HB-EGF is necessary and sufficient for Müller glia dedifferentiation and retina regeneration.

HB-EGF is necessary and sufficient for Müller glia dedifferentiation and retina regeneration.
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DOI:
10.1016/j.devcel.2011.11.020
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发表时间:
2012-02-14
期刊:
影响因子:
11.8
通讯作者:
Goldman, Daniel
Goldman, Daniel
中科院分区:
生物学1区
文献类型:
--
作者:
Wan, Jin;Ramachandran, Rajesh;Goldman, Daniel

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Müller胶质细胞(MG)去分化为多能祖细胞的循环群体对斑马鱼视网膜再生至关重要。MG去分化的机制尚不清楚。在这里,我们报告说,肝素结合表皮样生长因子(HB-EGF)是迅速诱导MG居住在损伤部位和proHB-EGF胞外域脱落是必要的视网膜再生。值得注意的是,HB-EGF刺激未损伤视网膜中多能MG衍生祖细胞的形成。我们发现HB-EGF通过EGFR/MAPK信号转导级联调节再生相关基因(如ascl 1a和pax 6 b)的表达来介导其作用。我们还发现了一个HB-EGF/Ascl 1a/Notch/hb-egfa信号环,有助于定义损伤反应性MG的区域。最后,我们发现HB-EGF作用于Wnt/β-catenin信号级联的上游,该级联控制祖细胞增殖。这些数据提供了细胞外信号和再生相关的基因表达在受损的视网膜之间的联系,并提出了刺激哺乳动物视网膜再生的策略。
Müller glia (MG) dedifferentiation into a cycling population of multipotent progenitors is crucial to zebrafish retina regeneration. The mechanisms underlying MG dedifferentiation are unknown. Here we report that heparin-binding epidermal-like growth factor (HB-EGF) is rapidly induced in MG residing at the injury site and that proHB-EGF ectodomain shedding is necessary for retina regeneration. Remarkably, HB-EGF stimulates the formation of multipotent MG-derived progenitors in the uninjured retina. We show that HB-EGF mediates its effects via an EGFR/MAPK signal transduction cascade that regulates the expression of regeneration-associated genes, like ascl1a and pax6b. We also uncover an HB-EGF/Ascl1a/Notch/hb-egfa signaling loop that helps define the zone of injury-responsive MG. Finally, we show that HB-EGF acts upstream of the Wnt/β-catenin signaling cascade that controls progenitor proliferation. These data provide a link between extracellular signaling and regeneration-associated gene expression in the injured retina and suggest strategies for stimulating retina regeneration in mammals.
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