Is the renal vasodilatation induced by beta-adrenoceptor stimulants in the dog mediated through dopamine receptor?

In chloralose-anaesthetized dogs the renal vasodilator effect of isoprenaline is depressed by blockade of either dopamine or beta-adrenoceptors but the renal vasodilator effect of dopamine is depressed only by blockade of dopamine receptors. This suggests that the vasodilatation induced by beta-stimulants within the canine kidney is due in part to activation of dopamine receptors.