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回复 Damon-Salvatore 的帖子
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6 L( ^! C* y, l2 Q伦敦大学眼科研究院的Robin Ali博士研究组之前研究发现通过移植健康小鼠的光感受器杆细胞能够恢复盲鼠的视觉能力。在本研究中他们采用日本科学家开发的最新技术将干细胞特异的分化为光感受器来治疗视网膜疾病。, n% E& {! }* K: b
Ali博士称,近几年来科学家在干细胞定向分化领域进步很多,但是像视网膜这样的复杂结构很很难在实验室中复制出来。部分原因可能是由于在细胞培养水平不能重现正常胚胎发育过程。" M$ A$ h6 Y5 x
Ali博士实验室接下来打算在人类细胞中使用该技术,希望尽早能进行临床实验,为患者造福。(生物谷Bioon.com), F" q* z8 O4 ]9 X( D& t
+ B% p7 ]. W$ z4 ^( R5 _doi:10.1038/nbt.2643
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Photoreceptor precursors derived from three-dimensional embryonic stem cell cultures integrate and mature within adult degenerate retina
$ \7 h) V0 m, o* x( h) _- }/ kAnai Gonzalez-Cordero, Emma L West, Rachael A Pearson, Yanai Duran, Livia S Carvalho, Colin J Chu, Arifa Naeem, Samuel J I Blackford, Anastasios Georgiadis, Jorn Lakowski, Mike Hubank, Alexander J Smith, James W B Bainbridge, Jane C Sowden & Robin R Ali
3 w7 i6 Q( G1 R" r8 q# D( PIrreversible blindness caused by loss of photoreceptors may be amenable to cell therapy. We previously demonstrated retinal repair1 and restoration of vision through transplantation of photoreceptor precursors obtained from postnatal retinas into visually impaired adult mice2, 3. Considerable progress has been made in differentiating embryonic stem cells (ESCs) in vitro toward photoreceptor lineages4, 5, 6. However, the capability of ESC-derived photoreceptors to integrate after transplantation has not been demonstrated unequivocally. Here, to isolate photoreceptor precursors fit for transplantation, we adapted a recently reported three-dimensional (3D) differentiation protocol that generates neuroretina from mouse ESCs6. We show that rod precursors derived by this protocol and selected via a GFP reporter under the control of a Rhodopsin promoter integrate within degenerate retinas of adult mice and mature into outer segment–bearing photoreceptors. Notably, ESC-derived precursors at a developmental stage similar to postnatal days 4–8 integrate more efficiently compared with cells at other stages. This study shows conclusively that ESCs can provide a source of photoreceptors for retinal cell transplantation. |
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