胚胎干细胞自我更新的基本状态
Qi-Long Ying1, Jason Wray, Jennifer Nichols
1Center for Stem Cell and Regenerative Medicine, Department of Cell and Neurobiology, Keck School of Medicine, University of Southern California, 1501 San Pablo Street, ZNI 529, Los Angeles, California 90033, USA. qying@keck.usc.edu
Nature
|May 24, 2008
概括
胚胎干细胞自我更新不需要外部刺激. 消除特定的信号通路使ES细胞能够自我复制,揭示出一种天生的多能性程序.
科学领域:
- 干细胞生物学 干细胞生物学
- 发育生物学是发展生物学.
- 分子遗传学 分子遗传学
背景情况:
- 胚胎干细胞 (ES) 传统上需要复杂的介质和料细胞进行自我更新.
- 据认为,自我更新取决于多因素刺激,包括通过STAT3.3传递细胞因子信号.
- 精确的ES细胞自我更新的最低要求仍然不完全定义.
研究的目的:
- 确定外部刺激是否对ES细胞衍生,传播和多能性至关重要.
- 确定ES细胞自我更新的最小分子要求.
- 为了研究ES细胞的先天自我复制程序.
主要方法:
- 抑制基因激活蛋白激酶 (MAPK) 信号,以阻止分化.
- 抑制糖原合成酶激酶3 (GSK3) 以提高生物合成能力.
- 衍生和培养STAT3缺乏ES细胞,以确认细胞因子信号的绕行.
主要成果:
- 外在刺激,包括细胞因子,对于ES细胞的衍生和自我更新是不可或缺的.
- 消除MAPK信号足以实现自我更新.
- 对MAPK和GSK3的联合抑制抑制了残留分化并保持了多能性.
- 缺少STAT3的ES细胞保持自我更新,证实了细胞因子信号的可用性.
结论:
- ES细胞具有与生俱来的自我复制程序,独立于外部信号.
- 最小的培养条件可以维持ES细胞的自我更新和多能性.
- 了解这些最低要求为研究多能性提供了一个明确的平台,并可能解释ES细胞瘤性.
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