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Original Paper

Involvement of XBP1s in Blue Light-Induced A2E-Containing Retinal Pigment Epithelium Cell Death

Lu B.a · Zhang P.a · Zhou M.a, b · Wang W.a, b · Gu Q.b · Feng J.a · Luo X.b · Sun X.c · Wang F.a, b · Sun X.a, b

Author affiliations

aDepartment of Ophthalmology, Shanghai First People's Hospital, Shanghai Jiao Tong University School of Medicine, and bShanghai Key Laboratory of Fundus Disease and Eye Research Institute and cSchool of Biology and Agriculture, Shanghai Jiao Tong University, Shanghai, China

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Ophthalmic Res 2017;57:252-262

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: March 29, 2016
Accepted: September 30, 2016
Published online: January 19, 2017
Issue release date: April 2017

Number of Print Pages: 11
Number of Figures: 7
Number of Tables: 0

ISSN: 0030-3747 (Print)
eISSN: 1423-0259 (Online)

For additional information: https://www.karger.com/ORE

Abstract

Purpose: Retinal pigment epithelium (RPE) cell dysfunction is essential to the development of retinal degenerative disease. This study was designed to investigate how spliced X-box-binding protein 1 (XBP1s) regulates different modes of RPE cell death in vitro. Methods: Human ARPE19 cells were incubated with 25 μM N-retinylidene-N-retinylethanolamine (A2E) and irradiated with blue light. Expressions of glucose-regulated protein 78 (GRP78) and XBP1s were detected by real-time quantitative PCR and Western blot. STF-083010 was used to suppress XBP1s expression. ARPE19 cell apoptosis was assessed by terminal deoxynucleotidyl transferase dUTP nick end labeling and flow cytometry. Receptor-interacting protein kinase-3 (RIP3) was detected by Western blot. Changes in the morphology of ARPE19 cells were identified by transmission electron microscopy. Results: Blue light-induced A2E-containing ARPE19 cell damage caused a transient elevation of GRP78 and XBP1s, while RIP3 rose in the late stage. STF-083010 effectively inhibited XBP1s expression and brought about the aggravation of apoptosis together with an alleviation of RIP3 expression. Most of the dying cells exhibited apoptotic morphology. Conclusion: A2E, along with blue light, brought about apoptosis and necroptosis of ARPE19 cells, and XBP1s was transiently elevated. The suppression of XBP1s induced ARPE19 cell death by promoting apoptosis rather than necroptosis. XBP1s might play a role in the pathogenesis of retinal degenerative diseases.

© 2017 S. Karger AG, Basel


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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: March 29, 2016
Accepted: September 30, 2016
Published online: January 19, 2017
Issue release date: April 2017

Number of Print Pages: 11
Number of Figures: 7
Number of Tables: 0

ISSN: 0030-3747 (Print)
eISSN: 1423-0259 (Online)

For additional information: https://www.karger.com/ORE


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