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CHOP induces activating transcription factor 5 (ATF5) to trigger apoptosis in response to perturbations in protein homeostasis

Environmental stresses that disrupt protein homeostasis induce phosphorylation of eIF2, triggering repression of global protein synthesis coincident with preferential translation of ATF4, a transcriptional activator of the integrated stress response (ISR). Depending on the extent of protein disrupti...

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Autores principales: Teske, Brian F., Fusakio, Michael E., Zhou, Donghui, Shan, Jixiu, McClintick, Jeanette N., Kilberg, Michael S., Wek, Ronald C.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The American Society for Cell Biology 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3727939/
https://www.ncbi.nlm.nih.gov/pubmed/23761072
http://dx.doi.org/10.1091/mbc.E13-01-0067
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author Teske, Brian F.
Fusakio, Michael E.
Zhou, Donghui
Shan, Jixiu
McClintick, Jeanette N.
Kilberg, Michael S.
Wek, Ronald C.
author_facet Teske, Brian F.
Fusakio, Michael E.
Zhou, Donghui
Shan, Jixiu
McClintick, Jeanette N.
Kilberg, Michael S.
Wek, Ronald C.
author_sort Teske, Brian F.
collection PubMed
description Environmental stresses that disrupt protein homeostasis induce phosphorylation of eIF2, triggering repression of global protein synthesis coincident with preferential translation of ATF4, a transcriptional activator of the integrated stress response (ISR). Depending on the extent of protein disruption, ATF4 may not be able to restore proteostatic control and instead switches to a terminal outcome that features elevated expression of the transcription factor CHOP (GADD153/DDIT3). The focus of this study is to define the mechanisms by which CHOP directs gene regulatory networks that determine cell fate. We find that in response to proteasome inhibition, CHOP enhances the expression of a collection of genes encoding transcription regulators, including ATF5, which is preferentially translated during eIF2 phosphorylation. Transcriptional expression of ATF5 is directly induced by both CHOP and ATF4. Knockdown of ATF5 increases cell survival in response to proteasome inhibition, supporting the idea that both ATF5 and CHOP have proapoptotic functions. Transcriptome analysis of ATF5-dependent genes reveals targets involved in apoptosis, including NOXA, which is important for inducing cell death during proteasome inhibition. This study suggests that the ISR features a feedforward loop of stress-induced transcriptional regulators, each subject to transcriptional and translational control, which can switch cell fate toward apoptosis.
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spelling pubmed-37279392013-10-16 CHOP induces activating transcription factor 5 (ATF5) to trigger apoptosis in response to perturbations in protein homeostasis Teske, Brian F. Fusakio, Michael E. Zhou, Donghui Shan, Jixiu McClintick, Jeanette N. Kilberg, Michael S. Wek, Ronald C. Mol Biol Cell Articles Environmental stresses that disrupt protein homeostasis induce phosphorylation of eIF2, triggering repression of global protein synthesis coincident with preferential translation of ATF4, a transcriptional activator of the integrated stress response (ISR). Depending on the extent of protein disruption, ATF4 may not be able to restore proteostatic control and instead switches to a terminal outcome that features elevated expression of the transcription factor CHOP (GADD153/DDIT3). The focus of this study is to define the mechanisms by which CHOP directs gene regulatory networks that determine cell fate. We find that in response to proteasome inhibition, CHOP enhances the expression of a collection of genes encoding transcription regulators, including ATF5, which is preferentially translated during eIF2 phosphorylation. Transcriptional expression of ATF5 is directly induced by both CHOP and ATF4. Knockdown of ATF5 increases cell survival in response to proteasome inhibition, supporting the idea that both ATF5 and CHOP have proapoptotic functions. Transcriptome analysis of ATF5-dependent genes reveals targets involved in apoptosis, including NOXA, which is important for inducing cell death during proteasome inhibition. This study suggests that the ISR features a feedforward loop of stress-induced transcriptional regulators, each subject to transcriptional and translational control, which can switch cell fate toward apoptosis. The American Society for Cell Biology 2013-08-01 /pmc/articles/PMC3727939/ /pubmed/23761072 http://dx.doi.org/10.1091/mbc.E13-01-0067 Text en © 2013 Teske et al. This article is distributed by The American Society for Cell Biology under license from the author(s). Two months after publication it is available to the public under an Attribution–Noncommercial–Share Alike 3.0 Unported Creative Commons License (http://creativecommons.org/licenses/by-nc-sa/3.0). “ASCB®,” “The American Society for Cell Biology®,” and “Molecular Biology of the Cell®” are registered trademarks of The American Society of Cell Biology.
spellingShingle Articles
Teske, Brian F.
Fusakio, Michael E.
Zhou, Donghui
Shan, Jixiu
McClintick, Jeanette N.
Kilberg, Michael S.
Wek, Ronald C.
CHOP induces activating transcription factor 5 (ATF5) to trigger apoptosis in response to perturbations in protein homeostasis
title CHOP induces activating transcription factor 5 (ATF5) to trigger apoptosis in response to perturbations in protein homeostasis
title_full CHOP induces activating transcription factor 5 (ATF5) to trigger apoptosis in response to perturbations in protein homeostasis
title_fullStr CHOP induces activating transcription factor 5 (ATF5) to trigger apoptosis in response to perturbations in protein homeostasis
title_full_unstemmed CHOP induces activating transcription factor 5 (ATF5) to trigger apoptosis in response to perturbations in protein homeostasis
title_short CHOP induces activating transcription factor 5 (ATF5) to trigger apoptosis in response to perturbations in protein homeostasis
title_sort chop induces activating transcription factor 5 (atf5) to trigger apoptosis in response to perturbations in protein homeostasis
topic Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3727939/
https://www.ncbi.nlm.nih.gov/pubmed/23761072
http://dx.doi.org/10.1091/mbc.E13-01-0067
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