Secretion of shh by a neurovascular bundle niche supports mesenchymal stem cell homeostasis in the adult mouse incisor.

Secretion of shh by a neurovascular bundle niche supports mesenchymal stem cell homeostasis in the adult mouse incisor.
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DOI:
10.1016/j.stem.2013.12.013
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发表时间:
2014-02-06
期刊:
影响因子:
23.9
通讯作者:
Chai, Yang
Chai, Yang
中科院分区:
医学1区
文献类型:
--
作者:
Zhao, Hu;Feng, Jifan;Seidel, Kerstin;Shi, Songtao;Klein, Ophir;Sharpe, Paul;Chai, Yang

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间充质干细胞(MSC)通常由其体外特征定义,因此MSC的体内身份及其小生境知之甚少。为了解决这个问题,我们在小鼠切牙模型中使用谱系追踪,并将神经血管束(NVB)确定为MSC生态位。我们发现NVB感觉神经分泌Shh蛋白,该蛋白激活动脉周围细胞中的Gli 1表达,该细胞有助于所有间充质衍生物。这些动脉周围细胞不表达用于体外定义MSC的经典MSC标记物。相比之下,NG 2+周细胞代表来自Gli 1+细胞的MSC亚群;它们表达经典的MSC标志物,对体内平衡贡献不大,但积极参与损伤修复。同样,切牙Gli 1+细胞而非NG 2+细胞在体外表现出典型的MSC特征。总的来说,我们证明,MSC起源于动脉周围细胞和调节的Shh分泌从NVB。
Mesenchymal stem cells (MSCs) are typically defined by their in vitro characteristics, and as a consequence the in vivo identity of MSCs and their niches are poorly understood. To address this issue, we used lineage tracing in a mouse incisor model and identified the neurovascular bundle (NVB) as an MSC niche. We found that NVB sensory nerves secrete Shh protein, which activates Gli1 expression in periarterial cells that contribute to all mesenchymal derivatives. These periarterial cells do not express classical MSC markers used to define MSCs in vitro. In contrast, NG2+ pericytes represent an MSC subpopulation derived from Gli1+ cells; they express classical MSC markers and contribute little to homeostasis but are actively involved in injury repair. Likewise, incisor Gli1+ cells but not NG2+ cells exhibit typical MSC characteristics in vitro. Collectively, we demonstrate that MSCs originate from periarterial cells and are regulated by Shh secretion from a NVB.
组织干细胞:新工具和功能多样性。
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