Sp1/NFkappaB/HDAC/miR-29b regulatory network in KIT-driven myeloid leukemia.

Sp1/NFkappaB/HDAC/miR-29b regulatory network in KIT-driven myeloid leukemia.
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DOI:
10.1016/j.ccr.2010.03.008
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发表时间:
2010-04-13
期刊:
影响因子:
50.3
通讯作者:
Marcucci G
Marcucci G
中科院分区:
医学1区
文献类型:
--
作者:
Liu S;Wu LC;Pang J;Santhanam R;Schwind S;Wu YZ;Hickey CJ;Yu J;Becker H;Maharry K;Radmacher MD;Li C;Whitman SP;Mishra A;Stauffer N;Eiring AM;Briesewitz R;Baiocchi RA;Chan KK;Paschka P;Caligiuri MA;Byrd JC;Croce CM;Bloomfield CD;Perrotti D;Garzon R;Marcucci G

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与急性髓性白血病(AML)亚群中发生的KIT功能获得性突变相关的KIT过表达的生物学和临床意义(即,核心结合因子AML)未知。在这里,我们发现KIT突变导致MYC依赖性miR-29 b抑制和KIT驱动的白血病中miR-29 b靶点Sp1水平增加。Sp1通过参与进一步抑制miR-29 B转录的NFκB/HDAC复合物来增强其自身的表达。然后上调的Sp1结合NFκB并反式激活KIT。因此,激活的KIT最终诱导其自身的转录。我们的研究结果提供了证据表明,Sp1/NFκB/HDAC/miR-29 b依赖性KIT过表达的机制有助于白血病的生长,并且可以通过药物破坏Sp1/NFκB/HDAC复合物或合成miR-29 B治疗KIT驱动的AML来成功靶向。
The biologic and clinical significance of KIT overexpression that associates with KIT gain-of- function mutations occurring in subsets of acute myeloid leukemia (AML) (i.e., core binding factor AML) is unknown. Here, we show that KIT mutations lead to MYC-dependent miR-29b repression and increased levels of the miR-29b target Sp1 in KIT-driven leukemia. Sp1 enhances its own expression by participating in a NFκB/HDAC complex that further represses miR-29b transcription. Upregulated Sp1 then binds NFκB and transactivates KIT. Therefore, activated KIT ultimately induces its own transcription. Our results provide evidence that the mechanisms of Sp1/NFκB/HDAC/miR-29b-dependent KIT overexpression contribute to leukemia growth and can be successfully targeted by pharmacological disruption of the Sp1/NFκB/HDAC complex or synthetic miR-29b treatment in KIT-driven AML.
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