Neurochemical Research

, Volume 18, Issue 10, pp 1063–1066 | Cite as

Chronic administration of a nitric oxide synthase inhibitor, Nω-nitro-l-arginine, and drug-induced increase in cerebellar cyclic GMP in vivo

  • M. Bansinath
  • B. Arbabha
  • H. Turndorf
  • U. C. Garg
Original Articles


Nω-nitro-l-arginine (NG-nitro-l-arginine) is a potent nitric oxide synthase inhibitor which crosses the blood brain barrier and does not undergo extensive metabolism in vivo. In this study, effect of chronic pretreatment of Nω-nitro-l-arginine (75 mg/kg, i.p., twice daily for 7 days) on the harmaline- (100 mg/kg, s.c.), picrotoxin- (4 mg/kg, s.c.), pentylenetetrazole- (50 mg/kg, i.p.), andl-glutamic acid- (400 μg/10 μl/mouse, i.c.v.) induced increase in cerebellar cGMP was assessed. All the four drugs produced significant increase in cerebellar cGMP in vehicle pretreated control animals. Cerebellar cGMP increase induced by harmaline, picrotoxin, andl-glutamic acid was attentuated in Nω-nitro-l-arginine pretreated animals. These results indicate that in vivo cerebellar cGMP levels are increased by the prototype excitatory amino acid receptor agonist,l-glutamic acid and also by the drugs which augment the excitatory amino acid transmission. Furthermore, parenteral chronic administration of Nω-nitro-l-arginine blocks NO synthase in the brain and hence cerebellar cGMP response in chronic Nω-nitro-l-arginine treated animals could be used as a tool to assess the physiological functions of nitric oxide in vivo.

Key Words

Nitric oxide Nω-nitro-l-arginine NO synthase cGMP harmaline picrotoxin 


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Copyright information

© Plenum Publishing Corporation 1993

Authors and Affiliations

  • M. Bansinath
    • 1
  • B. Arbabha
    • 1
  • H. Turndorf
    • 1
  • U. C. Garg
    • 1
  1. 1.Department of AnesthesiologyNew York University Medical CenterNew York

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