Induction of vascular endothelial growth factor in balloon-injured baboon arteries. A novel role for reactive oxygen species in atherosclerosis - PubMed (original) (raw)
Comparative Study
Induction of vascular endothelial growth factor in balloon-injured baboon arteries. A novel role for reactive oxygen species in atherosclerosis
J Ruef et al. Circ Res. 1997 Jul.
Abstract
Neovascularization is a hallmark of neointimal formation in atherosclerotic plaques and restenotic lesions. Vascular endothelial growth factor (VEGF) promotes neovascular growth, whereas oxidative stress is a potent factor in vascular cell proliferation. To investigate the mechanisms of neovascular formation, we treated human and rat vascular smooth muscle cells (VSMCs) with H2O2. Northern blot analysis demonstrated a dose- and time-dependent increase in VEGF mRNA, with a maximum of 4-fold at 3 hours (200 mumol/L). As determined by immunoblotting and enzyme-linked immunosorbent assay, VEGF protein expression and secretion were similarly increased. Human umbilical vein endothelial cells were treated with conditioned medium from VSMCs incubated with 200 mumol/L H2O2. DNA synthesis, measured by thymidine incorporation, was increased 4-fold compared with control, an effect that was blocked by a neutralizing anti-VEGF antibody. The lipid peroxidation product 4-hydroxynonenal (1 mumol/L), an endogenous reactive oxygen species present in human atherosclerotic lesions, also increased VEGF secretion in VSMCs in a similar time-dependent fashion. Immunohistochemical staining and in situ hybridization of aortic sections from balloon-injured baboons demonstrated increased VEGF expression in discrete areas of the neointima and media compared with control sections, and expression correlated with the generation of 4-hydroxynonenal. Regulators of VEGF expression, such as reactive oxygen species, may enhance neovascularization of atherosclerotic and restenotic arteries.
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