The basement membrane of hair follicle stem cells is a muscle cell niche.

The basement membrane of hair follicle stem cells is a muscle cell niche.
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DOI:
10.1016/j.cell.2011.01.014
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发表时间:
2011-02-18
期刊:
影响因子:
64.5
通讯作者:
Watt FM
Watt FM
中科院分区:
生物学1区
文献类型:
--
作者:
Fujiwara H;Ferreira M;Donati G;Marciano DK;Linton JM;Sato Y;Hartner A;Sekiguchi K;Reichardt LF;Watt FM

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表皮中的毛囊隆突与立毛肌(APM)相关联,立毛肌负责毛发直立(通常称为“鸡皮疙瘩”)。我们发现,隆突干细胞将肾连蛋白沉积到基底膜中,介导了表达α8β1整合素的间充质细胞(包括APM祖细胞)的选择性黏附。肾连蛋白诱导α8整合素阳性细胞上调平滑肌标志物。在缺乏肾连蛋白的皮肤中,APM的数量减少,且形成的APM插入到隆突上方,此处肾连蛋白家族成员EGFL6出现代偿性上调。α8整合素的缺失也消除了APM锚定于隆突的选择性。肾连蛋白是一个Wnt靶基因;表皮β -连环蛋白的激活会上调表皮肾连蛋白和真皮α8整合素的表达。我们得出结论,通过表达肾连蛋白,隆突干细胞为平滑肌细胞提供了一个微环境,并作为立毛肌的肌腱细胞发挥作用。这些结果还揭示了基底膜异质性在组织模式形成中的功能作用。
The hair follicle bulge in the epidermis associates with the arrector pili muscle (APM) that is responsible for piloerection (commonly called "goosebumps"). We show that deposition of nephronectin into the basement membrane by bulge stem cells mediates selective adhesion of α8β1 integrin-expressing mesenchymal cells, including APM progenitors. Nephronectin induces α8 integrin-positive cells to upregulate smooth muscle markers. In nephronectin-null skin, the number of APM is reduced and those that form insert above the bulge, where there is compensatory upregulation of the nephronectin family member EGFL6. Deletion of α8 integrin also abolishes the selectivity of APM anchorage to the bulge. Nephronectin is a Wnt target gene; epidermal β-catenin activation upregulates epidermal nephronectin and dermal α8 integrin expression. We conclude that by expressing nephronectin bulge stem cells provide a smooth muscle cell niche and act as tendon cells for the APM. The results also reveal a functional role for basement membrane heterogeneity in tissue patterning.
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