Lgr5+ cells regenerate hair cells via proliferation and direct transdifferentiation in damaged neonatal mouse utricle.

Lgr5+ cells regenerate hair cells via proliferation and direct transdifferentiation in damaged neonatal mouse utricle.
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损伤招募的 Lgr5 细胞通过新生小鼠子宫内增殖和直接转分化再生毛细胞

DOI:
10.1038/ncomms7613
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发表时间:
2015-04-07
影响因子:
16.6
通讯作者:
Cheng, Alan G.
Cheng, Alan G.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Wang, Tian;Chai, Renjie;Kim, Grace S.;Pham, Nicole;Jansson, Lina;Duc-Huy Nguyen;Kuo, Bryan;May, Lindsey A.;Zuo, Jian;Cunningham, Lisa L.;Cheng, Alan G.

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内源祖细胞的募集在组织修复过程中至关重要。内耳椭圆囊需要机械感觉毛细胞 (HC) 来检测线性加速度。受损后,非哺乳动物椭圆囊通过增殖和直接转分化再生 HC。在成年哺乳动物中,来自不明祖细胞的有限转分化发生,以再生出纹外 II 型 HC。在这里,我们发现新生小鼠椭圆囊中的 HC 损伤会激活纹状体支持细胞中的 Wnt 靶基因 Lgr5。谱系追踪和延时显微镜显示 Lgr5+ 细胞在体外转分化为 HC 样细胞。与成人相比,新生儿椭圆囊体内的 HC 消融会招募 Lgr5+ 细胞,通过有丝分裂和转分化途径再生纹状体 HC。 I 型和 II 型 HC 都会再生,再生的 HC 会显示静纤毛和突触。最后,Lgr5+ 细胞中稳定的 β-连环蛋白可增强有丝分裂活性和 HC 再生。因此,Lgr5 标记 Wnt 调节的、损伤激活的 HC 祖细胞,并可能有助于揭示驱动哺乳动物 HC 再生的因素。
Recruitment of endogenous progenitors is critical during tissue repair. The inner ear utricle requires mechanosensory hair cells (HCs) to detect linear acceleration. After damage, non-mammalian utricles regenerate HCs via both proliferation and direct transdifferentiation. In adult mammals, limited transdifferentiation from unidentified progenitors occurs to regenerate extrastriolar Type II HCs. Here, we show that HC damage in neonatal mouse utricle activates the Wnt target gene Lgr5 in striolar supporting cells. Lineage tracing and time-lapse microscopy reveal that Lgr5+ cells transdifferentiate into HC-like cells in vitro. In contrast to adults, HC ablation in neonatal utricles in vivo recruits Lgr5+ cells to regenerate striolar HCs through mitotic and transdifferentiation pathways. Both Type I and II HCs are regenerated, and regenerated HCs display stereocilia and synapses. Lastly, stabilized β-catenin in Lgr5+ cells enhances mitotic activity and HC regeneration. Thus Lgr5 marks Wnt-regulated, damage-activated HC progenitors and may help uncover factors driving mammalian HC regeneration.
DOI: 10.1016/s0378-5955(99)00137-9
发表时间: 1999-11-01
期刊: HEARING RESEARCH
影响因子: 2.8
作者:
Freeman, S;Plotnik, M;Sohmer, H
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发表时间: 2013-02-14
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期刊: The Journal of neuroscience : the official journal of the Society for Neuroscience
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发表时间: 2003-01-01
期刊: GENESIS
影响因子: 1.5
作者:
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通讯作者: Popko, B
DOI: 10.1016/s0378-5955(99)00046-5
发表时间: 1999-07-01
期刊: HEARING RESEARCH
影响因子: 2.8
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通讯作者: Dickman, JD