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The effects of apomorphine (0.1-2.5 mg/kg) on release of endogenous dopamine and extracellular levels of 3,4-dihydroxyphenylacetic acid (DOPAC) and homovanillic acid (HVA) in the prefrontal cortex and the striatum were examined in vivo by a microdialysis method. Apomorphine significantly reduced release of dopamine and the extracellular levels of dopamine metabolites, DOPAC and HVA, not only in the striatum, but also in the prefrontal cortex. These findings indicate that dopamine autoreceptors modulate in vivo release of dopamine in the prefrontal cortex.
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