title: Distribution of N(omega)-nitro-L-arginine following topical and intracerebroventricular administration in the rat.
abstract: The distribution of the nitric oxide synthase inhibitor, N(omega)-nitro-L-arginine (L-NA), in the rat brain following either topical or intracerebroventricular application was examined using 14C-labeled L-NA. Two hours after topical application, the concentration of L-NA 1 mm below the surface was approximately 20% of the concentration at the surface, and less than 3% at 2 mm below the cortical surface. L-NA infused into the lateral cerebral ventricle distributes only in regions in close proximity to the ventricle even 8 h after administration. Consequently, intracerebroventricular administration of nitric oxide synthase inhibitors may not be useful if global inhibition of nitric oxide synthase is desired.
authors.affiliation: Cerebrovascular Research Center, University of Pennsylvania, Philadelphia 19104-6063, USA. greenberg@cvrc.med.upenn.edu
authors.forename: J H
authors.initials: JH
authors.lastname: Greenberg
authors.forename: J
authors.initials: J
authors.lastname: Hamada
authors.forename: K
authors.initials: K
authors.lastname: Rysman
mesh_terms: D000287:Administration, Topical; D000818:Animals; D001345:Autoradiography; D002540:Cerebral Cortex; D004791:Enzyme Inhibitors / Q000008:administration & dosage / Q000493:pharmacokinetics*; D005260:Female; D007276:Injections, Intraventricular; D008297:Male; D019331:NG-Nitroarginine Methyl Ester / Q000008:administration & dosage / Q000493:pharmacokinetics*; D019001:Nitric Oxide Synthase / Q000037:antagonists & inhibitors*; D051381:Rats; D017208:Rats, Wistar
chemical_list: D004791:Enzyme Inhibitors; D019001:Nitric Oxide Synthase; D019331:NG-Nitroarginine Methyl Ester