抑制UPF1甲基化通过减少无意中介的mRNA衰变来增强瘤免疫治疗的敏感性
Shengyu Zhu1, Yucong Bai1, Dongjing Zhang1
1GI Cancer Research Institute, Tongji Hospital, Huazhong University of Science and Technology, Wuhan 430030, Hubei Province, China.
Cell reports
|June 26, 2025
概括
抑制UPF1甲基化通过削弱无意义介导的mRNA衰变 (NMD) 来增强结直肠癌 (CRC) 免疫性和抗PD-1治疗反应. 这为CRC免疫疗法提供了新的治疗点.
科学领域:
- 分子生物学分子生物学
- 癌症研究 癌症研究
- 免疫学 免疫学 免疫学
背景情况:
- 无意中介的mRNA衰变 (NMD) 是一个关键的RNA监测途径.
- 抑制NMD可以增加瘤新抗原的表达,增强免疫性.
- 在微卫星稳定 (MSS) 和微卫星不稳定 (MSI) 大肠直肠癌 (CRC) 之间存在UPF1蛋白水平的差异.
研究的目的:
- 研究UPF1蛋白水平在CRC免疫性和抗PD-1治疗反应中的作用.
- 阐明UPF1影响NMD和瘤免疫力的机制.
- 探索UPF1甲基化作为CRC免疫疗法的治疗标.
主要方法:
- 在临床CRC样本 (MSS和MSI) 中分析UPF1蛋白水平.
- 在CRC小鼠模型中评估UPF1对瘤免疫性和抗PD-1敏感性的影响.
- 通过蛋白质氨酸甲基转移酶4对UPF1 R433甲基化的研究及其对UPF1降解和NMD活性的影响.
主要成果:
- 在CRC中,UPF1蛋白水平与瘤免疫性和抗PD-1治疗敏感性有负相关性.
- 通过PRMT4对UPF1 R433的不对称二甲基化抑制了UPF1自降解.
- 抑制UPF1 R433甲基化减弱了NMD,在MSS和MSI模型中增加了CRC免疫性和抗PD-1敏感性.
结论:
- UPF1蛋白水平是CRC免疫性和对抗PD-1治疗的反应的关键调节者.
- 准UPF1 R433甲基化是一个有希望的策略,以提高CRC免疫疗法的疗效.
- 这项研究为扩大结直肠癌免疫疗法益处提供了一条新的治疗途径.
相关概念视频
Nonsense-mediated mRNA Decay
10.9K
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
10.9K
Abnormal Proliferation
4.6K
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...
4.6K
MicroRNAs
3.1K
MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
3.1K
Epigenetic Regulation
3.1K
Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
X-chromosome...
3.1K
Loss of Tumor Suppressor Gene Functions
5.1K
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...
5.1K
Experimental RNAi
6.3K
RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
6.3K


