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在培养的老鼠寡腺细胞前体细胞中缺乏复制性衰老
D G Tang1, Y M Tokumoto, J A Apperly
1MRC Laboratory for Molecular Cell Biology, University College London, London WC1E 6BT, UK.
概括
大多数哺乳动物细胞停止分裂,这种状态称为复制性细胞衰老. 然而,如果避免分化和细胞周期检查点,基基细胞前体细胞可以无限期繁殖.
科学领域:
- 细胞生物学 细胞生物学
- 神经科学是一个神经科学.
- 发展生物学 发展生物学
背景情况:
- 体细胞通常表现出有限的增殖,在有限数量的分裂后进入复制性细胞衰老.
- 细胞衰老是细胞循环停止的永久状态.
- 了解调节细胞增殖和衰老的因素对于发育和衰老研究至关重要.
研究的目的:
- 为了研究寡头细胞前体细胞 (OPC) 的增殖能力.
- 为了确定OPC是否在特定培养条件下受到复制性衰老的影响.
- 探索分化和细胞周期检查点在调节OPC增殖中的作用.
主要方法:
- 从产后大鼠视神经中净化小基细胞前体细胞.
- 在无血清条件下培养OPC,防止分化.
- 对细胞分裂,端粒酶活性和细胞循环抑制蛋白质的分析.
- 使用血清或基因毒药物诱导类似衰老的表型.
主要成果:
- 大多数OPC可以在文化中无限期繁殖,只要防止分化.
- 这些增殖OPC保持高端粒酶活性.
- 细胞周期检查点 (p53和Rb依赖) 保持功能,可以激活以诱导类似衰老的表型.
- 差异化线索或基因毒性压力会触发一种类似衰老的状态.
结论:
- 正常的动物前体细胞,特别是OPCs,具有无限的繁殖潜力.
- 避免细胞周期检查点的分化和激活是维持OPC增殖的关键.
- 这一发现挑战了复制性衰老对所有哺乳动物体细胞,特别是前体细胞种群的普遍适用性.
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