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(Arteriosclerosis, Thrombosis, and Vascular Biology. 2003;23:802.)
© 2003 American Heart Association, Inc.

Vascular Biology

High Density Lipoprotein–Induced Angiogenesis Requires the Activation of Ras/MAP Kinase in Human Coronary Artery Endothelial Cells

Shin-ichiro Miura; Masahiro Fujino; Yoshino Matsuo; Akira Kawamura; Hiroyuki Tanigawa; Hiroaki Nishikawa; Keijiro Saku

From the Department of Cardiology, Fukuoka University School of Medicine, Fukuoka, 814-0180, Japan.

Correspondence to Shin-ichiro Miura, Department of Cardiology, Fukuoka University School of Medicine, 7-45-1 Nanakuma, Jonan-Ku, Fukuoka, 814-0180, Japan. E-mail miuras{at}cis.fukuoka-u.ac.jp

Objective— Plasma high density lipoprotein (HDL) levels have been shown to be inversely correlated with coronary artery disease, but the mechanisms of the direct protective effect of HDL on endothelial cells (ECs) are not fully understood. In this study, we investigated the role of the HDL-mediated promotion of angiogenesis in human coronary artery ECs (HCECs).

Methods and Results— We developed an in vitro model of HCEC tube formation on a matrix gel. We optimized the maximum dose of HDL required to induce tube formation in initial experiments, in which the dose response showed that the maximum effective dose of HDL was 100 µg/mL. PD98059, an inhibitor of p42/44 mitogen-activated protein kinase (MAPK) activity, but not SB203580, an inhibitor of p38 MAPK activity, suppressed HDL-induced tube formation. Dominant-negative Ras N17 inhibited HDL-induced tube formation. HDL activated Ras according to a ras pull-down assay, and this effect was inhibited by pertussis toxin. Moreover, HDL activated phospho(p)-p42/44 MAPK, whereas Ras N17 blocked HDL-induced pp42/44 MAPK.

Conclusions— These results indicate that HDL induced a potent signal through a Ras/MAPK pathway mediated by a pertussis toxin–sensitive G-protein coupled receptor to the angiogenic phenotype in HCECs.

Key Words: high density lipoprotein • Ras • mitogen-activated protein kinase • human coronary artery endothelial cells

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