ER Stress Sensitizes Cells to TRAIL Through Down-regulation of FLIP and Mcl-1 and PERK-dependent Up-regulation of TRAIL-R2

Overview

Journal Apoptosis

Publisher Springer

Date 2011 Nov 11

PMID 22072062

Citations 38

Authors

Rosa Martin-Perez

Maho Niwa

Abelardo Lopez-Rivas

Affiliations

Soon will be listed here.

Abstract

Despite recent evidences suggesting that agents inducing endoplasmic reticulum (ER) stress could be exploited as potential antitumor drugs in combination with tumor necrosis factor-related apoptosis-inducing ligand (TRAIL), the mechanisms of this anticancer action are not fully understood. Moreover, the effects of ER stress and TRAIL in nontransformed cells remain to be investigated. In this study we report that ER stress-inducing agents sensitizes both transformed and nontransformed cells to TRAIL-induced apoptosis. In addition, glucose-regulated protein of 78 kDa (GRP78) knockdown by RNA interference induces ER stress and facilitates apoptosis by TRAIL. We demonstrate that TRAIL death-inducing signaling complex (DISC) formation and early signaling are enhanced in ER stressed cells. ER stress alters the cellular levels of different apoptosis-related proteins including a decline in the levels of FLIP and Mcl-1 and the up-regulation of TRAIL-R2. Up-regulation of TRAIL-R2 following ER stress is dependent on the expression of PKR-like ER kinase (PERK) and independent of CAAT/enhancer binding protein homologous protein (CHOP) and Ire1α. Silencing of TRAIL-R2 expression by siRNA blocks the ER stress-mediated sensitization to TRAIL-induced apoptosis. Furthermore, simultaneous silencing of cFLIP and Mcl-1 expression by RNA interference results in a marked sensitization to TRAIL-induced apoptosis. Finally, in FLIP-overexpressing cells ER stress-induced sensitization to TRAIL-activated apoptosis is markedly reduced. In summary, our data reveal a pleiotropic mechanism involving both apoptotic and anti-apoptotic proteins for the sensitizing effect of ER stress on the regulation of TRAIL receptor-mediated apoptosis in both transformed and nontransformed cells.

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