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Nitric oxide and soman poisoning.

Y X Wang1, M J Sun

  • 1Institute of Pharmacology and Toxicology, Academy of Military Medical Sciences, Beijing, China.

Zhongguo Yao Li Xue Bao = Acta Pharmacologica Sinica
|June 22, 1999
PubMed
Summary
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Nitric oxide (NO) plays a role in soman toxicity. Enhancing NO with L-arginine worsened soman poisoning, while inhibiting NO with NAME protected mice.

Area of Science:

  • Neuroscience
  • Toxicology
  • Biochemistry

Background:

  • Soman is an organophosphate nerve agent.
  • Nitric oxide (NO) is a signaling molecule with diverse physiological roles.
  • The involvement of NO in soman toxicity is not fully understood.

Purpose of the Study:

  • To investigate the role of the nitric oxide (NO) signaling pathway in the toxicity induced by soman.
  • To determine if modulating NO levels affects soman poisoning outcomes in a mouse model.

Main Methods:

  • Mice were pretreated with L-arginine (Arg), a substrate for nitric-oxide synthase (NOS), or NG-nitro-L-arginine methyl ester (NAME), a NOS inhibitor.
  • Seizure latency and mortality rates were assessed after soman exposure.
  • Brain NOS activity was measured in soman-intoxicated mice.

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Main Results:

  • L-arginine pretreatment decreased seizure latency and increased mortality in a dose-dependent manner.
  • NAME pretreatment increased seizure latency and decreased mortality, dose-dependently.
  • Soman intoxication elevated NOS activity in the cerebrum, cerebellum, and hippocampus.

Conclusions:

  • The nitric oxide (NO) messenger system is implicated in the seizure onset and mortality associated with soman poisoning.
  • Modulation of NO pathways can significantly alter the course of soman toxicity.
  • These findings suggest NO as a potential therapeutic target for soman poisoning.