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Nuclear TP53: An unraveled function as transcriptional repressor of PINK1.
Autophagy 2018
The tumor suppressor TP53/p53 is a key protein in both neurodegenerative diseases and cancer. Thus, TP53-linked cell death appears exacerbated in several age-related neuropathologies, while TP53 mutation-associated phenotypes indicate a loss of function accounting for approximately half of cancers. Thus, TP53 plays a pivotal role in these phenotypically distinct pathologies, a hypothesis reinforced by recent epidemiological studies suggesting an opposite risk to develop one type of pathology relative to the other. Dysfunctions in mitophagic processes also occur in both types of pathologies and again, TP53 has been proposed as one of the regulators of this cellular process. The consensus view postulates that TP53 exerts both anti- and pro-autophagy functions that are directly driven by a specific subcellular localization. Thus, TP53 positively modulates autophagy via the transcriptional control of several genes while it is acknowledged that its anti-autophagy phenotype is exclusively linked to a transcription-independent cytosolic control of an AMPK-MTOR cascade. Our study indicates that TP53 can also downregulate the specialized autophagy-related mitophagy response via the transcriptional repression of PINK1. This is the first demonstration of an anti-mitophagic control by nuclear TP53.
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