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Oxidative stress affects retinal pigment epithelial cell survival through epidermal growth factor receptor/AKT signaling pathway.

Abstract：

AIM:To investigate the cross-talk between oxidative stress and the epidermal growth factor receptor (EGFR)/AKT signaling pathway in retinal pigment epithelial (RPE) cells. METHODS:Human RPE cell lines (ARPE-19 cell) were treated with different doses of epidermal growth factor (EGF) and hydrogen peroxide (H2O2). Cell viability was determined by a methyl thiazolyl tetrazolium assay. Cell proliferation was examined by a bromodeoxyuridine (BrdU) incorporation assay. EGFR/AKT signaling was detected by Western blot. EGFR localization was also detected by immunofluorescence. In addition, EGFR/AKT signaling was intervened upon by EGFR inhibitor (erlotinib), PI3K inhibitor (A66) and AKT inhibitor (MK-2206), respectively. H2O2-induced oxidative stress was blocked by antioxidant N-acetylcysteine (NAC). RESULTS:EGF treatment increased ARPE-19 cell viability and proliferation through inducing phosphorylation of EGFR and AKT. H2O2 inhibited ARPE-19 cell viability and proliferation and also suppressed EGF-stimulated increase of RPE cell viability and proliferation by affecting the EGFR/AKT signaling pathway. EGFR inhibitor erlotinib blocked EGF-induced phosphorylation of EGFR and AKT, while A66 and MK-2206 only blocked EGF-induced phosphorylation of AKT. EGF-induced phosphorylation and endocytosis of EGFR were also affected by H2O2 treatment. In addition, antioxidant NAC attenuated H2O2-induced inhibition of ARPE-19 cell viability through alleviating reduction of EGFR, and phosphorylated and total AKT proteins. CONCLUSION:Oxidative stress affects RPE cell viability and proliferation through interfering with the EGFR/AKT signaling pathway. The EGFR/AKT signaling pathway may be an important target in oxidative stress-induced RPE cell dysfunction.

journal_name

Int J Ophthalmol

journal_title

International journal of ophthalmology

authors

Chen XD,Su MY,Chen TT,Hong HY,Han AD,Li WS

doi

10.18240/ijo.2017.04.02

subject

Has Abstract

pub_date

2017-04-18 00:00:00

pages

507-514

issue

eissn

2222-3959

issn

2227-4898

pii

ijo-10-04-507

journal_volume

pub_type

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Oxidative stress affects retinal pigment epithelial cell survival through epidermal growth factor receptor/AKT signaling pathway.