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Originally published In Press as doi:10.1074/jbc.M106956200 on August 27, 2001

J. Biol. Chem., Vol. 276, Issue 45, 42401-42408, November 9, 2001
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Stabilization of Cortical Actin Induces Internalization of Transient Receptor Potential 3 (Trp3)-associated Caveolar Ca2+ Signaling Complex and Loss of Ca2+ Influx without Disruption of Trp3-Inositol Trisphosphate Receptor Association*

Timothy LockwichDagger , Brij B. SinghDagger , Xibao Liu, and Indu S. Ambudkar§

From the Secretory Physiology Section, Gene Therapy and Therapeutics Branch, NIDCR, National Institutes of Health Bethesda, Maryland 20892

Ca2+ influx via plasma membrane Trp3 channels is proposed to be regulated by a reversible interaction with inositol trisphosphate receptor (IP3R) in the endoplasmic reticulum. Condensation of the cortical actin layer has been suggested to physically disrupt this interaction and inhibit Trp3-mediated Ca2+ influx. This study examines the effect of cytoskeletal reorganization on the localization and function of Trp3 and key Ca2+ signaling proteins. Calyculin-A treatment resulted in formation of condensed actin layer at the plasma membrane; internalization of Trp3, Galpha q/11, phospholipase Cbeta , and caveolin-1; and attenuation of 1-oleoyl-2-acetyl-sn-glycerol- and ATP-stimulated Sr2+ influx. Importantly, Trp3 and IP3R-3 remained co-localized inside the cell and were co-immunoprecipitated. Jasplakinolide also induced internalization of Trp3 and caveolin-1. Pretreatment of cells with cytochalasin D or staurosporine did not affect Trp3 but prevented calyculin-A-induced effects. Based on these data, we suggest that Trp3 is assembled in a caveolar Ca2+ signaling complex with IP3R, SERCA, Galpha q/11, phospholipase Cbeta , caveolin-1, and ezrin. Furthermore, our data demonstrate that conditions which stabilize cortical actin induce loss of Trp3 activity due to internalization of the Trp3-signaling complex, not disruption of IP3R-Trp3 interaction. This suggests that localization of the Trp3-associated signaling complex, rather than Trp3-IP3R coupling, depends on the status of the actin cytoskeleton.


* The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

Dagger Contributed equally to the results of this work.

§ To whom correspondence should be addressed: Bldg. 10, Rm. 1N-113, National Institutes of Health, Bethesda, MD 20892. Tel.: 301-496-5298; Fax: 301-402-1228; E-mail: indu.ambudkar@nih.gov.


Copyright © 2001 by The American Society for Biochemistry and Molecular Biology, Inc.
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