Insulin Increases D5 Dopamine Receptor Expression and Function in Renal Proximal Tubule Cells from Wistar-Kyoto Rats

Overview

Journal Am J Hypertens

Publisher Oxford University Press

Specialty Cardiology & Vascular Diseases

Date 2009 Apr 18

PMID 19373217

Citations 12

Authors

Jian Yang

Zhigang Cui

Duofen He

Hongmei Ren

Yu Han

Changqing Yu

Chunjiang Fu

Zheng Wang

Chengming Yang

Xukai Wang

Lin Zhou

Laureano D Asico

Van Anthony M Villar

Ulrich Hopfer

Mantian Mi

Chunyu Zeng

Pedro A Jose

Affiliations

Soon will be listed here.

Abstract

Background: Ion transport in the renal proximal tubule (RPT) is regulated by numerous hormones and humoral factors, including insulin and dopamine. Previous studies show an interaction between insulin and the D(1) receptor. Because both D(1) and D(5) receptors belong to the D(1)-like receptor subfamily, it is possible that an interaction between insulin and the D(5) dopamine receptor exists in RPT cells from normotensive Wistar-Kyoto (WKY) rats and spontaneously hypertensive rats (SHRs).

Methods: D(5) receptor expression in immortalized RPT cells from WKY and SHRs was quantified by immunoblotting and D(5) receptor function by measuring Na(+)-K(+) ATPase activity.

Results: Insulin increased the expression of the D(5) receptor. Stimulation with insulin (10(-7) mol/l) for 24 h increased D(5) receptor expression in RPT cells from WKY rats. This effect of insulin on D(5) receptor expression was aberrant in RPT cells from SHRs. The stimulatory effect of insulin on D(5) receptor expression in RPT cells from WKY rats was inhibited by a protein kinase C (PKC) inhibitor (PKC inhibitor peptide 19-31, 10(-6) mol/l) or a phosphatidylinositol 3 (PI3) kinase inhibitor (wortmannin, 10(-6) mol/l), indicating that both PKC and PI3 kinase were involved in the signaling pathway. Stimulation of the D(5) receptor heterologously expressed in HEK293 cells with fenoldopam (10(-7) mol/l/15 min) inhibited Na(+)-K(+) ATPase activity, whereas pretreatment with insulin (10(-7) mol/l/24 h) increased the D(5) receptor-mediated inhibition.

Conclusions: Insulin and D(5) receptors interact to regulate renal sodium transport; an aberrant interaction between insulin and D(5) receptor may participate in the pathogenesis of hypertension.

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