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- W2061646219 abstract "The head shake response in rats after systemic administration of the serotonin (5HT) precursor 5-hydroxytryptophan (5HTP) was pharmacologically characterized and shown to be a useful animal model to quantify brain 5HT receptor activation. The behavior occurred in a dose-dependent manner after injection of 5HTP and the 5HT agonist quipazine. Head shakes were also observed after injection of L-tryptophan, 5-methoxydimethyltryptamine and fenfluramine. The 5HT antagonists cyproheptadine and metergoline were potent blockers of the response. Xylamidine, a peripheral 5HT antagonist, had no effect on head shaking. Inhibition of 5HT uptake with fluoxetine potentiated the head shake response after 5HTP. Manipulation of central cholinergic or GABAergic mechanisms did not alter 5HTP-induced shakes. Alpha-noradrenergic receptor blockade had no significant effect on head shakes. However, desmethylimipramine was equipotent with methysergide as an antagonist of the behavior. Beta-noradrenergic receptor blockade had no specific effect on 5HTP head shakes. Concomitant dopamine receptor activation with SK&F 38393 did not affect head shakes but the neuroleptics chlorpromazine and pimozide reduced the number of head shakes after 5HTP. The H1 receptor antagonist pyrilamine had no effect on head shakes. It is concluded that 5HTP-induced head shakes in rats is a quantitative model of brain 5HT receptor activation which is particularly sensitive to 5HT antagonists." @default.
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- W2061646219 date "1980-04-01" @default.
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- W2061646219 title "Pharmacological profile of a model for central serotonin receptor activation" @default.
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- W2061646219 doi "https://doi.org/10.1016/0024-3205(80)90042-9" @default.
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