Histone demethylase RBP2 decreases miR-21 in blast crisis of chronic myeloid leukemia.

Histone demethylase RBP2 decreases miR-21 in blast crisis of chronic myeloid leukemia.
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组蛋白去甲基化酶 RBP2 在慢性粒细胞白血病急变期降低 miR-21

DOI:
10.18632/oncotarget.2859
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发表时间:
2015-01-20
期刊:
影响因子:
--
通讯作者:
Chen C
Chen C
中科院分区:
其他
文献类型:
--
作者:
Zhou M;Zeng J;Wang X;Wang X;Huang T;Fu Y;Sun T;Jia J;Chen C

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急变期慢性髓性白血病(CML-BP)对临床治疗反应差,通常是致命的。在这项研究中,我们发现组蛋白H3赖氨酸4(H3 K4)脱甲基酶RBP 2(也称为JARID 1A和KDM 5A)在CML-BP中表达不足。RBP 2组蛋白去甲基化酶刺激白血病细胞分化并抑制细胞增殖。我们鉴定了miR-21被RBP 2直接下调,并发现miR-21下调白血病细胞中PDCD 4的表达。通过与miR-21启动子结合并通过在miR-21基因座处的三甲基化H3 K4的去甲基化,RBP 2下调miR-21表达。这反过来又激活了PDCD 4。总之,RBP 2在CML的原始细胞转化中表观遗传下调miR-21。
Chronic myeloid leukemia in the blastic phase (CML-BP) responds poorly to clinical treatments and is usually fatal. In this study, we found that the histone H3 lysine 4 (H3K4) demethylase RBP2 (also called JARID1A and KDM5A) is underexpressed in CML-BP. The RBP2 histone demethylase stimulates leukemia cell differentiation and inhibits cell proliferation. We identified miR-21 was directly downregulated by RBP2 and found that miR-21 downregulated PDCD4 expression in leukemia cells. By binding to miR-21 promoter and by demethylating of trimethylated H3K4 at the miR-21 locus, RBP2 downregulated miR-21 expression. This in turn activated PDCD4. In conclusion, RBP2 epigenetically downregulated miR-21 in blast transformation of CML.
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