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Abstract
A dopamine-sensitive adenylate cyclase has been identified in substantia nigra of the rat brain. Low concentrations of dopamine markedly increased the accumulation of cyclic AMP while l-norepinephrine and isoproterenol had little effect at concentrations up to 100 μM. The phenothiazine, trifluoperazine, is a potent inhibitor of the s. nigral adenylate cyclase (I.C. 50 of 0.1 μM), while the adrenergic receptor blocking agents propranolol and phentolamine are ineffective. Basal activity of striatal adenylate cyclase and cAMP phosphodiesterase is approximately 3-fold higher than that found in substantia nigra.
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