Involvement of Runx1 in the down-regulation of fetal liver kinase-1 expression during transition of endothelial cells to hematopoietic cells

被引:34
作者
Hirai, H [1 ]
Samokhvalov, IM
Fujimoto, T
Nishikawa, S
Imanishi, J
Nishikawa, SI
机构
[1] Kyoto Prefectural Univ Med, Dept Microbiol, Kamigyo Ku, Kyoto 6028566, Japan
[2] RIKEN Ctr Dev Biol, Kobe, Hyogo, Japan
[3] European Mol Biol Lab, Monterotondo, Italy
关键词
D O I
10.1182/blood-2004-12-4872
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
During early mouse embryogenesis, fetal liver kinase-1 (Flk-1), a receptor for vascular endothelial growth factor, and Runx1, a runt domain transcription factor, have prerequisite roles in the generation of hematopoietic lineages. Flk-1 expression is maintained in successive stages from mesodermal to endothelial cells and is down-regulated in nascent hematopoietic cells, whereas Runx1 (Runt-related transcription factor 1) is expressed in embryonic sites of hematopoietic cell de novo generation and in practically all hematopoietic organs. Here we show that Runx1 represses Flk-1 during the development of hemogenic endothelial cells into hematopoietic cells. We established embryonic stem cell clones carrying the Venus gene, a modified version of yellow fluorescence protein, in the Runx1 locus and cultured them on 0139 cells. Flk-1(+) cells appeared on day 3.5, and Runx1(+) cells first appeared from the Flk-1(+) fraction on day 4.5. The Flk-1(+)Runx1(+) cells rapidly stopped expressing Flk-1 with further incubation and eventually gave rise to CD45(+) or TER119(+) cells. Runx1 repressed Flk-1 promoter transcriptional activity in an endothelial cell line, and this repression required intact DNA-binding and transactivating domains of Runx1 protein. The repressor activity of Runx1 on endogenous Flk-1 was also confirmed by overexpressing Runx1 in embryonic stem cell differentiation cultures. These results provide novel insight into the role of Runx1 during the development of hematopoietic cell lineages.
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页码:1948 / 1955
页数:8
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