伊诺斯
细胞生物学
蛋白激酶B
内皮干细胞
血管内皮生长因子
化学
活性氧
血管内皮生长因子A
血管生成
基质凝胶
细胞迁移
脐静脉
整合素
癌症研究
生物
信号转导
细胞
生物化学
体外
血管内皮生长因子受体
一氧化氮合酶
酶
作者
Sophie Michaud,Sylvie Dussault,Jessika Groleau,Paola Haddad,Alain Rivard
标识
DOI:10.1016/j.yjmcc.2006.05.004
摘要
Endothelial dysfunction is one of the earliest pathological effects of cigarette smoking. Vascular endothelial growth factor (VEGF) has been shown to be an important regulator of endothelial healing and growth. Accordingly, we tested the hypothesis that cigarette smoke exposure impairs VEGF actions in endothelial cells. In human umbilical vein endothelial cells (HUVECs), cigarette smoke extracts (CSE) inhibited VEGF-induced tube formation in the matrigel assay. CSE did not affect HUVECs proliferation, but significantly reduced cellular migration in response to VEGF. This impaired migratory activity was associated with a reduced expression of alpha(v)beta(3), alpha(v)beta(5), alpha(5)beta(1) and alpha(2)beta(1) integrins. The Akt/eNOS/NO pathway has been shown to be important for VEGF-induced endothelial cell migration. We found that CSE inhibited Akt/eNOS phosphorylation and NO release in VEGF-stimulated HUVECs. This was associated with an increased generation of reactive oxygen species (ROS). Importantly, in HUVECs exposed to CSE, treatment with antioxidants (NAC, vitamin C) reduced ROS formation and rescued VEGF-induced NO release, cellular migration and tube formation. Moreover, treatment with NO donors (SNAP, SNP) or a cGMP analog (8-Br-cGMP) rescued integrin expression, cellular migration and tube formation in endothelial cells exposed to CSE. (1) Cigarette smoke exposure impairs VEGF-induced endothelial cell migration and tube formation. (2) The mechanism involves increased generation of ROS, decreased expression of surface integrins together with a blockade of the Akt/eNOS/NO pathway. (3) These findings could contribute to explain the negative effect of cigarette smoking on endothelial function and vessel growth.
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