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- W2910241862 abstract "This study aimed to investigate the differential responses of trabecular meshwork stem cells (TMSCs) and trabecular meshwork (TM) cells to endoplasmic reticulum (ER) stress inducers.Human TM cells and TMSCs were exposed to tunicamycin, brefeldin A, or thapsigargin. Cell apoptosis was evaluated by flow cytometry. ER stress markers were detected by quantitative PCR, Western blotting, and immunostaining. Morphologic changes were evaluated by transmission electron microscopy. Cells were treated with the PERK inhibitor GSK2606414 or the elF2α dephosphorylation inhibitor Salubrinal together with tunicamycin to evaluate their effects on ER stress.Both TMSCs and TM cells underwent apoptosis after 48- and 72-hour treatment with ER stress inducers. ER stress triggered the unfolded protein response (UPR) with increased expression of GRP78, sXBP1, and CHOP, which was significantly lower in TMSCs than TM cells. Swollen ER and mitochondria were detected in both TMSCs and TM cells. Neither GSK2606414 nor salubrinal alone activated UPR. GSK2606414 significantly reduced cell survival rates after tunicamycin treatment, and salubrinal increased cell survival rates. The increased expression of GRP78, sXBP1, CHOP, and GADD34 peaked at 6 or 12 hours and lasted longer in TM cells than TMSCs. Salubrinal treatment dramatically increased OCT4 and CHI3L1 expression in TMSCs.In response to ER stress inducers, TMSCs activated a lower level of UPR and lasted shorter than TM cells. Inhibition of elF2α dephosphorylation had a protective mechanism against cell death. Stem cells combined with salubrinal may be a more effective way for TM regeneration in glaucoma." @default.
- W2910241862 created "2019-01-25" @default.
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- W2910241862 date "2019-01-17" @default.
- W2910241862 modified "2023-09-30" @default.
- W2910241862 title "Endoplasmic Reticulum Stress Response of Trabecular Meshwork Stem Cells and Trabecular Meshwork Cells and Protective Effects of Activated PERK Pathway" @default.
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- W2910241862 doi "https://doi.org/10.1167/iovs.18-25477" @default.
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