Effects of a nitric oxide synthase inhibitor on hypophagia induced by the peripheral 5-HT receptor agonists, alpha-methyl-5-hydroxytryptamine and 5-carboxamidotryptamine in rats.
We investigated the effects of the nitric oxide (NO) synthase inhibitor, N(G)-nitro-L-arginine methyl ester (L-NAME) on hypophagia in rats elicited by alpha-methyl-5-hydroxytryptamine (alpha-methyl-5-HT) and 5-carboxamidotryptamine (5-CT) which are suggested to be mediated by the peripheral 5-HT2A and 5-HT7 receptor, respectively. Both alpha-methyl-5-HT and 5-CT apparently inhibited food intake in food-deprived rats. L-NAME significantly enhanced alpha-methyl-5-HT-elicited hypophagia, while it inhibited 5-CT-elicited hypophagia. These results suggest that NO is differentially related to alpha-methyl-5-HT and 5-CT-induced hypophagia and that NO may play a role in hypo- and hyperphagia.
Sugimoto
Y
Y
Department of Pharmacology, Kobe Pharmaceutical University, Japan. yumisugi@kobepharma-u.ac.jp
Noma
T
T
Yoshikawa
T
T
Yamada
J
J
D000818:Animals; D004435:Eating / Q000187:drug effects* / Q000523:psychology; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D005508:Food Deprivation / Q000502:physiology; D008297:Male; D019331:NG-Nitroarginine Methyl Ester / Q000494:pharmacology*; D009569:Nitric Oxide / Q000502:physiology; D019001:Nitric Oxide Synthase / Q000037:antagonists & inhibitors*; D051381:Rats; D017207:Rats, Sprague-Dawley; D044402:Receptor, Serotonin, 5-HT2A; D011985:Receptors, Serotonin / Q000502:physiology; D012701:Serotonin / Q000031:analogs & derivatives* / Q000494:pharmacology*; D017366:Serotonin Receptor Agonists / Q000494:pharmacology*
D004791:Enzyme Inhibitors; D044402:Receptor, Serotonin, 5-HT2A; D011985:Receptors, Serotonin; D017366:Serotonin Receptor Agonists; C104425:serotonin 7 receptor; C042390:alpha-methylserotonin; D009569:Nitric Oxide; D012701:Serotonin; C047087:5-carboxamidotryptamine; D019001:Nitric Oxide Synthase; D019331:NG-Nitroarginine Methyl Ester