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Cardiovascular Research 1996 31(1):2-6; doi:10.1016/S0008-6363(95)00206-5
© 1996 by European Society of Cardiology
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Copyright © 1996, European Society of Cardiology

Renal dopamine receptors: mechanisms of action and developmental aspects

Po-Yin Cheung*,a,b and Keith J. Barringtonb

aDepartment of Pharmacology, Faculty of Medicine, University of Alberta, Edmonton, Alta. T6G 2H7, Canada
bDepartment of Pediatrics, University of Alberta, Edmonton, Alta. T6G 2H7, Canada

* Corresponding author. Tel. (+1-403) 492-3575; Fax (+1-403) 492-4325.

Dopamine is important for renal perfusion, natriuresis, and the control of blood pressure. Modulation of the activities of adenylyl cyclase, phospholipase C and protein kinases is involved in the signal transduction pathway of dopamine. Peripheral dopamine receptors are classified as the DA1 and DA2 subtypes on the basis of synaptic localization and their pharmacological profiles. In the kidney, DA1 receptors are localized in the medial layer of the renal vasculature and along the nephron; DA2 receptors are found in the glomerulus and the nerves surrounding renal blood vessels. While DA1 receptor stimulation results in renal vasodilatation and natriuresis, DA2 receptors may play a synergistic role in the DA1 modulated natriuresis. There is increasing evidence that these effects of dopamine are attenuated in younger than in older animals. Future studies should be directed to identify the ontogenic differences in vascular and tubular dopamine receptors (density and affinity) and their coupling mechanisms, in order to evaluate the role of dopamine which is frequently used in the management of shock in newborns.

KEYWORDS Dopamine; Renal vasculature; Renal tubules; Dopaminergic receptors; Signal transduction; Ontogeny


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