Arena 2018 Mol Cell
| Arena G, Cissé MY, Pyrdziak S, Chatre L, Riscal R, Fuentes M, Arnold JJ, Kastner M, Gayte L, Bertrand-Gaday C, Nay K, Angebault-Prouteau C, Murray K, Chabi B, Koechlin-Ramonatxo C, Orsetti B, Vincent C, Casas F, Marine JC, Etienne-Manneville S, Bernex F, Lombès A, Cameron CE, Dubouchaud H, Ricchetti M, Linares LK, Le Cam L (2018) Mitochondrial MDM2 regulates respiratory complex I activity independently of p53. Mol Cell 69:594-609. |
» PMID: 29452639 Open Access; »
Arena G, Cisse MY, Pyrdziak S, Chatre L, Riscal R, Fuentes M, Arnold JJ, Kastner M, Gayte L, Bertrand-Gaday C, Nay K, Angebault-Prouteau C, Murray K, Chabi B, Koechlin-Ramonatxo C, Orsetti B, Vincent C, Casas F, Marine JC, Etienne-Manneville S, Bernex F, Lombes A, Cameron CE, Dubouchaud H, Ricchetti M, Linares LK, Le Cam L (2018) Mol Cell
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. • Keywords: MDM2, MT-ND6, Hypoxia, Migration, Mitochondria, Respiratory complex I • Bioblast editor: Kandolf G • O2k-Network Lab: FR Montpellier Wrutniak-Cabello C
Labels: MiParea: Respiration Pathology: Cancer
Organism: Human Tissue;cell: Lung;gill, Other cell lines Preparation: Permeabilized cells
Coupling state: OXPHOS
Pathway: N, S, NS
HRR: Oxygraph-2k
Labels, 2018-03, O2k-brief
