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Circulation Research. 2002;90:325-332
Published online before print January 3, 2002, doi: 10.1161/hh0302.104455
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(Circulation Research. 2002;90:325.)
© 2002 American Heart Association, Inc.


Molecular Medicine

Sphingosine-1-Phosphate, a Platelet-Derived Lysophospholipid Mediator, Negatively Regulates Cellular Rac Activity and Cell Migration in Vascular Smooth Muscle Cells

Yasuji Ryu, Noriko Takuwa, Naotoshi Sugimoto, Sotaro Sakurada, Soichiro Usui, Hiroyuki Okamoto, Osamu Matsui, Yoh Takuwa

From the Departments of Physiology (Y.R., N.T., N.S., S.S., S.U., H.O., Y.T.), Radiology (Y.R., O.M.), and Internal Medicine (S.U.), Kanazawa University, Graduate School of Medicine, Kanazawa, Ishikawa, Japan.

Correspondence to Yoh Takuwa, MD, Department of Physiology, Kanazawa University, Graduate School of Medicine, 13-1 Takara-machi, Kanazawa 920-8640, Japan. E-mail ytakuwa{at}med.kanazawa-u.ac.jp

Previous studies demonstrated that sphingosine-1-phosphate (S1P) induced migration of human umbilical vein endothelial cells (HUVECs) whereas it inhibited that of vascular smooth muscle cells (SMCs). This study explored the molecular mechanisms underlying the contrasting S1P actions on vascular cell motility. In rat and human aortic SMCs, the chemoattractant platelet-derived growth factor B-chain (PDGF) induced rapid 5- to 6-fold increases in the cellular amount of GTP-bound, active form of Rac. S1P did not affect PDGF-stimulated tyrosine phosphorylation of PDGF-ß receptor, but strongly inhibited PDGF-induced Rac activation, with a dose-response relationship similar to that for inhibition of PDGF-elicited chemotaxis. Dihydrosphingosine-1-phosphate, which is a weaker agonist for the S1P receptors, but not an inactive ligand sphingosine, also inhibited PDGF-stimulated chemotaxis and Rac activation although to lesser extents compared with S1P, suggesting that negative regulation by S1P of both chemotaxis and Rac was a receptor-mediated process. In contrast, S1P by itself stimulated Rac activity in HUVECs. Among the five S1P receptor isoforms, SMCs prominently expressed Edg-5 mRNA, whereas HUVECs expressed abundant Edg-1 mRNA but lacked detectable expression of Edg-5 mRNA. Adenovirus-mediated expression of a dominant-negative form of either Rac or Cdc42, but not RhoA, markedly attenuated chemotaxis of SMCs and HUVECs toward PDGF and S1P, respectively. Overexpression of Edg-1 in SMCs and Edg-5 in HUVECs reduced S1P-induced inhibition and stimulation, respectively, of Rac activity and migration. These results together indicate that Edg isoform-specific, negative or positive regulation of cellular Rac activity is critically involved in S1P-mediated bimodal regulation of cell motility in SMCs and HUVECs.


Key Words: sphingosine-1-phosphate • chemotaxis • Rac • platelet-derived growth factor • vascular smooth muscle




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