Vascular endothelial growth factor inhibits mitogen-induced vascular smooth muscle cell proliferation

被引:28
作者
Dorafshar, AH
Angle, N
Bryer-Ash, M
Huang, DS
Farooq, MM
Gelabert, HA
Freischlag, JA
机构
[1] Univ Calif Los Angeles, David Geffen Sch Med, UCLA Gonda Goldschmied Diabet Ctr, Div Vasc Surg, Los Angeles, CA USA
[2] Univ Calif Los Angeles, David Geffen Sch Med, UCLA Gonda Goldschmied Diabet Ctr, Div Endocrinol Diabet & Hypertens, Los Angeles, CA USA
[3] W Los Angeles Vet Affairs Med Ctr, Res Serv, Los Angeles, CA 90073 USA
关键词
vascular endothelial growth factor; human aortic smooth muscle; neointimal hyperplasia;
D O I
10.1016/S0022-4804(03)00254-3
中图分类号
R61 [外科手术学];
学科分类号
摘要
Introduction. Delivery of vascular endothelial growth factor (VEGF) protein or gene transfer has been shown to accelerate re-endothelialization and attenuate neointimal hyperplasia in various arterial injury models, including balloon injury, stent implantation, and vein grafts. In addition to stimulating re-endothelialization, we hypothesize that VEGF has further vascular protective functions to prevent neointimal hyperplasia by directly inhibiting mitogen-induced proliferation of vascular smooth muscle cells (VSMCs) via the mitogen-activated protein kinase pathway. Materials and methods. Human aortic VSMCs were seeded and serum starved for 24 h. The cells were then stimulated with a mitogen, recombinant human platelet derived growth factor at 20 ng/mL together with 0, 10, 20, 30, 40, 50 ng/mL recombinant human VEGF. A proliferation assay was used to quantitate bromodeoxyuridine uptake into newly synthesized DNA. Western immunoassay was used to quantify extracellular signal-regulated kinase (ERK) 2 protein and phosphorylation of retinoblastoma and ERK 1/2 protein. Results. VEGF inhibited bromodeoxyuridine incorporation into mitogen-induced VSMC in a dose-dependent manner, reaching statistical significance at concentrations of 30 (P < 0.05), 40 (P < 0.05), and 50 ng/mL (P < 0.01). Densitometry of western immunoblots revealed an inhibition of phosphorylation of retinoblastoma at VEGF concentrations of 40 and 50 ng/mL and ERK 1/2 phosphorylation at concentrations of 30, 40 and 50 ng/mL. Conclusion. In addition to stimulating re-endothelialization, VEGF appears to have a vascular protective function by directly inhibiting VSMC proliferation. This effect occurs in the absence of endothelial cells and via the mitogen-activated protein kinase pathway. VEGF may serve as an important modulator of mitogen-induced VSMC proliferation after vascular injury. (C) 2003 Elsevier Inc. All rights reserved.
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页码:179 / 186
页数:8
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