CBFβ-SMMHC Inhibition Triggers Apoptosis by Disrupting MYC Chromatin Dynamics in Acute Myeloid Leukemia.

CBFβ-SMMHC Inhibition Triggers Apoptosis by Disrupting MYC Chromatin Dynamics in Acute Myeloid Leukemia.
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DOI:
10.1016/j.cell.2018.05.048
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发表时间:
2018-06-28
期刊:
影响因子:
64.5
通讯作者:
Castilla LH
Castilla LH
中科院分区:
生物学1区
文献类型:
--
作者:
Pulikkan JA;Hegde M;Ahmad HM;Belaghzal H;Illendula A;Yu J;O'Hagan K;Ou J;Muller-Tidow C;Wolfe SA;Zhu LJ;Dekker J;Bushweller JH;Castilla LH

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The fusion oncoprotein CBFβ-SMMHC, expressed in leukemia cases with chromosome 16 inversion, drives leukemia development and maintenance by altering the activity of the transcription factor RUNX1. Here we demonstrate that CBFβ-SMMHC maintains cell viability by neutralizing RUNX1-mediated repression of MYC expression. Upon pharmacologic inhibition of the CBFβ-SMMHC/RUNX1 interaction, RUNX1 shows increased binding at three MYC distal enhancers. There it represses MYC expression by mediating the replacement of SWI/SNF complex component BRG1 with polycomb-repressive complex component RING1B, leading to apoptosis. Combining the CBFβ-SMMHC inhibitor with the BET- inhibitor JQ1 eliminates inv(16) leukemia in human cells and a mouse model. Enhancer-interaction analysis indicated that the three enhancers are physically connected with the MYC promoter, and genome-editing analysis demonstrated that they are functionally implicated in deregulation of MYC expression. This study reveals a mechanism whereby CBFβ-SMMHC drives leukemia maintenance, and suggests that inhibitors targeting chromatin activity may prove effective in inv(16) leukemia therapy.
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