Abstract
Automutilation induced by a single large dose of clonidine was potentiated by pretreatment with methamphetamine, caffeine and theophylline, while it was inhibited by acute administration of reserpine, α-methyl-p-tyrosine, phenoxybenzamine, phentolamine and chlorpromazine. l-Dopa, 5-hydroxytryptophan and p-chlorophenylalanine had no effect on this abnormal behavior. Biochemical studies on brain monoamines revealed that noradrenaline was markedly increased and dopamine slightly so, but 5-hydroxytryptamine was never changed by clonidine. These results suggest that a central noradrenergic system may be involved in automutilation induced by clonidine in mice.
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