p190-B RhoGAP regulates the functional composition of the mesenchymal microenvironment.

p190-B RhoGAP regulates the functional composition of the mesenchymal microenvironment.
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DOI:
10.1038/leu.2013.103
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发表时间:
2013-11
期刊:
影响因子:
11.4
通讯作者:
--
中科院分区:
医学1区
文献类型:
--
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造血受微环境组成部分(即所谓的生态位)的调节。在这里,我们发现小鼠中 p190-B GTP 酶激活蛋白 (p190-B) 缺失会导致个体发育过程中 p190-B−/− 胎儿肝脏和骨骼以及 p190-B+/- 成人骨骼和脾脏中的造血衰竭。这些缺陷是非细胞自主的,因为我们之前表明将 p190-B−/− 造血细胞移植到野生型宿主中会导致正常的造血作用。间充质干细胞/祖细胞 (MSC) 和野生型骨髓细胞的共培养表明,由于 Wnt 信号传导受损,p190-B−/− MSC 在支持造血功能方面出现功能障碍。此外,p190-B 缺失会导致骨髓生态位组成的改变,包括 CFU 成纤维细胞、CFU 脂肪细胞和 CFU 成骨细胞数量异常。这是由于成骨细胞和脂肪细胞谱系的 MSC 谱系命运规范发生了改变。因此,p190-B 为发育过程中的正常造血组织了功能性间充质/微环境。
Hematopoiesis is regulated by components of the microenvironment, so-called niche. Here, we show that p190-B GTPase Activating Protein (p190-B) deletion in mice causes hematopoietic failure during ontogeny, in p190-B−/− fetal liver and bones, and in p190-B+/− adult bones and spleen. These defects are non-cell autonomous, since we previously showed that transplantation of p190-B−/− hematopoietic cells into wild-type hosts leads to normal hematopoiesis. Coculture of mesenchymal stem/progenitor cells (MSC) and wild-type bone marrow cells reveals that p190-B−/− MSCs are dysfunctional in supporting hematopoiesis due to impaired Wnt signaling. Furthermore, p190-B loss causes alteration in bone marrow niche composition, including abnormal CFU-fibroblast, CFU-adipocyte and CFU-osteoblast numbers. This is due to altered MSC lineage fate specification to osteoblast and adipocyte lineages. Thus, p190-B organizes a functional mesenchymal/microenvironment for normal hematopoiesis during development.
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