Effects of the D2-like receptor alkylating agent NIPS (N-[p-isothiocyanatophenethyl]spiperone) on dopamine receptors in rat brain were characterized by radioreceptor assays and quantitative autoradiography. NIPS alkylated D2 and D4 receptors concentration-dependently in brain sections and transfected cells. NIPS also alkylated both receptors dose-dependently in vivo, with no effect on dopamine D1-like or serotonin 5-HT2 receptors at a dose that occluded 75% of D2 and D4 receptors. Pretreatment with D2-like receptor selective antagonist haloperidol completely blocked the effects of NIPS. The findings demonstrate that NIPS selectively alkylates D2 and D4 receptors, indicating its potential utility for studies of these receptors.
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