Notch signaling specifies megakaryocyte development from hematopoietic stem cells.

Notch signaling specifies megakaryocyte development from hematopoietic stem cells.
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DOI:
10.1016/j.stem.2008.07.010
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发表时间:
2008-09-11
期刊:
影响因子:
23.9
通讯作者:
Gilliland DG
Gilliland DG
中科院分区:
医学1区
文献类型:
--
作者:
Mercher T;Cornejo MG;Sears C;Kindler T;Moore SA;Maillard I;Pear WS;Aster JC;Gilliland DG

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在造血系统中,Notch 信号传导部分通过 B 细胞和骨髓谱系发育的负调节来指定 T 细胞谱系的命运。然而,当使用造血干细胞与表达 Delta-like1 的 OP9 细胞(而非亲本 OP9 细胞)异型共培养时,我们意外地观察到巨核细胞的发育。通过用 γ-分泌酶抑制剂抑制 Notch 信号传导或通过显性失活 Master-mind-like1 的表达来消除这种效应。通过使用激活或抑制Notch信号传导的突变等位基因证实了Notch信号传导对于体内巨核细胞发育的重要性。这些发现表明,Notch 是巨核细胞生成的正向调节因子,并且在骨髓祖细胞的细胞命运决定中发挥着比之前预想的更为复杂的作用。
In the hematopoietic system, Notch signaling specifies T cell lineage fate, in part through negative regulation of B cell and myeloid lineage development. However, we unexpectedly observed the development of megakaryocytes when using heterotypic cocultures of hematopoietic stem cells with OP9 cells expressing Delta-like1, but not with parental OP9 cells. This effect was abrogated by inhibition of Notch signaling either with γ-secretase inhibitors or by expression of the dominant-negative Master-mind-like1. The importance of Notch signaling for megakaryopoietic development in vivo was confirmed by using mutant alleles that either activate or inhibit Notch signaling. These findings indicate that Notch is a positive regulator of megakaryopoiesis and plays a more complex role in cell-fate decisions among myeloid progenitors than previously appreciated.
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