The role of microglia in the neurogenesis of zebrafish retina.

The role of microglia in the neurogenesis of zebrafish retina.
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DOI:
10.1016/j.bbrc.2012.03.139
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发表时间:
2012-05-04
影响因子:
3.1
通讯作者:
Li Y
Li Y
中科院分区:
生物学4区
文献类型:
--
作者:
Huang T;Cui J;Li L;Hitchcock PF;Li Y

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小胶质细胞是来自存在于中枢神经系统中的非神经元谱系的细胞。在斑马鱼中,早期巨噬细胞在受精后26-30小时(hpf)从卵黄囊迁移到大脑和视网膜,并在55-60 hpf转化为小胶质细胞。巨噬细胞迁移到中枢神经系统需要巨噬细胞集落刺激因子-1受体(csf-1 r)的信号,它由基因fms编码。在这项研究中,我们发现用吗啉寡核苷酸靶向敲除csf-1 r可以延迟巨噬细胞从卵黄囊向视网膜的迁移,这种巨噬细胞迁移的延迟会导致小眼球,视网膜祖细胞的细胞周期退出延迟以及神经元分化的缺失。当允许胚胎存活超过吗啉代依赖性翻译抑制丧失的时间时,小胶质细胞重新占据视网膜,神经元分化部分恢复。我们的数据表明,小胶质细胞是正常的视网膜生长和神经发生所必需的。这项研究为小胶质细胞在斑马鱼视网膜发育过程中的神经原性作用提供了新的见解。
Microglia are cells from non-neuronal lineages that reside in the central nervous system. In zebrafish, early macrophages migrate from the yolk sac to the brain and retina at 26–30 hours post fertilization (hpf) and transform into microglia at 55–60 hpf. The migration of macrophages into the central nervous system requires signaling by macrophage colony stimulating factor-1 receptor (csf-1r), which is encoded by the gene fms. In this study, we show that the targeted knockdown of csf-1r with morpholino oligonucleotides delays migration of macrophages from the yolk sac to the retina, and this delay in macrophage migration results in microphthalmia, delay in cell cycle withdrawal among retinal progenitors and the absence of neuronal differentiation. When embryos were allowed to survive beyond the time when morpholino-dependent translation inhibition is lost, microglia re-occupy the retina and neuronal differentiation partially recovers. Our data demonstrate that microglia are required for normal retinal growth and neurogenesis. This study provides new insight into the neurogenic role of microglia during retinal development in zebrafish.
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