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Abstract
Ethanol-induced sleep time was measured in mice after administration of L-3,4-dihydroxyphenylalanine (L-DOPA), L-tryptophan (L-TP), DL-5-hydroxytryptophan (5-HTP), serotonin (5HT), DL-5-hydroxyindole-3-acetic acid (5HIAA), and DL-parachlorophenylalanine (pCPA), a serotonin depletor. The pCPA administration, with concomitant reduction of brain serotonin, had no effect on ethanol-induced sleep; TP, 5-HTP and 5HIAA failed also to significantly enhance ethanol sleep in mice. However, serotonin significantly enhanced sleeping time of mice administered an ineffective dose of ethanol. Pretreatment with L-DOPA produced a marked prolongation of ethanol narcosis with a concomitant large increase in whole brain dopamine (DA). Administration of L-DOPA and pCPA, together, produced a smaller augmentation of ethanol effects.
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