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
中科院分区:
文献类型:
--
作者:
Yao K;Qiu S;Tian L;Snider WD;Flannery JG;Schaffer DV;Chen B
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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影响因子:
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DOI:
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