Microinjection of N-methyl--aspartic acid (NMDA, 300 ng/3 l) into the left lateral ventricle causes a substantial increase in locomotor activity which can be significantly reduced by a chronic pretreatment with the ACTH(4\u969) analogue ORG 2766 (1 g/0.5 ml saline, subcutaneous (s.c.) every day for 7 days, last injection 24 h before the NMDA-injection). A single dose of ORG 2766 (1 ng/1 l) injected into the left central amygdaloid nucleus 30 min before the NMDA-injection was equally effective in reducing the increase in locomotion. Furthermore it counteracted the predominance of contralateral turning induced by the NMDA-injection. The data give support for the idea that ORG 2766 excerts its effects on behavior and neural recovery by modulating NMDA receptor activity in the brain
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