USP2a alters chemotherapeutic response by modulating redox.

USP2a alters chemotherapeutic response by modulating redox.
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DOI:
10.1038/cddis.2013.289
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发表时间:
2013-09-26
影响因子:
9
通讯作者:
--
中科院分区:
生物学1区
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癌细胞的特征在于许多蛋白质的改变的泛素化。泛素特异性蛋白酶2a(USP 2a)是一种在前列腺癌中过表达的去泛素化酶,它以多种方式表现出致癌行为,包括通过miR-34 b/c簇靶向c-Myc。在这里,我们证明了USP 2a在永生化和转化的前列腺细胞中诱导耐药性。具体来说,它赋予对典型促氧化剂(例如顺铂(CDDP)和阿霉素(Doxo))以及紫杉烷类药物的耐药性。USP 2a过表达通过减少活性氧(ROS)的产生和稳定线粒体膜电位(Δ P)来保护免受药物诱导的氧化应激,从而损害下游p38激活和触发细胞凋亡。USP 2a保护功能的分子介质是谷胱甘肽(GSH)。通过miR-34 b/c驱动的c-Myc调节,USP 2a增加细胞内GSH含量,从而干扰化疗药物触发的氧化级联反应。根据这些发现,靶向Myc和/或miR-34 b/c可能会逆转化疗耐药性。
Cancer cells are characterized by altered ubiquitination of many proteins. The ubiquitin-specific protease 2a (USP2a) is a deubiquitinating enzyme overexpressed in prostate adenocarcinomas, where it exhibits oncogenic behavior in a variety of ways including targeting c-Myc via the miR-34b/c cluster. Here we demonstrate that USP2a induces drug resistance in both immortalized and transformed prostate cells. Specifically, it confers resistance to typically pro-oxidant agents, such as cisplatin (CDDP) and doxorubicin (Doxo), and to taxanes. USP2a overexpression protects from drug-induced oxidative stress by reducing reactive oxygen species (ROS) production and stabilizing the mitochondrial membrane potential (ΔΨ), thus impairing downstream p38 activation and triggering of apoptosis. The molecular mediator of the USP2a protective function is the glutathione (GSH). Through miR-34b/c-driven c-Myc regulation, USP2a increases intracellular GSH content, thus interfering with the oxidative cascade triggered by chemotherapeutic agents. In light of these findings, targeting Myc and/or miR-34b/c might revert chemo-resistance.
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