Vascular Biology |
From the Department of Pharmacology (M.Y., S.K., H.I.), Osaka City University Medical School, Osaka; the Department of Ophthalmology (M.Y., T.I., O.M.), Hyogo College of Medicine, Hyogo; the Department of Cardiovascular Medicine (K.E.), Graduate School of Medical Science, Kyusyu University, Fukuoka; and the Second Department of Pathology (M.T.), Kumamoto University School of Medicine, Kumamoto, Japan.
Correspondence to Shokei Kim, MD, Department of Pharmacology, Osaka City University Medical School, 1-4-3 Asahimachi, Abeno, Osaka, 545-8585, Japan. E-mail kims{at}med.osaka-cu.ac.jp
Objective We investigated the role of monocyte chemoattractant protein-1 (MCP-1) in vascular endothelial growth factor (VEGF)induced angiogenesis and vascular permeability and the underlying molecular mechanism of VEGF-induced endothelial MCP-1 expression in vitro and in vivo.
Methods and Results We used an antiMCP-1 neutralizing antibody for specific inhibition of MCP-1. VEGF increased tubule formation in the angiogenesis assay and vascular permeability in the Miles assay, and these effects were markedly inhibited by antiMCP-1 antibody. Using a luciferase MCP-1 promoter-gene assay, we found that the activator protein-1 (AP-1) binding site of the MCP-1 promoter region contributes to the increase in MCP-1 promoter activity by VEGF. To specifically inhibit AP-1, we used recombinant adenovirus containing a dominant-negative c-Jun (Ad-DN-c-Jun). Ad-DN-c-Jun inhibited VEGF-induced endothelial MCP-1 mRNA expression and promoter activity in vitro. In vivo gene transfer of DN-c-Jun into rat carotid artery, with the hemagglutinating virus of the Japan liposome method, significantly blocked VEGF-induced MCP-1 and macrophage/monocyte (ED1) expression in endothelium.
Conclusions These results reveal that endothelial MCP-1 induced by VEGF seems to participate in angiogenesis, vascular leakage, or arteriosclerosis. AP-1 plays a critical role in the molecular mechanism underlying induction of MCP-1 by VEGF.
Key Words: angiogenesis vascular permeability gene transfer activator protein-1 dominant-negative mutant
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