瘤抑制剂TMEM127的损失通过破坏膜动态驱动RET介导的转化
Timothy J Walker1, Eduardo Reyes-Alvarez1, Brandy D Hyndman1
1Division of Cancer Biology and Genetics, Cancer Research Institute, and Department of Pathology and Molecular Medicine, Queen's University, Kingston, Canada.
eLife
|April 30, 2024
概括
丢失TMEM127会导致受体氨酸激酶 (RTK) 在细胞表面积累,从而推动染细胞 (PCC) 细胞的增殖. 这表明TMEM127对于调节细胞表面蛋白贩运和防止癌症信号传递至关重要.
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:
- 受体氨酸激酶 (RTK) 调节细胞信号,它们的失调在癌症中很常见.
- 叶红细胞瘤 (PCC) 可能是由于RET突变或瘤抑制剂TMEM127.7的丧失引起的.
- 异常受体贩运在PCC病变发生中的确切作用尚不清楚.
研究的目的:
- 调查TMEM127在调节受体氨酸激酶 (RTK) 贩运和信号传递在染细胞瘤 (PCC) 中的作用.
- 阐明TMEM127损失对PCC中的瘤发生有助的机制.
主要方法:
- 研究了TMEM127损失对野生型RET蛋白局部化和活性的影响.
- 分析了细胞膜组织,克拉斯林涂层坑动力学和蛋白质内部化.
- 评估了TMEM127耗尽对各种跨膜蛋白的影响.
主要成果:
- 丧失TMEM127会导致野生型RET在细胞表面积累,促进构成性活动和下游信号传递.
- 缺少TMEM127会损害细胞膜组织,克拉思林涂层坑成熟以及受体内化/降解.
- TMEM127的耗尽导致多个跨膜蛋白质的表面积累,这表明对蛋白质贩运的影响更广泛.
结论:
- TMEM127对于维持正常的膜组织,蛋白质复合体组合和控制跨膜蛋白的表面水平至关重要.
- 由于TMEM127损失而改变的膜动力学促进细胞表面积累和生长因子受体的构成活性,驱动PCC瘤发生.
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
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
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
The Tumor Microenvironment
6.6K
Every normal cell or tissue is embedded in a complex local environment called stroma, consisting of different cell types, a basal membrane, and blood vessels. As normal cells mutate and develop into cancer cells, their local environment also changes to allow cancer progression. The tumor microenvironment (TME) consists of a complex cellular matrix of stromal cells and the developing tumor. The cross-talk between cancer cells and surrounding stromal cells is critical to disrupt normal tissue...
6.6K
Replicative Cell Senescence
3.6K
Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds...
3.6K


