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The nucleus accumbens contains many neuropeptides whose functions are presently unknown. The purpose of this study was to determine the extent to which these neuropeptides act in conjunction with the mesolimbic dopamine system. Microinjections of cholecystokinin, neurotensin, met-enkephalin, somatostatin, bombesin, as well as glutamate and muscimol, were made into the medial nucleus accumbens after systemic injection of apomorphine. Cholecystokinin and neurotensin, in nanogram doses, potentiated apomorphine-induced stereotypy. Met-enkephalin reduced, while somatostatin and bombesin were without effect on, apomorphine-induced stereotypy. In addition, both glutamate and muscimol potentiated this effect. These results suggest that several neuropeptides and amino acids act in the nucleus accumbens to modulate apomorphine-induced stereotyped behaviors.
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F Baldino
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