Shah NS, Hedden MP. Behavioral effects and metabolic fate of N,N-dimethyltryptamine in mice pretreated with beta-diethylaminoethyl-diphenylpropylacetate (SKF 525-A), improniazid and chlorpromazine.
Pharmacol Biochem Behav 1978;
8:351-6. [PMID:
276891 DOI:
10.1016/0091-3057(78)90070-9]
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Abstract
Behavioral aspects and metabolic fate of N,N-dimethyltryptamine (DMT) were studied in mice pretreated with beta-diethylaminoethyl-diphenylpropylacetate (SKF 525-A), iproniazid or chlorpromazine (CPZ). DMT at doses of 2.5, 10.0, and 25.0 mg/kg produced several behavioral changes in a dose-related manner: inhibition of spontaneous locomotor movement, enhanced fright responses to sound stimuli, trembling, head twitching, inco-ordinated movements of hind-legs, flat or extended tail and abnormal posture with the extension of hind-legs. Pretreatment with ipromazid (153 mg/kg; 4 hr) but not SKF 525-A (50 mg/kg; 1 hr) prolonged the behavioral effects produced by 2.5 mg/kg DMT while CPZ (15 mg/kg; 0.5 hr) completely abolished the responses induced by 25 mg/kg DMT. Earlier behavioral effects generally coincided with the brain concentrations of DMT. Dose-dependent increases with rapid uptake and disappearance in the brain, plasma and hepatic levels of DMT were measured with doses of 10 and 25 mg/kg DMT. Iproniazid but not SKF 525-A markedly enhanced tissue levels of DMT. it is concluded that DMT is metabolized chiefly by monoamine oxidase rather than by drug-metabolizing hepatic microsomal enzymes and that DMT-induced behavioral effects are due to the parent compound rather than its metabolite.
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