Abnormal hair development and apparent follicular transformation to mammary gland in the absence of hedgehog signaling.

Abnormal hair development and apparent follicular transformation to mammary gland in the absence of hedgehog signaling.
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在没有刺猬信号的情况下,头发发育异常和明显的卵泡转化向乳腺。

DOI:
10.1016/j.devcel.2006.12.006
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发表时间:
2007-01
期刊:
影响因子:
11.8
通讯作者:
Linde, Anders
Linde, Anders
中科院分区:
生物学1区
文献类型:
--
作者:
Gritli-Linde, Amel;Hallberg, Kristina;Harfe, Brian D.;Reyahi, Azadeh;Kannius-Janson, Marie;Nilsson, Jeanette;Cobourne, Martyn T.;Sharpe, Paul T.;McMahon, Andrew P.;Linde, Anders

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我们发现,去除皮肤上皮细胞的Shh信号转导Smoothened的结果在间充质中过量的Shh水平。此外,我们观察到的表型反映了减少的上皮Shh信号传导,但增加的间充质Shh信号传导。例如,后者有助于旺盛的毛囊(HF)诱导,而前者耗尽所产生的毛囊干细胞龛。这种小生境的破坏显然也允许剩余的干细胞在不适当的时间启动毛发形成。因此,毛发周期的时间结构可能取决于生态位的物理结构。最后,我们发现,消融上皮Shh信号导致意想不到的转变:滤泡外根鞘采取的表皮字符,和某些高频完全消失,通过了惊人的乳腺样的命运。总的来说,我们的研究揭示了一个多方面的功能,嘘在雕刻和维护的完整性和身份的发展HF。
We show that removing the Shh signal tranducer Smoothened from skin epithelium secondarily results in excess Shh levels in the mesenchyme. Moreover, the phenotypes we observe reflect decreased epithelial Shh signaling, yet increased mesenchymal Shh signaling. For example, the latter contributes to exuberant hair follicle (HF) induction, while the former depletes the resulting follicular stem cell niches. This disruption of the niche apparently also allows the remaining stem cells to initiate hair formation at inappropriate times. Thus, the temporal structure of the hair cycle may depend on the physical structure of the niche. Finally, we find that the ablation of epithelial Shh signaling results in unexpected transformations: the follicular outer root sheath takes on an epidermal character, and certain HFs disappear altogether, having adopted a strikingly mammary gland-like fate. Overall, our study uncovers a multifaceted function for Shh in sculpting and maintaining the integrity and identity of the developing HF.
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