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via MAPK and PI3K/Akt Signaling Pathways
1 Institute of Hypertension, Tongji Hospital, Tongji Medical College, Huazhong University of Science & Technology, Wuhan, China
2 Wuhan, China; Institute of Hypertension, Tongji Hospital, Tongji Medical College, Huazhong University of Science & Technology, Wuhan, China
3 Division of Intramural Research, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, United States
4 Research Triangle Park, North Carolina, United States; Division of Intramural Research, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, United States
5 Life Science College of Beijing University, Beijing, China
6 Wuhan, China; Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science & Technology, Wuhan, China
7 Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science & Technology, Wuhan, China
8 Division of Intramural Research, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, United States
* To whom correspondence should be addressed. E-mail: dwwang{at}tjh.tjmu.edu.cn.
Endothelial cells play a vital role in the maintenance of cardiovascular homeostasis. Epoxyeicosatrienoic acids (EETs), cytochrome P450 (CYP) epoxygenase metabolites of arachidonic acid in endothelial cells, possess potent and diverse biological effects within the vasculature. We evaluated the effects of overexpression of CYP epoxygenases on tumor necrosis factor (TNF)-
induced apoptosis in bovine aortic endothelial cells (BAECs). CYP epoxygenase overexpression, which is known to increase EET biosynthesis, significantly increased endothelial cell viability and inhibited TNF- induction of endothelial cell apoptosis as evaluated by morphological analysis of nuclear condensation, DNA laddering and FACS analysis. CYP epoxygenase overexpression also significantly inhibited caspase-3 activity and downregulation of Bcl-2 expression induced by TNF-. The anti-apoptotic effects of CYP epoxygenase overexpression were significantly attenuated by inhibition of the PI3K/Akt and MAPK signaling pathways; however, inhibition of endothelial nitric oxide synthase activity had no effect. Furthermore, CYP epoxygenase overexpression significantly attenuated the extent of TNF- induced ERK1/2 dephosphorylation in a time-dependent manner, and significantly increased PI3K expression and Akt phosphorylation in both the presence and absence of TNF-. Collectively, these results suggest that CYP epoxygenase overexpression and the concomitant increase in EET biosynthesis significantly protects endothelial cells from apoptosis induced by TNF-. This effect is mediated, at least in part, through inhibition of ERK dephosphorylation and activation of PI3K/Akt signaling.
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