Dopamine-sensitive adenylate cyclase in canine renal artery

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Abstract
To characterize further a putative dopamine receptor in the renal artery, the effects of dopamine on canine renal artery adenylate cyclase activity were studied. Since the femoral artery is thought to be devoid of a similar dopamine receptor, the effects of dopamine on the adenylate cyclase activity of the canine femoral artery were also studied. In tissues from dogs with or without phenoxybenzamine pretreatment, renal artery adenylate cyclase was maximally stimulated by 4 μm dopamine, compared to 20 μm required for the femoral artery enzyme. The concentrations of isoprenaline required to maximally stimulate renal and femoral artery adenylate cyclase were 0·04 and 0·2 μm, respectively. In tissue from the phenoxybenzamine-pretreated dog, the stimulatory effect of dopamine on the renal artery enzyme was selectively blocked by 0·01 μm haloperidol, but not by 0·2 μm propranolol. In the femoral artery, however, the dopamine stimulation was blocked by both antagonists. Stimulation by isoprenaline of renal and femoral artery adenylate cyclase was blocked by propranolol. These data suggest the concept that dopamine interacts with a specific artery receptor apparently different from α- and β-adrenoceptors.

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