Homeodomain transcription factor Meis1 is a critical regulator of adult bone marrow hematopoiesis.

Homeodomain transcription factor Meis1 is a critical regulator of adult bone marrow hematopoiesis.
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DOI:
10.1371/journal.pone.0087646
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Goitsuka R
Goitsuka R
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ariki R;Morikawa S;Mabuchi Y;Suzuki S;Nakatake M;Yoshioka K;Hidano S;Nakauchi H;Matsuzaki Y;Nakamura T;Goitsuka R

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骨髓中的造血干细胞具有自我更新和生成造血系统所有细胞的能力。这两种活动的平衡受造血干细胞内在调控机制以及来自微环境的外在信号的控制。在这里,我们证明了Meis1,一个参与许多胚胎发育过程的TALE家族同源结构域转录因子,在造血干细胞/祖细胞中选择性表达。在成人造血细胞中,条件性敲除Meis1导致造血干细胞/祖细胞显著减少。Meis1缺失对造血功能的抑制似乎是由于造血干细胞/祖细胞以细胞自主的方式自我更新活性受损和细胞静止减少,导致干细胞衰竭和长期造血功能缺陷。Meis1缺陷下调了pbx1依赖性造血干细胞特征基因的一个子集,表明它们在造血干细胞/祖细胞的维持中存在功能联系。这些结果表明Meis1在成人造血中的重要性。
Hematopoietic stem cells in the bone marrow have the capacity to both self-renew and to generate all cells of the hematopoietic system. The balance of these two activities is controlled by hematopoietic stem cell-intrinsic regulatory mechanisms as well as extrinsic signals from the microenvironment. Here we demonstrate that Meis1, a TALE family homeodomain transcription factor involved in numerous embryonic developmental processes, is selectively expressed in hematopoietic stem/progenitor cells. Conditional Meis1 knockout in adult hematopoietic cells resulted in a significant reduction in the hematopoietic stem/progenitor cells. Suppression of hematopoiesis by Meis1 deletion appears to be caused by impaired self-renewal activity and reduced cellular quiescence of hematopoietic stem/progenitor cells in a cell autonomous manner, resulting in stem cell exhaustion and defective long-term hematopoiesis. Meis1 deficiency down-regulated a subset of Pbx1-dependent hematopoietic stem cell signature genes, suggesting a functional link between them in the maintenance of hematopoietic stem/progenitor cells. These results show the importance of Meis1 in adult hematopoiesis.
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