Msi2 Maintains Quiescent State of Hair Follicle Stem Cells by Directly Repressing the Hh Signaling Pathway.

Msi2 Maintains Quiescent State of Hair Follicle Stem Cells by Directly Repressing the Hh Signaling Pathway.
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Msi2 通过直接抑制 Hh 信号通路维持毛囊干细胞的静态状态

DOI:
10.1016/j.jid.2017.01.012
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发表时间:
2017-05
期刊:
The Journal of investigative dermatology
影响因子:
--
通讯作者:
Yu Z
Yu Z
中科院分区:
其他
文献类型:
--
作者:
Ma X;Tian Y;Song Y;Shi J;Xu J;Xiong K;Li J;Xu W;Zhao Y;Shuai J;Chen L;Plikus MV;Lengner CJ;Ren F;Xue L;Yu Z

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毛囊(HF)经历精确调节的主动再生周期,包括(生长期)、退化期(退化期)和相对静止期(休止期)。HF干细胞(HFSCs)在再生循环中起着重要作用。阐明控制HFSC行为的机制可以帮助揭示毛发发育、毛发生长障碍和皮肤癌的基本原理。Musashi(Msi)的RNA结合蛋白与不同干细胞类型的生物学有关,但尚未在HFSC中进行研究。在这里,我们利用获得和丧失功能的小鼠模型来证明,强制MSI 2表达延缓了毛发生长期的进入,从而延迟了毛发生长,而MSI 2的丧失增强了毛发再生。此外,我们的研究结果表明,Msi 2维持HFSCs的静止状态,在休止期到生长期的过渡过程中。在分子水平上,我们的无偏转录组分析显示Msi 2抑制Hh信号传导活性,并且Shh是其在HF中的直接靶标。总而言之,我们的研究结果揭示了Msi 2在抑制毛发再生和维持HFSC静止方面的重要性。以前未报道的Msi 2-Shh-Gli 1通路增加了对控制周期性毛发生长的复杂网络的理解。
Hair follicles (HFs) undergo precisely regulated cycles of active regeneration consisting of (anagen), involution (catagen), and relative quiescence (telogen) phases. HF stem cells (HFSCs) play important roles in regenerative cycling. Elucidating mechanisms that governs HFSC behavior can help uncover the underlying principles of hair development, hair growth disorders and skin cancers. RNA-binding proteins of the Musashi (Msi) have been implicated in the biology of different stem cell types, yet they have not been studied in HFSCs. Here we utilized gain- and loss-of-function mouse models to demonstrate that forced MSI2 expression retards anagen entry and consequently, delays hair growth, while loss of Msi2 enhances hair regrowth. Further, our findings show that Msi2 maintains quiescent state of HFSCs in the process of telogen-to-anagen transition. At the molecular level, our unbiased transcriptome profiling shows that Msi2 represses Hh signaling activity and that Shh is its direct target in the HF. Taken together, our findings reveal the importance of Msi2 in suppressing hair regeneration and maintaining HFSC quiescence. Previously unreported Msi2-Shh-Gli1 pathway adds to the growing understanding of the complex network governing cyclic hair growth.
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