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(Arteriosclerosis, Thrombosis, and Vascular Biology. 2003;23:224.)
© 2003 American Heart Association, Inc.

Vascular Biology

Lysophosphatidic Acid Induction of Tissue Factor Expression in Aortic Smooth Muscle Cells

Mei-Zhen Cui; Guojun Zhao; Allison L. Winokur; Essam Laag; Jason R. Bydash; Marc S. Penn; Guy M. Chisolm; Xuemin Xu

From the Department of Pathology (M.-Z.C., G.Z., E.L., X.X.), University of Tennessee, Knoxville, and the Department of Cell Biology (A.L.W., J.R.B., M.S.P., G.M.C.), Cleveland Clinic Foundation, Cleveland, Ohio.

Correspondence to Mei-Zhen Cui, PhD, Department of Pathology, University of Tennessee, 2407 River Dr, Knoxville, TN 37996. E-mail cuim{at}utk.edu

Objective— Tissue factor (TF), the initiator of the coagulation cascade, is expressed by cells in atherosclerotic lesions. Lysophosphatidic acid (LPA) is a component of oxidized lipoproteins and an agent released by activated platelets. The present study investigated whether and how TF expression is regulated by LPA.

Methods and Results— Northern blotting, Western blotting, and TF activity assays demonstrated that LPA markedly induced TF mRNA, protein, and activity in vascular smooth muscle cells. LPA-induced TF expression is primarily controlled at the transcriptional level. Phosphorylation of mitogen-activated protein kinase kinase (MEK) and extracellular signaling–regulated kinases (ERK1/2) was rapidly and markedly induced by LPA. MEK inhibitors U0126 and PD98059 blocked both ERK activation and the increase in TF mRNA. In contrast, the specific p38 MAP kinase inhibitor SB203580 had no effect on LPA-induced TF mRNA increase. The Gi protein inhibitor, pertussis toxin, abolished LPA-induced phosphorylation of MEKs and ERKs, as well as the induction of TF mRNA.

Conclusions— Our data demonstrate that a Gi protein and activation of MEKs and ERKs mediate LPA-induced TF expression. Our data suggest that elevated LPA could be a thrombogenic risk factor by upregulating TF expression. These results may have important implications in vascular remodeling and vascular diseases.

Key Words: atherosclerosis • arterial thrombosis • lipid/lipoprotein metabolism • gene expression

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