dizocilpine-maleate and 1-(4-chlorobenzoyl)piperazine-2-3-dicarboxylic-acid

Rats were trained to avoid or escape electric shocks in a symmetrical Y-maze by choosing to enter the brighter of two arms. Pretreatment with phencyclidine-like compounds disrupted brightness discrimination with greatly increased spontaneous locomotor activity between trials. The competitive antagonists of NMDA, 2-amino-7-phosphonoheptanoate (AP7) or 3-(+/-)-2-carboxypiperazin-4-yl)propyl-1-phosphonic acid (CPP) also disrupted brightness discrimination when injected into the cerebral ventricles, with no increase in movements between trials. The results suggest that the competitive antagonists of NMDA may impair sensory and cognitive functions in a manner similar to that produced by the phencyclidine-like compounds.

Topics: 2-Amino-5-phosphonovalerate; Amino Acids; Animals; Anticonvulsants; Aspartic Acid; Dibenzocycloheptenes; Discrimination, Psychological; Dizocilpine Maleate; Light; Male; N-Methylaspartate; Phencyclidine; Piperazines; Rats; Rats, Inbred F344