Adaptation to mitochondrial stress requires CHOP-directed tuning of ISR.
Adaptation to mitochondrial stress requires CHOP-directed tuning of ISR.
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DOI:
10.1126/sciadv.abf0971
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发表时间:
2021-05
期刊:
影响因子:
13.6
通讯作者:
Trifunovic A
中科院分区:
文献类型:
--
作者:
Kaspar S;Oertlin C;Szczepanowska K;Kukat A;Senft K;Lucas C;Brodesser S;Hatzoglou M;Larsson O;Topisirovic I;Trifunovic A
Upon mitochondrial dysfunction, CHOP acts as a rheostat that attenuates prolonged stress and delays the onset of cardiomyopathy. In response to disturbed mitochondrial gene expression and protein synthesis, an adaptive transcriptional response sharing a signature of the integrated stress response (ISR) is activated. We report an intricate interplay between three transcription factors regulating the mitochondrial stress response: CHOP, C/EBPβ, and ATF4. We show that CHOP acts as a rheostat that attenuates prolonged ISR, prevents unfavorable metabolic alterations, and postpones the onset of mitochondrial cardiomyopathy. Upon mitochondrial dysfunction, CHOP interaction with C/EBPβ is needed to adjust ATF4 levels, thus preventing overactivation of the ATF4-regulated transcriptional program. Failure of this interaction switches ISR from an acute to a chronic state, leading to early respiratory chain deficiency, energy crisis, and premature death. Therefore, contrary to its previously proposed role as a transcriptional activator of mitochondrial unfolded protein response, our results highlight a role of CHOP in the fine-tuning of mitochondrial ISR in mammals.
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影响因子:
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作者:
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DOI:
10.1093/bioinformatics/btp101
发表时间:
2009-04-15
期刊:
Bioinformatics (Oxford, England)
影响因子:
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