(Hypertension. 1997;29:334.)
© 1997 American Heart Association, Inc.
Arthur C. Corcoran Memorial Lecture |
From the University of Southern California (K.G., X.-P.X., D.Y., W.A.H., R.E.L.), School of Medicine, Department of Medicine, Division of Endocrinology, Diabetes and Hypertension, Los Angeles, and Department of Medicine/Cardiology (E.F.), German Heart Institute Berlin and Virchow Klinikum d. HU Berlin, Germany.
Correspondence to Kristof Graf, MD, LAC & USC Medical Center, 1200 N State St. Room 8250, Los Angeles, CA 90033. E-mail graf{at}hsc.usc.edu
Migration of vascular smooth muscle cells (VSMCs) is a crucial response to vascular injury resulting in neointima formation and atherosclerosis. Platelet-derived growth factor (PDGF-BB) functions as a potent chemoattractant for VSMCs and enhances these pathologies in the vasculature. However, little is known about the intracellular pathways that mediate VSMC migration. In the present study, we investigated the role of mitogen-activated protein kinase (MAPK) activation in this function, since PDGF-BB as well as other growth factors activate this pathway. Using an in-gel kinase assay, we observed that PD 98059, an inhibitor of MEK that activates MAP kinase, inhibited PDGF-BB-induced activation of ERK-1 and ERK-2 in cultured rat aortic smooth muscle cells in a concentration-dependent manner. In contrast, PDGF-mediated activation of intracellular calcium release was not affected by PD 98059. The chemotactic response of both rat aortic smooth muscle cells (RASMCs) and human umbilical vein smooth muscle cells (HUSMCs) toward PDGF-BB (10 ng/mL) was significantly reduced by PD 98059 (10 µmol/L) to 41.7±7.1% in RASMCs (P>.01) and to 47.2 ±5.3% in HUSMCs (P>.01). Similar inhibition was seen at 30 µmol/L, less at 1 µmol/L. To further confirm the specificity of these results implicating the MAPK pathway, an antisense oligodeoxynucleotide (ODN) directed against the initiation translation site of rat ERK-1 and ERK-2 mRNA was used to suppress MAP kinase synthesis and function in rat VSMCs. Liposomal transfection with 0.4 µmol/L antisense ODN reduced ERK-1 and ERK-2 protein by 65% (P>.01) after 48 hours. The chemotactic response to PDGF-BB (10 ng/mL) was reduced by 75% (P>.01) in rat VSMCs transfected with the same antisense ODN concentration. Sense and scrambled control ODNs (0.4 µmol/L) did not affect ERK-1 and ERK-2 protein concentrations or chemotaxis of VSMCs induced by PDGF-BB. These experiments provide the first evidence that activation of MAPK is a critical event in PDGF-mediated signal transduction regulating VSMC migration.
Key Words: smooth muscle cell migration platelet-derived growth factor MAP kinase antisense oligodeoxynucleotide
Abbreviations: FBS = fetal bovine serum HBKM = HEPES-buffered Krebs' medium IGF-1 = insulin-like growth factor MAP = mitogen-activated protein MAPK = mitogen-activated protein kinase MEK = mitogen-activated protein kinase kinase ODN = oligodeoxynucleotide PDGF = platelet-derived growth factor RAF = MEKK, MEK kinase RAS = guanine-nucleotide binding protein VSMC = vascular smooth muscle cell
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