Abstract
The presence of dopamine sensitive adenylate cyclase was established in solubilized fractions of bovine retina. Dopamine was a more potent activator of the enzyme than norepinephrine or isoproterenol. The apparent inhibition constants ( K i ) for the dopamine stimulated adenylate cyclase were as follows: haloperidol 0·012 μ m , chlorpromazine 0·038 μ m , pimozide 6·6 μ m , phentolamine 17 μ m and propranolol 175 μ m . The results are compared with the available data of different parts of the brain.
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