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Oncotarget:陆东东课题组发现miR372促进组蛋白去甲基化酶JMJD2A产生的剪接体JMJD2AΔ激活肝癌细胞中癌蛋白Pim1的活性

2017-04-21 佚名 同济大学生命科学与技术学院

组蛋白的甲基化修饰调控了染色质的结构,所以在大多数癌症发生过程中显示组蛋白甲基化的异常改变,这与组蛋白甲基化转移酶和去甲基化酶的功能失调密切相关。最近陆东东教授课题组发现组蛋白去甲基化酶JMJD2A通过表观遗传学机制在转录水平上促进了miR372先体的产生,并进一步导致了前体miR372的成熟。进一步研究显示,过量的 miR372能抑制JMJD2A第13外显子右翼和第14外显子左翼特异区域的DNA

组蛋白的甲基化修饰调控了染色质的结构,所以在大多数癌症发生过程中显示组蛋白甲基化的异常改变,这与组蛋白甲基化转移酶和去甲基化酶的功能失调密切相关。最近陆东东教授课题组发现组蛋白去甲基化酶JMJD2A通过表观遗传学机制在转录水平上促进了miR372先体的产生,并进一步导致了前体miR372的成熟。进一步研究显示,过量的 miR372能抑制JMJD2A第13外显子右翼和第14外显子左翼特异区域的DNA甲基化,从而阻碍了绝缘分子CTCF与此位点的结合,减少了第13外显子右翼和第14外显子左翼间形成的DNA环(LOOP),并减少了DNA 环中内含子剪切复合物CTCF-HP1α-AGOI的形成,阻碍了第13外显子-内含子-第14外显子间的内含子剪切,最终产生了一个新的JMJD2A剪接体JMJD2AΔ。有意义的是,JMJD2A依赖JMJD2AΔ在转录水平上抑制了P21(WAF1/Cip1)表达,从而激活了肝癌细胞中癌蛋白Pim1。进一步研究显示,JMJD2A通过Pim1促进了细胞周期蛋白CDK2、CyclinE、ppRB间的相互作用,并上调了癌蛋白C-myc的表达 。重要的是, Pim1敲低 和 P21(WAF1/Cip1) 过量后完全废除了JMJD2A的癌性功能。我们的研究提示过量的JMJD2A通过miR372-JMJD2AΔ-P21(WAF1/ Cip1)-Pim1-C-myc 信号通路加剧了肝癌细胞周期的进展。

研究论文“HistoneH3 demethylase JMJD2A promotes growth of liver cancer cells through up-regulating miR372 ”于2017年4月13日在线发表在影响因子为5.008的《Oncotarget》(Published: April 13, 2017)。研三学生安佳慧同学为第一作者,许洁、李姣、贾松、李晓楠、卢亚男、杨玉欣、林卓佳、辛晓茹、吴梦颖、郑启迪、浦浒、桂馨、李天明参与了该研究。该研究分别得到了国家自然基金 (NCSF No.8127229181272291、NCSF No.81572773)和上海市科委基础重点项目 (No13JC1405500-13JC1405501.13JC1405500-13JC1405501)的资助。

原始出处:

Jiahui An, Jie Xu, Jiao Li, et al.HistoneH3 demethylase JMJD2A promotes growth of liver cancer cells through up-regulating miR372.doi: 10.18632/oncotarget.17095

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    2017-06-25 闆锋旦
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    2017-08-08 smallant2002
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    2017-04-23 yxch36
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    2017-04-23 xqptu

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