A localized Wnt signal orients asymmetric stem cell division in vitro.

A localized Wnt signal orients asymmetric stem cell division in vitro.
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DOI:
10.1126/science.1231077
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发表时间:
2013-03-22
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Nusse R
Nusse R
中科院分区:
其他
文献类型:
--
作者:
Habib SJ;Chen BC;Tsai FC;Anastassiadis K;Meyer T;Betzig E;Nusse R

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Wnt 等发育信号通常以定向方式呈现给细胞。为了检查局部 Wnt 信号传导的后果,我们将 Wnt 蛋白固定在珠子上,并将它们引入培养的胚胎干细胞中。在单细胞水平上,Wnt-bead 诱导 Wnt-β-catenin 信号成分的不对称分布,定向有丝分裂平面,并指导中心体的不对称遗传。在胞质分裂完成之前,Wnt 近端子细胞表达高水平的核 β-连环蛋白和多能性基因,而远端子细胞获得分化标志。我们认为,空间受限的 Wnt 信号会诱导定向细胞分裂,从而在相对于 Wnt 源的可预测位置产生不同的细胞命运。
Developmental signals such as Wnts are often presented to cells in an oriented manner. To examine the consequences of local Wnt signaling, we immobilized Wnt proteins on beads and introduced them to embryonic stem cells in culture. At the single-cell level, the Wnt-bead induced asymmetric distribution of Wnt–β-catenin signaling components, oriented the plane of mitotic division, and directed asymmetric inheritance of centrosomes. Before cytokinesis was completed, the Wnt-proximal daughter cell expressed high levels of nuclear β-catenin and pluripotency genes, whereas the distal daughter cell acquired hallmarks of differentiation. We suggest that a spatially restricted Wnt signal induces an oriented cell division that generates distinct cell fates at predictable positions relative to the Wnt source.
不对称的中心体行为和干细胞分裂的机制。
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影响因子: --
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