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Coordinated Silencing of MYC-Mediated miR-29 by HDAC3 and EZH2 as a Therapeutic Target of Histone Modification in Aggressive B-Cell Lymphomas

机译:HDAC3和EZH2协同沉默MYC介导的miR-29作为侵袭性B细胞淋巴瘤中组蛋白修饰的治疗靶标

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摘要

We investigated the transcriptional and epigenetic repression of miR-29 by MYC, HDAC3, and EZH2 in mantle cell lymphoma and other MYC-associated lymphomas. We demonstrate that miR-29 is repressed by MYC through a corepressor complex with HDAC3 and EZH2. MYC contributes to EZH2 upregulation via repression of the EZH2 targeting miR-26a, and EZH2 induces MYC via inhibition of the MYC targeting miR-494 to create positive feedback. Combined inhibition of HDAC3 and EZH2 cooperatively disrupted the MYC-EZH2-miR-29 axis, resulting in restoration of miR-29 expression, downregulation of miR-29-targeted genes, and lymphoma growth suppression in vitro and in vivo. These findings define a MYC-mediated miRNA repression mechanism, shed light on MYC lymphomagenesis mechanisms, and reveal promising therapeutic targets for aggressive B-cell malignancies.
机译:我们调查了套细胞淋巴瘤和其他与MYC相关的淋巴瘤中MYC,HDAC3和EZH2对miR-29的转录和表观遗传抑制。我们证明,通过与HDAC3和EZH2的corepressor复合体,MYC可以抑制miR-29。 MYC通过抑制靶向EZH2的miR-26a促进EZH2上调,而EZH2通过抑制靶向MYR-494的MYC诱导MYC产生正反馈。联合抑制HDAC3和EZH2协同破坏了MYC-EZH2-miR-29轴,导致miR-29表达恢复,miR-29靶向基因的下调以及体内外淋巴瘤的生长抑制。这些发现定义了MYC介导的miRNA抑制机制,阐明了MYC淋巴瘤的发生机制,并揭示了侵略性B细胞恶性肿瘤的有希望的治疗靶标。

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