Tcf3 and Tcf4 are essential for long-term homeostasis of skin epithelia.

Tcf3 and Tcf4 are essential for long-term homeostasis of skin epithelia.
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DOI:
10.1038/ng.431
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发表时间:
2009-10
期刊:
影响因子:
30.8
通讯作者:
Fuchs, Elaine
Fuchs, Elaine
中科院分区:
生物学1区
文献类型:
--
作者:
Nguyen, Hoang;Merrill, Bradley J.;Polak, Lisa;Nikolova, Maria;Rendl, Michael;Shaver, Timothy M.;Pasolli, H. Amalia;Fuchs, Elaine

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单层胚胎皮肤要么分层形成表皮,要么对WNT信号(稳定的β-连环蛋白)做出反应,形成毛囊。出生后,干细胞继续差异地使用Wnt信号来维持组织的长期动态平衡。我们发现胚胎祖细胞和出生后毛囊干细胞共表达Tcf3和TCF4,它们可以作为转录激活或抑制因子。利用功能丧失研究和转录分析,我们发现皮肤中缺乏TCF3和TCF4的后果与β-连环蛋白缺乏引起的后果只有部分重叠。我们确定了Tcf3和TCF4在表皮和毛囊的长期维持和伤口修复中的作用,表明Tcf蛋白在谱系决定中既有Wnt依赖的作用,也有Wnt非依赖的作用。
Single-layered embryonic skin either stratifies to form epidermis or responds to Wnt signaling (stabilized β-catenin) to form hair follicles. Postnatally, stem cells continue to differentially use Wnt signaling in long-term tissue homeostasis. We have discovered that embryonic progenitor cells and postnatal hair follicle stem cells coexpress Tcf3 and Tcf4, which can act as transcriptional activators or repressors. Using loss-of-function studies and transcriptional analyses, we uncovered consequences to the absence of Tcf3 and Tcf4 in skin that only partially overlap with those caused by β-catenin deficiency. We established roles for Tcf3 and Tcf4 in long-term maintenance and wound repair of both epidermis and hair follicles, suggesting that Tcf proteins have both Wnt-dependent and Wnt-independent roles in lineage determination.
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