Mitofusin-2 mediates doxorubicin sensitivity and acute resistance in Jurkat leukemia cells.

Mitofusin-2 mediates doxorubicin sensitivity and acute resistance in Jurkat leukemia cells.
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DOI:
10.1016/j.bbrep.2020.100824
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发表时间:
2020-12
影响因子:
2.7
通讯作者:
Hernandez JB
Hernandez JB
中科院分区:
其他
文献类型:
--
作者:
Decker CW;Garcia J;Gatchalian K;Arceneaux D;Choi C;Han D;Hernandez JB

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线粒体沿着一个形态连续体从碎片化的个体单位到超灌注的管状网络振荡。它们在分解代谢和合成代谢的交界处的位置将这种称为线粒体动力学的形态可塑性与更大的细胞代谢程序相结合,这反过来又将线粒体与许多疾病状态相关联。在许多癌症中,破碎的线粒体使细胞具有有氧糖酵解的生物合成能力,以服务于增殖和进展。然而,化学抗性癌症有利于重塑动力学,其通过电子传递链(ETC)利用氧化磷酸化(OXPHOS)产生融合的线粒体组装体。在这项研究中,发现线粒体融合的一种GTdR蛋白介导物Mitofusin-2(MFN-2)的表达与多柔比星(DxR)攻击后Jurkat白血病细胞的存活密切相关。此外,这伴随着OXPHOS呼吸复合物和ATP合酶的表达显著增加,以及III态呼吸和呼吸控制率(RCR)的相应增加。重要的是,与经处理的野生型对照相比,MFN-2的CRISPR敲除导致多柔比星(DxR)的半数致死剂量显著降低,表明线粒体融合在化疗敏感性和急性抗性中的重要作用。阿霉素诱导存活的Jurkat细胞中的线粒体融合存活细胞中的线粒体融合增加呼吸和线粒体偶联Mitofusin-2敲除使细胞对阿霉素敏感
Mitochondria oscillate along a morphological continuum from fragmented individual units to hyperfused tubular networks. Their position at the junction of catabolic and anabolic metabolism couples this morphological plasticity, called mitochondrial dynamics, to larger cellular metabolic programs, which in turn implicate mitochondria in a number of disease states. In many cancers, fragmented mitochondria engage the cell with the biosynthetic capacity of aerobic glycolysis in service of proliferation and progression. Chemo-resistant cancers, however, favor remodeling dynamics that yield fused mitochondrial assemblies utilizing oxidative phosphorylation (OXPHOS) through the electron transport chain (ETC). In this study, expression of Mitofusin-2 (MFN-2), a GTPase protein mediator of mitochondrial fusion, was found to closely correlate to Jurkat leukemia cell survival post doxorubicin (DxR) assault. Moreover, this was accompanied by dramatically increased expression of OXPHOS respiratory complexes and ATP Synthase, as well as a commensurate escalation of state III respiration and respiratory control ratio (RCR). Importantly, CRISPR knockout of MFN-2 resulted in a considerable decrease of doxorubicin (DxR) median lethal dose compared to a treated wildtype control, suggesting an important role of mitochondrial fusion in chemotherapy sensitivity and acute resistance. Doxorubicin induces mitochondrial fusion in surviving jurkat cells Fused mitochondria in surviving cells increase respiration and mitochondria coupling Mitofusin-2 knockout sensitizes cells to doxorubicin
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