Nitric oxide synthase: irreversible inhibition by L-NG-nitroarginine in brain in vitro and in vivo

Biochem Biophys Res Commun. 1991 May 15;176(3):1136-41. doi: 10.1016/0006-291x(91)90403-t.


Inhibition of nitric oxide (NO) synthase activity by L-NG-Nitroarginine (NO2Arg) in brain preparations is not reversed by dialysis and is enhanced by prolonged preincubation of NO2Arg with the enzyme. By contrast, the weaker inhibition by NO2Arg of macrophage NO synthase is fully reversible. NO2Arg inhibits NO synthase activity in the brain after i.p. administration of 5 or 50 mg/kg. This in vivo inhibition also appears to be irreversible. The potent in vivo inhibition of central NO synthase by NO2Arg may facilitate studies of the physiologic function of NO as a neuronal messenger.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Amino Acid Oxidoreductases / antagonists & inhibitors*
  • Animals
  • Arginine / analogs & derivatives*
  • Arginine / pharmacology
  • Cerebellum / enzymology*
  • Interferon-gamma / pharmacology
  • Kinetics
  • Macrophage Activation
  • Macrophages / drug effects
  • Macrophages / enzymology
  • Macrophages / physiology
  • Male
  • Nitric Oxide Synthase
  • Nitroarginine
  • Rats
  • Rats, Inbred Strains
  • Recombinant Proteins
  • Reference Values


  • Recombinant Proteins
  • Nitroarginine
  • Interferon-gamma
  • Arginine
  • Nitric Oxide Synthase
  • Amino Acid Oxidoreductases