JunB protects against myeloid malignancies by limiting hematopoietic stem cell proliferation and differentiation without affecting self-renewal.

JunB protects against myeloid malignancies by limiting hematopoietic stem cell proliferation and differentiation without affecting self-renewal.
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DOI:
10.1016/j.ccr.2009.02.016
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发表时间:
2009-04-07
期刊:
影响因子:
50.3
通讯作者:
Passegué E
Passegué E
中科院分区:
医学1区
文献类型:
--
作者:
Santaguida M;Schepers K;King B;Sabnis AJ;Forsberg EC;Attema JL;Braun BS;Passegué E

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JunB/AP-1转录因子的缺失会导致一种源于造血干细胞(HSC)的骨髓增生性疾病(MPD)。现在我们发现,JunB失活解除了细胞周期机制的调控,增加了长期再充填的HSCs(LT-HSCs)的增殖,而不会损害其在体内的自我更新或再生能力。我们发现,JunB缺失破坏了一个复杂的基因和路径网络的稳定性,这些基因和路径通常限制髓样细胞的分化,导致对Notch和转化生长因子-β信号的反应减弱,部分原因是Hes1基因转录失控。这些结果表明,LT-HSC的增殖和分化与自我更新无关,并建立了JunB正常情况下限制髓系祖细胞产生从而防止髓系恶性肿瘤发生的一些机制。
Loss of the JunB/AP-1 transcription factor induces a myeloproliferative disease (MPD) arising from the hematopoietic stem cell (HSC) compartment. Now we show that JunB inactivation deregulates the cell cycle machinery and increases the proliferation of long-term repopulating HSCs (LT-HSCs) without impairing their self-renewal or regenerative potential in vivo. We found that JunB loss destabilizes a complex network of genes and pathways that normally limit myeloid differentiation, leading to impaired responsiveness to both Notch and TGF-β signaling due, in part, to transcriptional deregulation of the Hes1 gene. These results demonstrate that LT-HSC proliferation and differentiation are uncoupled from self-renewal, and establish some of the mechanisms by which JunB normally limits the production of myeloid progenitors hence preventing initiation of myeloid malignancies.
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