Journal article
Protein kinase C inhibits caveolae-mediated endocytosis of TRPV5
American journal of physiology. Renal physiology, Vol.294(5), pp.F1212-F1221
05/01/2008
DOI: 10.1152/ajprenal.00007.2008
PMID: 18305097
Abstract
Transient receptor potential vanilloid 5 (TRPV5) constitutes the apical entry pathway for transepithelial Ca2+ reabsorption in kidney. Many hormones alter renal Ca2+ reabsorption at least partly by regulating TRPV5. The mechanism for acute regulation of TRPV5 by phospholipase C-coupled hormones is largely unknown. Here, we found that protein kinase C (PKC) activator 1-oleoyl-acetyl-sn-glycerol (OAG) increased TRPV5 current density and surface abundance in cultured cells. The OAG-mediated increase of TRPV5 was prevented by preincubation with specific PKC inhibitors. Coexpression with a dominant-negative dynamin increased the basal TRPV5 current density and prevented the increase by OAG. Knockdown of caveolin-1 by small interference RNA (siRNA) prevented the increase of TRPV5 by OAG. In contrast, knockdown of clathrin heavy chain had no effects. OAG had no effect on TRPV5 expressed in caveolin-1 null cells derived from caveolin-1 knockout mice. Forced expression of recombinant caveolin-1 restored the regulation of TRPV5 by OAG in caveolin-1 knockout cells. Mutations of serine-299 and/or serine-654 of TRPV5 (consensus residues for phosphorylation by PKC) abolished the regulation by OAG. Parathyroid hormone (PTH) increased TRPV5 current density in cells coexpressing TRPV5 and type 1 PTH receptor. The increase caused by PTH was prevented by PKC inhibitor, mutation of serine-299/serine-654, or by knockdown of caveolin-1. Thus, TRPV5 undergoes constitutive caveolae-mediated endocytosis. Activation of PKC increases cell surface abundance of TRPV5 by inhibiting the endocytosis. This mechanism of regulation by PKC may contribute to the acute stimulation of TRPV5 and renal Ca2+ reabsorption by PTH.
Details
- Title: Subtitle
- Protein kinase C inhibits caveolae-mediated endocytosis of TRPV5
- Creators
- Seung-Kuy Cha - Southwestern Medical CenterTao Wu - The University of Texas Southwestern Medical CenterChou-Long Huang - The University of Texas Southwestern Medical Center
- Resource Type
- Journal article
- Publication Details
- American journal of physiology. Renal physiology, Vol.294(5), pp.F1212-F1221
- Publisher
- Amer Physiological Soc
- DOI
- 10.1152/ajprenal.00007.2008
- PMID
- 18305097
- ISSN
- 1931-857X
- eISSN
- 1522-1466
- Number of pages
- 10
- Grant note
- DK-20543 / NIDDK NIH HHS; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH National Institute of Diabetes & Digestive & Kidney Diseases (NIDDK) P01DK020543 / NATIONAL INSTITUTE OF DIABETES AND DIGESTIVE AND KIDNEY DISEASES; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH National Institute of Diabetes & Digestive & Kidney Diseases (NIDDK)
- Language
- English
- Date published
- 05/01/2008
- Academic Unit
- Nephrology; Internal Medicine
- Record Identifier
- 9984359815002771
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