EZH2基因或为白血病治疗新靶点

2011-07-12 MedSci原创 MedSci原创

来源:医学论坛网   新加坡一项研究显示,他们发现了一个3-Deazaneplanocin A(DZNep)介导细胞凋亡的新的分子机制,并提出EZH2基因可能是AML治疗的一个潜在的新靶点。研究报告2011年7月6日在线发表于《血液》(Blood)杂志。   DZNep是一种组蛋白甲基转移酶抑制剂。之前已经有几项研究表明,DZNep可破坏多梳基因抑制复合物2(PRC2),并优先在肿瘤

来源:医学论坛网

  新加坡一项研究显示,他们发现了一个3-Deazaneplanocin A(DZNep)介导细胞凋亡的新的分子机制,并提出EZH2基因可能是AML治疗的一个潜在的新靶点。研究报告2011年7月6日在线发表于《血液》(Blood)杂志。

  DZNep是一种组蛋白甲基转移酶抑制剂。之前已经有几项研究表明,DZNep可破坏多梳基因抑制复合物2(PRC2),并优先在肿瘤细胞中,包括在急性髓系白血病(AML)细胞中,诱导细胞凋亡。然而,人们对它根本的分子机制仍不甚了解。

  新加坡的这项研究揭示,DZNep在AML细胞系、原始细胞和靶向CD34+ CD38 -白血病干细胞(LSC)富集的亚群中,具有强诱导凋亡的能力。使用RNA干扰(RNAi)、基因表达分析和染色质免疫沉淀(ChIP)等方法,研究者发现,TXNIP,一个主要的氧化还原反应控制分子,在DZNep诱导的细胞凋亡中起着至关重要的作用。研究表明,无论是通过DZNep治疗还是EZH2基因敲除法,破坏PRC2将重新激活TXNIP、抑制硫氧还蛋白的活性并增加活性氧(ROS),从而引起细胞凋亡。此外,研究还显示,TXNIP在AML中下调,并且是PRC2介导基因沉默的直接靶点。与DZNep治疗后ROS累积相一致,研究者还观察到,内质网应激调控基因(通常与细胞存活有关)在经DZNep治疗后出现下调。

相关链接:The histone methyltransferase inhibitor DZNep upregulates TXNIP, increases ROS production, and targets leukemia cells in AML 

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    2011-10-02 fusion
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    2011-07-14 lsndxfj
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