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Release of somatostatin from slices of rat frontal cortex was studied. Increasing the potassium ion concentration in the medium from 6 mM to 55 mM resulted in a significantly increased release of somatostatin. Dopamine increased the release of somatostatin from cortex and this effect of dopamine was blocked by haloperidol and other dopaminergic antagonists. Other catecholamines as well as serotonin, histamine and acetylcholine failed to stimulate the release of somatostatin. The stimulatory effect of dopamine on release of somatostatin from cortical slices provides an approach for examination of the receptor properties and function of dopamine in this brain region.
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