The effect of agents stimulating dopaminergic system on incorporation of exogenous adenine into striate body slices of the rat.

We tested the effect of various concentrations (10(-6)--10(-4) M) of dopamine (DA), apomorphine (APM), amantadine (AMD), dimethylaminoadamantane (DMAD) and haloperidol (HP) on in vitro incorporation of 14C/U/adenine to slices of the rat striate body. Two mechanisms participated in this incorporation: one of them (uptake I) of Km = 1.92 micron, the second (uptake II) of Km 434 micron, APM inhibited both uptake I and II, while AMD and DMAD only the uptake I. HP at concentration inhibiting the dopaminergic receptors did not affect the inhibition by APM, AMD or DMAD of incorporation of exogenous adenine to striatal slices. Incorporation of exogenous adenine was not related to stimulation by specific (DA) or unspecific (APM, AMD, DMAD) stimulants of dopaminergic receptors in the rat striate body. The inhibition of the uptake produced by APM, AMD and DMAD may be related to the mechanism of action of these compounds.