PU.1 regulates the commitment of adult hematopoietic progenitors and restricts granulopoiesis.

PU.1 regulates the commitment of adult hematopoietic progenitors and restricts granulopoiesis.
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DOI:
10.1084/jem.20050075
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发表时间:
2005-05-02
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Nutt SL
Nutt SL
中科院分区:
其他
文献类型:
--
作者:
Dakic A;Metcalf D;Di Rago L;Mifsud S;Wu L;Nutt SL

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尽管转录因子pu.1对于胎儿淋巴细胞层是必不可少的,但我们出乎意料地发现,成年小鼠中的基因消除允许造成造血症,以粒细胞的产生为主。淋巴细胞的产生受损在PU.1缺陷骨髓(BM)中是显而易见的,但是对粒细胞刺激因子或白介素-3的响应良好,骨髓细胞和克隆性粒细胞祖细胞显着增加。流式细胞仪无法识别可识别的常见淋巴样或髓样祖细胞群体。然而,克隆生成测定表明,爆炸菌落形成细胞和BM嵌合体的总体频率增加显示存在长期自我更新的PU.1缺陷型细胞,这需要PU.1用于淋巴样但不需要粒细胞,但不是粒细胞。 PU.1粒细胞 - 巨噬细胞祖细胞中的缺失,但没有常见的髓样祖细胞,导致过量的粒细胞产生。这表明PU.1在髓样发育的不同阶段的特定作用。这些发现强调了成年造血的独特性质,并揭示了PU.1调节多能淋巴样和髓样区室的规范和限制,而不是促进颗粒。
Although the transcription factor PU.1 is essential for fetal lymphomyelopoiesis, we unexpectedly found that elimination of the gene in adult mice allowed disturbed hematopoiesis, dominated by granulocyte production. Impaired production of lymphocytes was evident in PU.1-deficient bone marrow (BM), but myelocytes and clonogenic granulocytic progenitors that are responsive to granulocyte colony-stimulating factor or interleukin-3 increased dramatically. No identifiable common lymphoid or myeloid progenitor populations were discernable by flow cytometry; however, clonogenic assays suggested an overall increased frequency of blast colony-forming cells and BM chimeras revealed existence of long-term self-renewing PU.1-deficient cells that required PU.1 for lymphoid, but not granulocyte, generation. PU.1 deletion in granulocyte-macrophage progenitors, but not in common myeloid progenitors, resulted in excess granulocyte production; this suggested specific roles of PU.1 at different stages of myeloid development. These findings emphasize the distinct nature of adult hematopoiesis and reveal that PU.1 regulates the specification of the multipotent lymphoid and myeloid compartments and restrains, rather than promotes, granulopoiesis.
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