FBXW7 regulates a mitochondrial transcription program by modulating MITF.

FBXW7 regulates a mitochondrial transcription program by modulating MITF.
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FBXW7通过调节MITF调节线粒体转录程序。

DOI:
10.1111/pcmr.12704
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发表时间:
2018-09
影响因子:
4.3
通讯作者:
Celebi JT
Celebi JT
中科院分区:
医学3区
文献类型:
--
作者:
Abbate F;Badal B;Mendelson K;Aydin IT;Serasinghe MN;Iqbal R;Mohammed JN;Solovyov A;Greenbaum BD;Chipuk JE;Celebi JT

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FBXW 7在包括黑色素瘤在内的许多人类癌症中被充分表征为肿瘤抑制因子;然而,肿瘤抑制功能的机制尚未完全阐明。我们利用了两个不同的RNA测序数据集:具有对照与沉默的FBXW 7的人黑素瘤细胞系(n=10)和一组人黑素瘤肿瘤样品(n=51),以定义由FBXW 7调节的转录组指纹。在这里,我们报告说,FBXW 7的损失增强了线粒体基因转录程序,这是依赖于MITF在人类黑色素瘤,并赋予穷人的病人的结果。MITF是黑素细胞的谱系特异性主调节因子,与PGC-1 α一起是依赖线粒体氧化代谢的黑色素瘤亚型的标志物。我们发现FBXW 7的失活提高了黑色素瘤细胞中MITF蛋白的水平。检查FBXW 7和MITF单独或组合的损失的体外研究表明,FBXW 7是MITF/PGC-1信号传导的上游调节剂。
FBXW7 is well characterized as a tumor suppressor in many human cancers including melanoma; however, the mechanisms of tumor suppressive function have not been fully elucidated. We leveraged two distinct RNA sequencing datasets: human melanoma cell lines (n=10) with control versus silenced FBXW7 and a cohort of human melanoma tumor samples (n=51) in order to define the transcriptomic fingerprint regulated by FBXW7. Here, we report that loss of FBXW7 enhances a mitochondrial gene transcriptional program that is dependent on MITF in human melanoma and confers poor patient outcomes. MITF is a lineage-specific master regulator of melanocytes, and together with PGC-1alpha is a marker for melanoma subtypes with dependence for mitochondrial oxidative metabolism. We found that inactivation of FBXW7 elevates MITF protein levels in melanoma cells. In vitro studies examining loss of FBXW7 and MITF alone or in combination showed that FBXW7 is an upstream regulator for the MITF/PGC-1 signaling.
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