Dll1+ secretory progenitor cells revert to stem cells upon crypt damage.

Dll1+ secretory progenitor cells revert to stem cells upon crypt damage.
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DOI:
10.1038/ncb2581
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发表时间:
2012-10
影响因子:
21.3
通讯作者:
--
中科院分区:
生物学1区
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--
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Lgr5干细胞位于小肠隐窝底部,可产生肠上皮细胞和分泌细胞谱系。进入后一种上皮谱系需要Notch信号通路沉默。Notch配体Dll1在一小部分紧邻干细胞的子代细胞中强烈上调。利用一种新型Dll1GFP - ires - CreERT2基因敲入小鼠进行的谱系追踪显示,单个高表达Dll1的细胞可产生所有四种分泌细胞类型的小型、短寿命克隆。在培养过程中,经过分选的高表达Dll1的细胞在短暂接触Wnt3A时可形成长期存活的类器官。当在组织损伤前对Dll1细胞进行基因标记时,会出现大量的干细胞追踪事件。因此,谱系特化在最早的干细胞子代中就已通过Notch侧向抑制发生。然而,特化的分泌祖细胞具有可塑性,在组织损伤时可重新获得干性。
Lgr5 stem cells reside at small intestinal crypt bottoms, generating both the enterocyte and secretory lineage. Entry into the latter epithelial lineage requires silencing of Notch signaling. The Notch ligand Dll1 is strongly up-regulated in a small subset of immediate stem cell daughters. Lineage tracing utilizing a novel Dll1GFP-ires-CreERT2 knock-in mouse reveals that single Dll1high cells generate small, short-lived clones of all four secretory cell types. In culture, sorted Dll1high cells can form long-lived organoids when briefly exposed to Wnt3A. When Dll1 cells are genetically marked prior to tissue damage, significant numbers of stem cell tracing events occur. Lineage specification therefore occurs already in the earliest stem cell daughters through Notch lateral inhibition. Yet, specified secretory progenitors display plasticity and can regain stemness upon tissue damage.
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