EETs and CYP2J2 inhibit TNF-α-induced apoptosis in pulmonary artery endothelial cells and TGF-β1-induced migration in pulmonary artery smooth muscle cells.

Abstract:

:Cytochrome P450 epoxygenase-derived epoxyeicosatrienoic acids (EETs) have multiple biological functions in cardiovascular homeostasis. The antiinflammatory, anti-migratory and pro-proliferative effects of EETs suggest a possible beneficial role for EETs in the apoptosis, proliferation and migration of pulmonary vascular cells. In this study, we investigated the effects of exogenous EETs and cytochrome P450 2J2 (CYP2J2) overexpression on tumor necrosis factor-α (TNF-α)-induced pulmonary artery endothelial cell (PAEC) apoptosis, and transforming growth factor-β1 (TGF-β1)-induced pulmonary artery smooth muscle cell (PASMC) proliferation and migration. PAECs and PASMCs were cultured from porcine pulmonary arteries. Our findings indicated that EETs or CYP2J2 overexpression significantly protected the PAECs from TNF-α-induced apoptosis, as evaluated by cell viability and flow cytometry. Two mechanisms were found to be involved in these important protective effects: firstly, EETs and CYP2J2 overexpression inhibited the decrease in the expression of the antiapoptotic proteins, Bcl-2 and Bcl-xL, as well as the increase in the expression of the pro-apoptotic protein, Bax, mediated by TNF-α; secondly, they activated the phosphoinositide 3-kinase (PI3K)/Akt and extracellular signal-regulated kinase (ERK) signaling pathways. We also found that 11,12-EET and 14,15-EET significantly inhibited TGF-β1-stimulated PASMC migration. However, EETs did not suppress TGF-β1-induced PASMC proliferation in vitro. These data may represent a novel approach to mitigate pulmonary vascular remodeling in diseases, such as pulmonary arterial hypertension.

journal_name

Int J Mol Med

authors

Feng W,Xu X,Zhao G,Li G,Liu T,Zhao J,Dong R,Wang DW,Tu L

doi

10.3892/ijmm.2013.1435

subject

Has Abstract

pub_date

2013-09-01 00:00:00

pages

685-93

issue

3

eissn

1107-3756

issn

1791-244X

journal_volume

32

pub_type

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