MicroRNA-210 regulates mitochondrial free radical response to hypoxia and krebs cycle in cancer cells by targeting iron sulfur cluster protein ISCU.

MicroRNA-210 regulates mitochondrial free radical response to hypoxia and krebs cycle in cancer cells by targeting iron sulfur cluster protein ISCU.
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DOI:
10.1371/journal.pone.0010345
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发表时间:
2010-04-26
期刊:
影响因子:
3.7
通讯作者:
Harris AL
Harris AL
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Favaro E;Ramachandran A;McCormick R;Gee H;Blancher C;Crosby M;Devlin C;Blick C;Buffa F;Li JL;Vojnovic B;Pires das Neves R;Glazer P;Iborra F;Ivan M;Ragoussis J;Harris AL

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癌症中的缺氧导致缺氧诱导因子1(HIF - 1)和一种微小RNA(hsa - miR - 210,简称miR - 210)上调,且与不良预后相关。 在人类癌细胞系和肿瘤中,我们发现miR - 210靶向线粒体铁硫支架蛋白ISCU,该蛋白是铁硫簇组装所必需的,铁硫簇是参与三羧酸循环、电子传递和铁代谢的关键酶的辅因子。ISCU的下调是缺氧条件下活性氧(ROS)产生的主要原因。ISCU受抑制会降低线粒体复合物1的活性和顺乌头酸酶的活性,导致在常氧条件下向糖酵解转变,并提高细胞存活率。ISCU水平低的癌症预后更差。 这些癌症主要特征的诱导表明,单一的微小RNA(miR - 210)通过铁硫簇代谢和自由基产生来调节线粒体功能,从而介导了一种适应缺氧的新机制。
Hypoxia in cancers results in the upregulation of hypoxia inducible factor 1 (HIF-1) and a microRNA, hsa-miR-210 (miR-210) which is associated with a poor prognosis. In human cancer cell lines and tumours, we found that miR-210 targets the mitochondrial iron sulfur scaffold protein ISCU, required for assembly of iron-sulfur clusters, cofactors for key enzymes involved in the Krebs cycle, electron transport, and iron metabolism. Down regulation of ISCU was the major cause of induction of reactive oxygen species (ROS) in hypoxia. ISCU suppression reduced mitochondrial complex 1 activity and aconitase activity, caused a shift to glycolysis in normoxia and enhanced cell survival. Cancers with low ISCU had a worse prognosis. Induction of these major hallmarks of cancer show that a single microRNA, miR-210, mediates a new mechanism of adaptation to hypoxia, by regulating mitochondrial function via iron-sulfur cluster metabolism and free radical generation.
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