Mitochondrial MDM2 regulates respiratory complex i activity independently of p53

Journal article


Arena, Giuseppe, Cissé, Madi Yann, Pyrdziak, Samuel, Chatre, Laurent, Riscal, Romain, Fuentes, Maryse, Arnold, Jamie Jon, Kastner, Markus, Gayte, Laurie, Bertrand-Gaday, Christelle, Nay, Kevin, Angebault-Prouteau, Claire, Murray, Kerren, Chabi, Beatrice, Koechlin-Ramonatxo, Christelle, Orsetti, Béatrice, Vincent, Charles, Casas, François, Marine, Jean-Christophe, ... Le Cam, Laurent. (2018) Mitochondrial MDM2 regulates respiratory complex i activity independently of p53. Molecular Cell. 69(4), pp. 594 - 609. https://doi.org/10.1016/j.molcel.2018.01.023
AuthorsArena, Giuseppe, Cissé, Madi Yann, Pyrdziak, Samuel, Chatre, Laurent, Riscal, Romain, Fuentes, Maryse, Arnold, Jamie Jon, Kastner, Markus, Gayte, Laurie, Bertrand-Gaday, Christelle, Nay, Kevin, Angebault-Prouteau, Claire, Murray, Kerren, Chabi, Beatrice, Koechlin-Ramonatxo, Christelle, Orsetti, Béatrice, Vincent, Charles, Casas, François, Marine, Jean-Christophe, Etienne-Manneville, Sandrine, Bernex, Florence, Lombès, Anne, Cameron, Craig Eugene, Dubouchaud, Hervé, Ricchetti, Miria, Linares, Laetitia Karine and Le Cam, Laurent
Abstract

Accumulating evidence indicates that the MDM2 oncoprotein promotes tumorigenesis beyond its canonical negative effects on the p53 tumor suppressor, but these p53-independent functions remain poorly understood. Here, we show that a fraction of endogenous MDM2 is actively imported in mitochondria to control respiration and mitochondrial dynamics independently of p53. Mitochondrial MDM2 represses the transcription of NADH-dehydrogenase 6 (MT-ND6) in vitro and in vivo, impinging on respiratory complex I activity and enhancing mitochondrial ROS production. Recruitment of MDM2 to mitochondria increases during oxidative stress and hypoxia. Accordingly, mice lacking MDM2 in skeletal muscles exhibit higher MT-ND6 levels, enhanced complex I activity, and increased muscular endurance in mild hypoxic conditions. Furthermore, increased mitochondrial MDM2 levels enhance the migratory and invasive properties of cancer cells. Collectively, these data uncover a previously unsuspected function of the MDM2 oncoprotein in mitochondria that play critical roles in skeletal muscle physiology and may contribute to tumor progression.

Year2018
JournalMolecular Cell
Journal citation69 (4), pp. 594 - 609
PublisherCell Press
ISSN1097-2765
Digital Object Identifier (DOI)https://doi.org/10.1016/j.molcel.2018.01.023
Scopus EID2-s2.0-85042135530
Page range594 - 609
Research GroupMary MacKillop Institute for Health Research
Publisher's version
File Access Level
Controlled
Place of publicationUnited States of America
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