首页> 美国卫生研究院文献>The Journal of Experimental Medicine >Genetically distinct leukemic stem cells in human CD34− acute myeloid leukemia are arrested at a hemopoietic precursor-like stage
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Genetically distinct leukemic stem cells in human CD34− acute myeloid leukemia are arrested at a hemopoietic precursor-like stage

机译:人类CD34-急性髓细胞性白血病中遗传上不同的白血病干细胞停滞在造血前体样阶段

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摘要

Our understanding of the perturbation of normal cellular differentiation hierarchies to create tumor-propagating stem cell populations is incomplete. In human acute myeloid leukemia (AML), current models suggest transformation creates leukemic stem cell (LSC) populations arrested at a progenitor-like stage expressing cell surface CD34. We show that in ∼25% of AML, with a distinct genetic mutation pattern where >98% of cells are CD34, there are multiple, nonhierarchically arranged CD34+ and CD34 LSC populations. Within CD34 and CD34+ LSC–containing populations, LSC frequencies are similar; there are shared clonal structures and near-identical transcriptional signatures. CD34 LSCs have disordered global transcription profiles, but these profiles are enriched for transcriptional signatures of normal CD34 mature granulocyte–macrophage precursors, downstream of progenitors. But unlike mature precursors, LSCs express multiple normal stem cell transcriptional regulators previously implicated in LSC function. This suggests a new refined model of the relationship between LSCs and normal hemopoiesis in which the nature of genetic/epigenetic changes determines the disordered transcriptional program, resulting in LSC differentiation arrest at stages that are most like either progenitor or precursor stages of hemopoiesis.
机译:我们对正常的细胞分化层次的扰动以创建肿瘤传播的干细胞群体的理解是不完整的。在人类急性髓细胞性白血病(AML)中,当前模型表明转化产生了白血病干细胞(LSC)群体,该群体在表达细胞表面CD34的祖先样阶段被捕。我们发现,在约25%的AML中,具有明显的基因突变模式,其中> 98%的细胞是CD34 -,其中有多个非分层排列的CD34 + 和CD34 - LSC人口。在包含LSC的CD34 -和CD34 + 群体中,LSC频率相似。有共享的克隆结构和几乎相同的转录特征。 CD34 - LSCs的整体转录谱无序,但这些谱丰富了正常CD34 -成熟粒细胞-巨噬细胞前体在祖细胞下游的转录特征。但是,与成熟的前体不同,LSC表达以前与LSC功能有关的多种正常干细胞转录调节因子。这暗示了LSC与正常造血之间关系的新的改进模型,其中遗传/表观遗传学改变的性质决定了无序的转录程序,导致LSC分化停滞在最类似于造血的祖先阶段或前体阶段。

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