Inhibition of hematopoiesis by competitive binding of transcription factor PU.1.

Inhibition of hematopoiesis by competitive binding of transcription factor PU.1.
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通过转录因子 PU.1 的竞争性结合抑制造血。

DOI:
10.1073/pnas.91.17.7932
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发表时间:
1994
影响因子:
11.1
通讯作者:
Tenen,DG
Tenen,DG
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Voso,MT;Burn,TC;Wulf,G;Lim,B;Leone,G;Tenen,DG

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转录因子已被证明在造血细胞定型和分化的编程中起“主开关”因子的作用。PU.1是转录因子Ets家族的造血特异性成员。在人骨髓富含CD 34的祖细胞中,PU.1表达在粒细胞/单核细胞分化的早期阶段上调,先于其编码CD 11b和巨噬细胞集落刺激因子受体的靶基因的表达,而PU.1在整个红细胞分化过程中以稳定水平表达。为了研究PU.1的功能,我们合成了含有特征PU.1位点的双链硫代磷酸寡核苷酸,并证明了它们特异性竞争PU.1 DNA结合的能力。当在体外添加到CD 34+细胞中时,野生型PU.1结合寡核苷酸显著阻断造血集落形成,而不再结合PU.1的突变的PU.1寡核苷酸没有特异性抑制作用。这些结果表明,PU.1在正常人骨髓生成过程中发育上调,并且PU.1的功能对于体外造血的发育至关重要。
Transcription factors have been shown to play a role as "master switch" factors in the programming of hematopoietic cell commitment and differentiation. PU.1 is a hematopoietic-specific member of the Ets family of transcription factors. In human bone marrow CD34-enriched progenitor cells, PU.1 expression was upregulated during the early phases of granulocytic/monocytic differentiation, preceding expression of its target genes encoding CD11b and the macrophage-colony-stimulating factor receptor, whereas PU.1 was expressed at stable levels throughout erythroid differentiation. To study PU.1 function, we synthesized double-stranded phosphorothioate oligonucleotides containing a characterized PU.1 site and demonstrated their ability to specifically compete for PU.1 DNA binding. When added to CD34+ cells in vitro, wild-type PU.1-binding oligonucleotides significantly blocked hematopoietic colony formation, whereas mutated PU.1 oligonucleotides which no longer bind PU.1 had no specific inhibitory effect. These results demonstrate that PU.1 is developmentally upregulated during normal human myelopoiesis and that the function of PU.1 is critical for the development of in vitro hematopoiesis.
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