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Immunolocalization of the Four Prostaglandin E₂ Receptor Proteins EP1, EP2, EP3, and EP4 in Human Kidney

Department of Pediatrics, Philipps University, Marburg, Germany.

Correspondence to Dr. Rolf M. Nüsing, Department of Pediatrics, Philipps University, 35033 Marburg, Germany. Phone: +49 6421 284292; Fax: +49 6421 282654; E-mail: nuesing{at}mailer.uni-marburg.de

Abstract

Abstract. Four prostaglandin E₂ receptor subtypes designated EP1, EP2, EP3, and EP4 have been shown to mediate a variety of effects of prostaglandin E₂ (PGE₂) on glomerular hemodynamics, tubular salt and water reabsorption, and on blood vessels in the human kidney. Despite the important role of renal PGE₂, the localization of PGE₂ receptor proteins in the human kidney is unknown. The present study used antipeptide antibodies to the EP1 to EP4 receptor proteins for immunolocalization in human kidney tissue. Immunoblot studies using these antibodies demonstrated distinct bands in membrane fraction from human kidney. By means of immunohistochemistry, expression of the human EP1 receptor subtype protein in renal tissue was detected mainly in connecting segments, cortical and medullary collecting ducts, and in the media of arteries and afferent and efferent arterioles. The human EP2 receptor subtype protein was detectable only in the media of arteries and arterioles. The human EP3 receptor subtype protein was strongly expressed in glomeruli, Tamm-Horsfall negative late distal convoluted tubules, connecting segments, cortical and medullary collecting ducts, as well as in the media and the endothelial cells of arteries and arterioles. Staining of the human EP4 receptor subtype protein was observed in glomeruli and in the media of arteries. However, no signal of either receptor subtype was detected in the thick ascending limb, the macula densa, or in adjacent juxtaglomerular cells. These results support the concept that PGE₂ modulates specific functions in different anatomical structures of the human kidney.

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