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Abstract #106405 Published in IGR 23-3
Epigallocatechin-3-Gallate Protects Trabecular Meshwork Cells from Endoplasmic Reticulum Stress
Zhou L; He JN; He JN; Du L; Ho BM; Ng DS; Chan PP; Tham CC; Pang CP; Chu WKOxidative medicine and cellular longevity 2022; 2022: 7435754
Primary open-angle glaucoma (POAG) is the most common form of glaucoma, for which elevated intraocular pressure (IOP) is a major risk factor. IOP is mainly regulated by dynamic balance of aqueous humor (AH) production and outflow via the conventional trabecular meshwork/Schlemm's canal (TM/SC) pathway. Dysfunctions of TM cells due to endoplasmic reticulum (ER) stress have been demonstrated to increase the resistance of AH outflow, resulting in IOP elevation. Epigallocatechin-3-gallate (EGCG), the most abundant polyphenolic component in green tea, has been shown to alleviate ER stress in several diseases while its potential roles in alleviating ER stress in TM cells have not been determined. In this study, we investigate the mitigation of tunicamycin-induced ER stress in TM cells by EGCG. MTT assay was used to measure the cell viability of human TM (HTM) cells and primary porcine TM (PTM) cells. ER stress levels in both HTM cells and primary PTM cells were detected by quantitative real-time PCR. The primary PTM cells isolated from porcine TM tissues were characterized by immunostaining. We found that 40 M and 80 M EGCG pretreatment substantially promoted HTM cell survival under 3 M tunicamycin-induced ER stress. Pretreatment of 40 M EGCG markedly reduced the expression of ER stress markers , , and evoked by 3 M tunicamycin in HTM cells. Furthermore, 40 M EGCG pretreatment significantly decreased the expressions of , , and at the mRNA level induced by 3 M tunicamycin and improved cell viability in primary PTM cells. Our results show that EGCG is capable of protecting TM cells from ER stress. EGCG provides a promising therapeutic option for POAG treatment.
Department of Ophthalmology & Visual Sciences, The Chinese University of Hong Kong, Hong Kong.
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