由p53瘤抑制剂的功能障碍引起的瘤进展的动素依赖机制
相关实验视频
Updated: Jun 29, 2025

14:57
Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
9.5K
Natalia Khromova1, Maria Vasileva1, Vera Dugina1,2,3
1Carcinogenesis Institute, N.N. Blokhin National Medical Research Oncology Center, The Ministry of Health of Russia, 115478 Moscow, Russia.
Cancers
|March 28, 2024
概括
通过改变actin细胞骨架动态,增加细胞迁移和入侵,p53功能障碍促进癌症的攻击性. 恢复野生型TP53抑制了这些恶性行为,提供了新的治疗见解.
科学领域:
- 在瘤学瘤学.
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 癌细胞的攻击性对于转移至关重要,涉及到actin细胞骨架的重组.
- p53是癌细胞侵入性和迁移的关键调节者.
- 有利于g-actin的不平衡与癌细胞运动率的增加有关.
研究的目的:
- 研究p53功能障碍在调节癌细胞攻击性和转移中的作用.
- 探索p53状态,actin细胞骨架动力学和细胞运动性之间的关联.
- 阐明潜在的信号通路,包括ERK1/2,参与p53介导的癌症进展调节.
主要方法:
- 使用了人类肺腺癌A549细胞和p53缺乏的非小细胞肺癌H1299细胞.
- 通过无活化 (突变,抑制) 和野生型TP53过度表达来操纵p53状态.
- 评估细胞迁移,入侵和细胞增殖在体外和体内 (无细胞小鼠异种移植模型).
- 分析了actin细胞骨架组成 (γ-actin) 和ERK1/2信号通路的激活.
主要成果:
- 由于p53的失活,A549细胞的迁移,入侵和增殖显著增强,从而促进转移.
- 野生型TP53在H1299细胞中的过度表达减少了增殖和迁移,抑制了瘤性和转移.
- 这些细胞变化与活性蛋白细胞骨架重组相关,有利于γ-活性蛋白和ERK1/2信号激活.
结论:
- p53功能障碍是癌细胞攻击性的关键驱动因素,它促进了actin细胞骨架的重组和增加了运动性.
- 这些发现揭示了一种新的调节机制,涉及p53,γ-actin和ERK1/2信号在瘤进展中的作用.
- 向p53和相关途径可能为打击癌症转移提供新的策略.
相关概念视频
Abnormal Proliferation
4.5K
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...
4.5K
DNA Damage can Stall the Cell Cycle
9.1K
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...
9.1K
Loss of Tumor Suppressor Gene Functions
4.8K
Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
4.8K
Interactions Between Signaling Pathways
6.3K
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...
6.3K
mTOR Signaling and Cancer Progression
3.8K
The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
The mTOR pathway or the...
3.8K
Cancer-Critical Genes II: Tumor Suppressor Genes
7.4K
Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
7.4K

