[Analysis of the neurochemical mechanisms of the psychotropic action of tuftsin and its analogs].

A study was made of the central effects of tuftsin (Thr-Lys-Pro-Arg) and its analogs (Leu1-tuftsin, D-Arg4-tuftsin) on the dopamine-dependent behavior and tyrosine hydroxylase (TH) activity. It was shown that the absence of direct effect of tuftsin and Leu1-tuftsin on postsynaptic dopaminergic receptors, revealed in experimental rotational behavior, correlates with a decrease in TH activity in the rat hypothalamus and striatum. Depression of the rotational behavior and increased activity of TH under the effect of D-Arg4-tuftsin suggest that this analog can modulate postsynaptic dopaminergic receptors by the antagonism type.