Hair follicle stem cells are specified and function in early skin morphogenesis.

Hair follicle stem cells are specified and function in early skin morphogenesis.
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DOI:
10.1016/j.stem.2008.05.009
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发表时间:
2008-07-03
期刊:
影响因子:
23.9
通讯作者:
Fuchs E
Fuchs E
中科院分区:
医学1区
文献类型:
--
作者:
Nowak JA;Polak L;Pasolli HA;Fuchs E

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在成人皮肤中,上皮性毛囊干细胞(SCs)存在于一个静止的缝隙中,对于周期性的毛发生长是必不可少的。利基建筑在出生后第一个毛发周期开始时就变得明显起来。SC是否存在或更早发挥作用尚不清楚。在这里,我们发现静止细胞出现在皮肤发育的早期,表达SC标记,后来形成成年SC群体。为了测试早期静止细胞是否具有干细胞的功能,我们使用Sox9-Cre进行遗传标记,并使用K14-Cre对Sox9进行胚胎消融,Sox9是一个重要的成年SC基因。我们发现,表达Sox9的细胞的后代对所有皮肤上皮细胞系都有贡献,并且Sox9是SC所必需的。在缺乏早期干细胞的情况下,毛囊和皮脂腺的形态发生受阻,表皮伤口修复受到影响。这些发现证实了早期毛囊干细胞的存在,并揭示了它们在组织形态发生中的生理意义。
In adult skin, epithelial hair follicle stem cells (SCs) reside in a quiescent niche and are essential for cyclic bouts of hair growth. Niche architecture becomes pronounced postnatally at the start of the first hair cycle. Whether SCs exist or function earlier is unknown. Here we show that quiescent cells appear early in skin development, express SC markers, and later give rise to the adult SC population. To test whether early quiescent cells function as SCs, we use Sox9-Cre for genetic marking and K14-Cre to embryonically ablate Sox9, an essential adult SC gene. We find that the progeny of Sox9-expressing cells contribute to all skin epithelial lineages and Sox9 is required for SC specification. In the absence of early SCs, hair follicle and sebaceous gland morphogenesis is blocked and epidermal wound repair is compromised. These findings establish the existence of early hair follicle SCs and reveal their physiological importance in tissue morphogenesis.
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