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Originally published In Press as doi:10.1074/jbc.M009422200 on January 9, 2001

J. Biol. Chem., Vol. 276, Issue 15, 11830-11837, April 13, 2001
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Sphingosine 1-Phosphate-induced Endothelial Cell Migration Requires the Expression of EDG-1 and EDG-3 Receptors and Rho-dependent Activation of alpha vbeta 3- and beta 1-containing Integrins*

Ji H. Paik, Sung-suk Chae, Menq-Jer Lee, Shobha Thangada, and Timothy HlaDagger

From the Center for Vascular Biology, Department of Physiology, University of Connecticut Health Center, Farmington, Connecticut 06030-3501

Sphingosine 1-phosphate (SPP), a platelet-derived bioactive lysophospholipid, is a regulator of angiogenesis. However, molecular mechanisms involved in SPP-induced angiogenic responses are not fully defined. Here we report the molecular mechanisms involved in SPP-induced human umbilical vein endothelial cell (HUVEC) adhesion and migration. SPP-induced HUVEC migration is potently inhibited by antisense phosphothioate oligonucleotides against EDG-1 as well as EDG-3 receptors. In addition, C3 exotoxin blocked SPP-induced cell attachment, spreading and migration on fibronectin-, vitronectin- and Matrigel-coated surfaces, suggesting that endothelial differentiation gene receptor signaling via the Rho pathway is critical for SPP-induced cell migration. Indeed, SPP induced Rho activation in an adherence-independent manner, whereas Rac activation was dispensible for cell attachment and focal contact formation. Interestingly, both EDG-1 and -3 receptors were required for Rho activation. Since integrins are critical for cell adhesion, migration, and angiogenesis, we examined the effects of blocking antibodies against alpha vbeta 3, beta 1, or beta 3 integrins. SPP induced Rho-dependent integrin clustering into focal contact sites, which was essential for cell adhesion, spreading and migration. Blockage of alpha vbeta 3- or beta 1-containing integrins inhibited SPP-induced HUVEC migration. Together our results suggest that endothelial differentiation gene receptor-mediated Rho signaling is required for the activation of integrin alpha vbeta 3 as well as beta 1-containing integrins, leading to the formation of initial focal contacts and endothelial cell migration.


* This work was supported by National Institutes of Health Grant DK-45659 (to T. H.), an Established Investigator Grant of the American Heart Association (to T. H.), and a Scientist Development Grant of the Northeast Affiliate of the American Heart Association (to M. J. L.).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 To whom correspondence should be addressed: Center for Vascular Biology, Dept. of Physiology, University of Connecticut Health Center, 263 Farmington Ave., Farmington, CT 06030-3501. Tel.: 860-679-4128; Fax: 860-679-1201; E-mail: hla@sun.uchc.edu.


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