summary is machine-generated.

Nitric oxide (NO) acts as both a vital signaling molecule and a toxic mediator. High concentrations of NO, often from nitric oxide synthase, can cause cellular injury through various mechanisms.

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Area of Science:

  • Biochemistry
  • Cellular Biology
  • Toxicology

Background:

  • Nitric oxide (NO) exhibits dual roles, functioning as a physiological signaling molecule and a toxic mediator.
  • Cellular damage from NO involves mechanisms like mitochondrial dysfunction, enzyme inhibition, lipid peroxidation, and genetic mutations.

Purpose of the Study:

  • To elucidate the dual action of nitric oxide (NO) in biological systems.
  • To detail the mechanisms underlying NO-mediated cellular toxicity.

Main Methods:

  • Review of biochemical pathways involving nitric oxide.
  • Analysis of cellular responses to varying NO concentrations.
  • Investigation of reactive intermediates formed by NO.

Main Results:

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  • NO's signaling capacity is distinct from its toxic effects, which manifest at higher concentrations.
  • Toxicity is mediated by reactive intermediates like N2O3 and peroxynitrite.
  • Significant toxicity typically arises from induced nitric oxide synthase activity.

Conclusions:

  • Understanding NO's dual role is crucial for both physiological and pathological contexts.
  • Controlling NO production, particularly via nitric oxide synthase, is key to mitigating its toxic effects.