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Oncogenic BRAF Regulates Oxidative Metabolism via PGC1α and MITF.

机译:致癌BRAF通过PGC1α和MITF调节氧化代谢。

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Activating mutations in BRAF are the most common genetic alterations in melanoma. Inhibition of BRAF by?small molecules leads to cell-cycle arrest and apoptosis. We show here that BRAF inhibition also induces an oxidative phosphorylation gene program, mitochondrial biogenesis, and the increased expression of the?mitochondrial master regulator, PGC1α. We further show that a target of BRAF, the melanocyte lineage factor MITF, directly regulates the expression of PGC1α. Melanomas with activation of the BRAF/MAPK?pathway have suppressed levels of MITF and PGC1α and decreased oxidative metabolism. Conversely, treatment of BRAF-mutated melanomas with BRAF inhibitors renders them addicted to oxidative phosphorylation. Our data thus identify an adaptive metabolic program that limits the efficacy of BRAF inhibitors.
机译:BRAF中的激活突变是黑色素瘤中最常见的遗传变异。小分子对BRAF的抑制导致细胞周期停滞和凋亡。我们在这里显示,BRAF抑制也诱导了氧化磷酸化基因程序,线粒体的生物发生,以及线粒体主调节器PGC1α的表达增加。我们进一步表明,BRAF的目标是黑色素细胞谱系因子MITF,直接调节PGC1α的表达。黑色素瘤与BRAF / MAPK?途径的激活一起抑制了MITF和PGC1α的水平,并降低了氧化代谢。相反,用BRAF抑制剂治疗BRAF突变的黑色素瘤会使他们沉迷于氧化磷酸化。因此,我们的数据确定了限制BRAF抑制剂功效的适应性代谢程序。

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