UMR Inserm 1069 N2COx « Niche, Nutrition, Cancer et métabolisme Oxydatif », Tours University, Tours, France.
CNRS UMR 6015, Inserm U1083 MITOVASC, MitoLab team, Angers University, Angers, France.
PLoS Biol. 2024 Oct 28;22(10):e3002854. doi: 10.1371/journal.pbio.3002854. eCollection 2024 Oct.
The mitochondrial Ca2+ uniporter (MCU) plays crucial role in intramitochondrial Ca2+ uptake, allowing Ca2+-dependent activation of oxidative metabolism. In recent decades, the role of MCU pore-forming proteins has been highlighted in cancer. However, the contribution of MCU-associated regulatory proteins mitochondrial calcium uptake 1 and 2 (MICU1 and MICU2) to pathophysiological conditions has been poorly investigated. Here, we describe the role of MICU2 in cell proliferation and invasion using in vitro and in vivo models of human colorectal cancer (CRC). Transcriptomic analysis demonstrated an increase in MICU2 expression and the MICU2/MICU1 ratio in advanced CRC and CRC-derived metastases. We report that expression of MICU2 is necessary for mitochondrial Ca2+ uptake and quality of the mitochondrial network. Our data reveal the interplay between MICU2 and MICU1 in the metabolic flexibility between anaerobic glycolysis and OXPHOS. Overall, our study sheds light on the potential role of the MICUs in diseases associated with metabolic reprogramming.
线粒体钙单向转运体(MCU)在细胞内钙摄取中起着至关重要的作用,允许钙依赖性激活氧化代谢。在过去的几十年中,MCU 孔形成蛋白的作用在癌症中得到了强调。然而,MCU 相关调节蛋白线粒体钙摄取蛋白 1 和 2(MICU1 和 MICU2)对病理生理条件的贡献尚未得到充分研究。在这里,我们使用人类结直肠癌(CRC)的体外和体内模型描述了 MICU2 在细胞增殖和侵袭中的作用。转录组分析表明,在晚期 CRC 和 CRC 衍生的转移中,MICU2 的表达增加,以及 MICU2/MICU1 比值增加。我们报告说,MICU2 的表达对于线粒体钙摄取和线粒体网络的质量是必要的。我们的数据揭示了 MICU2 和 MICU1 之间在无氧糖酵解和 OXPHOS 之间代谢灵活性的相互作用。总的来说,我们的研究揭示了 MICUs 在与代谢重编程相关的疾病中的潜在作用。