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胚胎视网膜细胞的可塑性和分化在终端线粒分裂后
1Wilmer Eye Institute, School of Medicine, Johns Hopkins University, Baltimore, MD 21205.
Science (New York, N.Y.)
|January 20, 1989
概括
胚胎视网膜细胞在细胞分裂后可以成为神经元或光受体. 光受体差异化是一个默认的途径,而神经元差异化需要特定的信号.
科学领域:
- 发育生物学是发展生物学.
- 神经科学是一个神经科学.
- 细胞生物学 细胞生物学
背景情况:
- 胚胎前体细胞在末端线粒分裂后的发育命运尚不清楚.
- 了解细胞命运决定对于发育生物学和再生医学至关重要.
研究的目的:
- 研究胚胎小视网膜前体细胞中终端线粒分裂和发育命运之间的关系.
- 为了确定视网膜前体细胞在不同条件下分化为神经元或光受体的潜力.
主要方法:
- 利用 [3H] 提米丁自射成像来精确确定细胞诞生的时间.
- 采用细胞培养系统,评估不同胚胎阶段隔离的视网膜前体细胞的发育潜力.
主要成果:
- 在体外,光受体分化在早期胚胎视网膜前体细胞中的神经元分化之前,与体内观察相反.
- 在第6个胚胎日 (ED-6) 隔离的细胞主要形成光受体,而在ED-8分离的细胞主要发展为神经元.
- 视网膜前体细胞在终端神经分裂后保持多能性,能够分化为任何一种细胞类型.
结论:
- 胚胎视网膜前体细胞在末端线粒分裂后具有神经元和光受体分化的能力.
- 光受体差异化似乎是一个默认的发展途径,在没有特定的神经元诱导信号的情况下.
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