相关实验视频
Updated: Jul 10, 2026

14:57
Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
p53:好警察/坏警察
Norman E Sharpless1, Ronald A DePinho
1Department of Adult Oncology, Dana-Farber Cancer Institute, Department of Medicine and Genetics, Harvard Medical School, Boston, MA 02115, USA.
Cell
|August 2, 2002
概括
通过阻止受损细胞生长,预防癌症至关重要的p53蛋白质也通过DNA损伤,端粒缩短和氧化应激导致衰老. 针对癌症和衰老的疗法必须绕过,而不是在p53.
科学领域:
- 分子生物学分子生物学
- 老年学是指老年学的学科.
- 细胞生物学 细胞生物学
背景情况:
- 细胞应激会激活p53转录因子,例如DNA损伤和瘤基因激活.
- p53启动基因表达,以防止受损细胞的增殖,这是一个关键的抗癌机制.
- 新出现的证据表明,p53激活可能会对生物体的平衡和衰老产生负面影响.
研究的目的:
- 讨论p53在抑制癌症和衰老中的双重作用.
- 探索p53在主要衰老理论中的参与:DNA损伤,端粒缩短和氧化应激.
- 将p53定位在癌症和衰老研究的交叉点上.
主要方法:
- 文献综述和理论讨论.
- 对细胞应激反应中的p53功能的现有研究进行分析.
- 综合数据将p53与衰老途径联系起来.
主要成果:
- 在人类衰老的三个关键理论中,p53起着重要作用.
- 这些理论包括与DNA损伤,端粒缩短和氧化应激有关的衰老机制.
- p53表现出"好警察/坏警察"功能,平衡癌症预防与促进衰老.
结论:
- p53在相反的力量:癌症和衰老的联系处处于关键位置.
- 对抗癌症和衰老的治疗策略必须针对p53的上游或下游的途径.
- 了解p53的双重作用对于开发长寿干预措施至关重要.
相关概念视频
Positive Regulator Molecules
To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.
Negative Regulator Molecules
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
DNA 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...
Positive Regulator Molecules
Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
Abnormal 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...
DNA 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...

