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Role of the unfolded protein response in cell death

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Abstract

Unfolded protein response (UPR) is an important genomic response to endoplasmic reticulum (ER) stress. The ER chaperones, GRP78 and Gadd153, play critical roles in cell survival or cell death as part of the UPR, which is regulated by three signaling pathways: PERK/ATF4, IRE1/XBP1 and ATF6. During the UPR, accumulated unfolded protein is either correctly refolded, or unsuccessfully refolded and degraded by the ubiquitin-proteasome pathway. When the unfolded protein exceeds a threshold, damaged cells are committed to cell death, which is mediated by ATF4 and ATF6, as well as activation of the JNK/AP-1/Gadd153-signaling pathway. Gadd153 suppresses activation of Bcl-2 and NF-κB. UPR-mediated cell survival or cell death is regulated by the balance of GRP78 and Gadd153 expression, which is coregulated by NF-κB in accordance with the magnitude of ER stress. Less susceptibility to cell death upon activation of the UPR may contribute to tumor progression and drug resistance of solid tumors.

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Abbreviations

UPR:

unfolded protein response

ER:

endoplasmic reticulum

GRP:

glucose-regulated protein

BiP:

immunoglobulin binding protein

Gadd153:

growth arrest and DNA damage-inducible protein 153

PERK:

double-stranded RNA-activated protein kinase-like ER kinase

ATF:

activating transcription factor

IRE-1:

high inositol-requiring 1

XBP1:

X-box binding protein 1

JNK:

c-Jun N-terminal kinase

ASK1:

apoptosis signal-regulating kinase

CHOP/Gadd153:

CCAAT/enhancer-binding protein (C/EBP)-homologous protein/growth arrest and DNA damage-inducible protein 153

eIF:

eukaryotic initiation factor

ERAD:

ER-associated degradation

EDEM:

ER degradation-enhancing α-mannosidase-like protein

TRF2:

TNF receptor-associated factor 2

bZIP:

basic leucine zipper

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Kim, R., Emi, M., Tanabe, K. et al. Role of the unfolded protein response in cell death. Apoptosis 11, 5–13 (2006). https://doi.org/10.1007/s10495-005-3088-0

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