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Hypherphagia caused by muscimol injection in the nucleus raphe dorsalis of rats: its control by 5‐hydroxytryptamine in the nucleus accumbens

Muscimol injection in the nucleus raphe dorsalis caused intense eating by rats with access to food. A dose‐related reduction of muscimol's effect was found after bilateral injections of 5‐hydroxytryptamine (5‐HT) in the nucleus accumbens (dose range 2.2–8.8 μg in 2 μl) but no effect was observed when an even higher dose (17.6 μg) of 5‐HT was injected in the caudate putamen. Eating by food‐deprived rats was not changed by any dose of 5‐HT injected either into the nucleus accumbens or the caudate putamen. (+)‐Norfenfluramine, 20 μg, injected in the nucleus accumbens also reduced muscimol‐induced eating but had no effect on the food intake of starved rats. The results suggest an important role of 5‐HT in the nucleus accumbens in the control of certain types of hyperphagia in rats.