瘤基因诱导的衰老路径编织了一个复杂的挂毯
1Life Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd., Berkeley, CA 94720, USA. p_yaswen@lbl.gov
Cell
|January 27, 2007
概括
激活的瘤基因触发细胞衰老,防止癌症. 研究人员确定了p38调节/激活蛋白激酶 (PRAK) 作为一个关键的衰老诱导剂,激活瘤抑制剂p53,阻断小鼠皮肤癌的进展.
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:
- 激活的瘤基因可以诱导细胞衰老,这种状态作为细胞转化和瘤发展的关键障碍.
- 了解调解瘤基因诱导衰老的分子通路对于癌症预防策略至关重要.
研究的目的:
- 为了确定衰老途径中的一个关键组成部分,有效地防止瘤发生.
- 阐明p38调节/激活蛋白激酶 (PRAK) 在瘤基因诱导的衰老和瘤抑制中的作用.
主要方法:
- 利用皮肤癌的小鼠模型.
- 研究了PRAK在诱导衰老的功能,该功能是瘤性Ras.
- 通过PRAK.检查了p53的直接酸化和激活.
主要成果:
- PRAK被确定为瘤性Ras.下游衰老的关键调解者.
- PRAK直接酸化并激活瘤抑制蛋白p53.
- 在皮肤癌模型中,这种PRAK-p53轴在瘤性Ras激活的背景下有效地防止瘤发生.
结论:
- 通过诱导衰老,PRAK在预防癌症方面发挥着重要作用.
- PRAK对p53的直接激活是这种衰老途径抑制瘤形成的关键机制.
- 准PRAK-p53通路可能为皮肤癌提供新的治疗策略.
相关概念视频
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01:05Cancer-Critical Genes II: Tumor Suppressor Genes
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.
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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...
02:07Tumor Progression
Tumor progression is a phenomenon where the pre-formed tumor acquires successive mutations to become clinically more aggressive and malignant. In the 1950s, Foulds first described the stepwise progression of cancer cells through successive stages.
Colon cancer is one of the best-documented examples of tumor progression. Early mutation in the APC gene in colon cells causes a small growth on the colon wall called a polyp. With time, this polyp grows into a benign, pre-cancerous tumor. Further...
Colon cancer is one of the best-documented examples of tumor progression. Early mutation in the APC gene in colon cells causes a small growth on the colon wall called a polyp. With time, this polyp grows into a benign, pre-cancerous tumor. Further...
01:05Cancer-Critical Genes II: Tumor Suppressor Genes
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...
01:12Loss of Tumor Suppressor Gene Functions
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...