Wnt Regulates Proliferation and Neurogenic Potential of Müller Glial Cells via a Lin28/let-7 miRNA-Dependent Pathway in Adult Mammalian Retinas.

Wnt Regulates Proliferation and Neurogenic Potential of Müller Glial Cells via a Lin28/let-7 miRNA-Dependent Pathway in Adult Mammalian Retinas.
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DOI:
10.1016/j.celrep.2016.08.078
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发表时间:
2016-09-27
期刊:
影响因子:
8.8
通讯作者:
Chen B
Chen B
中科院分区:
生物学1区
文献类型:
--
作者:
Yao K;Qiu S;Tian L;Snider WD;Flannery JG;Schaffer DV;Chen B

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在冷血脊椎动物(如斑马鱼)中,Müller胶质细胞(MG)很容易增殖以补充失去的视网膜神经元。然而,在哺乳动物中,MG缺乏再生能力,因为它们不会自发地重新进入细胞周期,除非视网膜受损。在这里,我们表明,在成年小鼠视网膜中的β-连环蛋白的基因转移激活Wnt信号传导和MG增殖而没有视网膜损伤。在Wnt上游,GSK 3 β的缺失稳定β-连环蛋白并激活MG增殖。在Wnt的下游,β-连环蛋白与Lin 28启动子结合并激活转录。Lin 28的缺失消除了β-连环蛋白介导的对MG增殖的作用,并且Lin 28基因转移刺激MG增殖。我们进一步证明let-7 miRNAs与Wnt/Lin 28调控的MG增殖密切相关。有趣的是,细胞周期再活化MG的一个子集表达无长突细胞的标志物。总之,这些结果揭示了Wnt-Lin 28-let 7 miRNA信号传导在调节成年哺乳动物视网膜中MG的增殖和神经发生潜力中的关键作用。Müller胶质细胞(MG)是视网膜干细胞的来源。为了克服MG在成年哺乳动物视网膜中的增殖静止,Yao等人报道了Wnt/Lin 28/let-7 miRNA信号传导的调节刺激MG增殖而没有视网膜损伤。细胞周期再活化MG的子集表达视网膜中间神经元的标记物。
In cold-blooded vertebrates such as zebrafish, Müller glial cells (MGs) readily proliferate to replenish lost retinal neurons. In mammals, however, MGs lack regenerative capability as they do not spontaneously re-enter the cell cycle unless the retina is injured. Here, we show that gene transfer of β-catenin in adult mouse retina activates Wnt signaling and MG proliferation without retinal injury. Upstream of Wnt, deletion of GSK3β stabilizes β-catenin and activates MG proliferation. Downstream of Wnt, β-catenin binds to the Lin28 promoter and activates transcription. Deletion of Lin28 abolishes β-catenin-mediated effects on MG proliferation, and Lin28 gene transfer stimulates MG proliferation. We further demonstrate that let-7 miRNAs are critically involved in Wnt/Lin28-regulated MG proliferation. Intriguingly, a subset of cell cycle reactivated MGs express markers for amacrine cells. Together, these results reveal a key role of Wnt-Lin28-let7 miRNA signaling in regulating proliferation and neurogenic potential of MGs in adult mammalian retina. Müller glial cells (MGs) are a source of retinal stem cells. To overcome proliferation quiescence of MGs in adult mammalian retina, Yao et al. report that modulation of Wnt/Lin28/let-7 miRNA signaling stimulates MG proliferation without retinal injury. A subset of cell cycle reactivated MGs express markers for retinal interneurons.
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