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Journal of Histochemistry and Cytochemistry, Vol. 50, 1091-1096, August 2002, Copyright © 2002, The Histochemical Society, Inc.

ARTICLE

Dopamine D4 Receptor Expression in Rat Kidney: Evidence for Pre- and Postjunctional Localization

Alberto Riccia, Sophie Marchal–Victorionb, Elena Bronzettia, Angelo Parinib, Francesco Amentac, and Seyed K. Tayebatic
a Dipartimento di Scienze Cardiovascolari e Respiratorie, Università "La Sapienza," Roma, Italy
b INSERM U388, Institut Fédératif de Recherche "Louis Bugnard," CHU Rangueil, Toulouse, France
c Sezione di Anatomia Umana, Dipartimento di Scienze Farmacologiche e Medicina Sperimentale, Università di Camerino, Camerino, Italy

Correspondence to: Angelo Parini, INSERM U388, Pharmacologie Moléculaire et Physiopathologie Rénale, Institut Louis Bugnard, Bat. L3, CHU Rangeuil, 31403 Toulouse Cedex 4, France. E-mail: parini@toulouse.inserm.fr

Dopamine D4 receptors mediate inhibition of vasopressin-dependent sodium reabsorption by dopamine in collecting tubules. At present, the distribution of D4 receptors in other renal districts remains an open issue. The renal distribution of D4 receptor was assessed in normally innervated and denervated male Sprague–Dawley rats by quantitative immunohistochemistry using an anti-dopamine D4 receptor rabbit polyclonal antibody. D4 receptor protein immunoreactivity was observed perivascularly in the adventitia and the adventitia–media border. The density of perivascular dopamine D4 receptor was higher in afferent and efferent arterioles than in other segments of the renal vascular tree. Renal denervation abolished perivascular dopamine D4 receptor protein immunoreactivity. In renal tubules, the epithelium of collecting tubules showed the highest dopamine D4 receptor protein immunoreactivity, followed by the epithelium of proximal and distal tubules. No dopamine D4 receptor protein immunoreactivity was observed in the epithelium of the loop of Henle. Denervation did not change dopamine D4 receptor protein immunoreactivity in renal tubules. These results indicate that rat kidney expresses dopamine D4 receptors located both prejunctionally and nonprejunctionally in collecting, proximal, and distal tubules. This suggests that the dopamine D4 receptor may be involved in the control of neurotransmitter release and in renal hemodynamic and tubule function.

(J Histochem Cytochem 50:1091–1096, 2002)

Key Words: D4 receptors, kidney, rat, immunohistochemistry


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