相关实验视频
Updated: Jun 21, 2026
14:57
Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
将p53瘤抑制途径与体细胞重编程联系起来
Teruhisa Kawamura1, Jotaro Suzuki, Yunyuan V Wang
1Gene Expression Laboratory, Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, California 92037, USA.
Nature
|August 12, 2009
概括
科学家们发现,抑制p53通路显著提高了从体细胞中制造诱导多能干细胞 (iPS) 的效率. 这一发现提高了重编程方法,降低了癌症风险.
科学领域:
- 细胞生物学 细胞生物学
- 干细胞研究 干细胞研究
- 分子生物学分子生物学
背景情况:
- 诱导多能干细胞 (iPS) 生成对再生医学至关重要.
- 目前使用多能因子和瘤基因的重编程方法效率低,存在恶性转化风险.
- 在限制体细胞重编程效率方面,p53通路的作用尚未完全被理解.
研究的目的:
- 研究限制体细胞重编程效率的机制.
- 确定增强iPS细胞生成的策略,同时尽量减少瘤基因使用和恶性转变.
- 探索p53通路在重编程过程中的作用.
主要方法:
- 在重编程过程中调查了p53通路的激活.
- 通过表达突变的负调节器,删除/击败p53或p21或对抗亡来减少p53信号传递.
- 在小鼠和人类体细胞中评估了重编程效率.
主要成果:
- 重编程因素激活了p53通路,限制了效率.
- 减少p53信号显著提高了小鼠纤维细胞的重编程效率.
- 降低的p53水平只允许使用Oct4和Sox2的iPS细胞生成,产生生殖线传递的基因细胞小鼠.
- 抑制p53显著提高了人体体细胞重编程效率.
结论:
- p53通路是有效的体细胞重编程的关键障碍.
- 抑制p53信号提供了一种新的策略来提高iPS细胞生成效率.
- 这种方法为产生iPS细胞提供了更安全,更有效的方法,具有潜在的临床应用.
相关概念视频
01:29Somatic to iPS Cell Reprogramming
Reprogramming alters the gene expression in somatic cells, transforming them into induced pluripotent stem (iPS) cells over several generations. Scientists can reprogram cells by introducing genes for four transcription factors—Oct4, Sox2, Klf4, and c-Myc (OSKM) by viral or non-viral methods. These factors are also known as Yamanaka factors after Shinya Yamanaka, who first generated iPS cells using mouse skin cells. Yamanaka was awarded the Nobel Prize in Physiology or Medicine in 2012 for this...
02:23Abnormal Proliferation
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
01:24Methods of Nuclear Reprogramming
Nuclear reprogramming is a process of transforming one cell type into an unrelated cell type by epigenetic changes that alter the cell’s original gene expression pattern. Such epigenetic changes force cells to express a different set of genes, which play a significant role in inducing transformation into other cell types. Nuclear reprogramming offers applications in reproductive cloning for livestock propagation and regenerative medicine — developing patient-specific cells for injury repair.
02:36DNA Damage can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
02:36DNA Damage Can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
01:19Interactions Between Signaling Pathways
Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...