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Table of Contents
Vol. 15, No. 1-4, 2005
Issue release date: January 2005
Section title: Original Paper
Cell Physiol Biochem 2005;15:175–182

Requirement of PDZ Domains for the Stimulation of the Epithelial Ca2+ Channel TRPV5 by the NHE Regulating Factor NHERF2 and the Serum and Glucocorticoid Inducible Kinase SGK1

Palmada M.1 · Poppendieck S.1 · Embark H.M.1 · van de Graaf S.F.J.2 · Boehmer C.1 · Bindels R.J.M.2 · Lang F.1
1Dept. of Physiology I, University of Tübingen, 2Physiology, Radboud University Nijmegen Medical Center
email Corresponding Author

Prof. Dr. Florian Lang

Physiologisches Institut der Universität Tübingen

Gmelinstr. 5, D-72076 Tübingen (Germany)

Tel. +49 7071 29 72194, Fax: +49 7071 29 5618

E-Mail florian.lang@uni-tuebingen.de

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Renal calcium reabsorption involves the epithelial calcium channel ECaC1 (TRPV5) which is tightly regulated by 1,25(OH)2D3. As shown recently, TRPV5 is activated by the serum and glucocorticoid inducible kinase SGK1, a kinase transcriptionally upregulated by 1,25(OH)2D3. This stimulatory effect is due to enhanced TRPV5 abundance in the plasma membrane and requires the presence of the scaffold protein NHERF2 (sodium hydrogen exchanger regulating factor 2). The present study aims to define the molecular requirements for the interaction of TRPV5 with SGK1 and NHERF2. Pull-down experiments and overlay assays revealed that the TRPV5 C-tail interacts in a Ca2+-independent manner with NHERF2. Deletion of the second but not of the first PDZ domain in NHERF2 abrogates the stimulating effect of SGK1/NHERF2 on TRPV5 protein abundance in the plasma membrane as quantified by chemiluminescence and electrophysiology. Thus, the second PDZ domain in NHERF2 is required for stabilization at or TRPV5 targeting to the plasma membrane. The experiments demonstrate the significance of SGK1 and NHERF2 as TRPV5 modulators which are likely to participate in the regulation of calcium homeostasis by 1,25(OH)2D3.

© 2005 S. Karger AG, Basel

Article / Publication Details

First-Page Preview
Abstract of Original Paper

Accepted: July 10, 2004
Published online: January 13, 2005
Issue release date: January 2005

Number of Print Pages: 8
Number of Figures: 0
Number of Tables: 0

ISSN: 1015-8987 (Print)
eISSN: 1421-9778 (Online)

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