Abstract:We studied the effects of substance P on intravenous self-administration of morphine in WAG/G and Fischer-344 rats. By the end of week 2 the daily amount of self-administered morphine in WAG/G rats was higher than in Fischer-344 rats. Treatment with substance P markedly suppressed self-injection of morphine, particularly in low doses. The most pronounced effects were observed in Fischer-344 rats. Substance P did not change food-procuring behavior of animals in the same experimental chambers. Since the content … Show more
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