通过降低eIF5A活性来抑制翻译延长会诱导启动的反抑制,限制瘤细胞增殖
Aristeidis P Sfakianos1, Rebecca M Raven2, Tom Smith2
1MRC Toxicology Unit, University of Cambridge, Cambridge, UK. arissfak92@gmail.com.
Nature communications
|December 13, 2025
概括
使用GC7准5A真核启动因子 (eIF5A),通过减少蛋白质合成来抑制癌细胞生长. 这种抑制会触发压力反应,影响线粒体功能,最终减少癌症的扩散.
科学领域:
- 分子生物学分子生物学
- 癌症研究 癌症研究
- 生物化学 生化学
背景情况:
- 癌症的发展涉及转化体失调,异常的mRNA延长和真核细胞启动因子5A (eIF5A) 表达有助于瘤生长.
- 向转化因子为瘤提供了潜在的治疗策略.
研究的目的:
- 调查针对eIF5A与抑制剂GC7作为抑制异常癌细胞生长的策略的有效性.
- 阐明eIF5A抑制影响蛋白质合成和癌细胞增殖的分子机制.
主要方法:
- 利用eIF5A抑制剂GC7研究其对癌细胞生长的影响.
- 采用动态SILAC (细胞培养中的氨基酸稳定同位素标记) 来识别受减少eIF5A活性影响的蛋白质.
- 研究了综合应激反应 (ISR) 和线粒体功能的作用,以调解GC7的影响.
主要成果:
- 用GC7抑制eIF5A活动,通过eIF2α酸化诱导反抑制翻译启动,导致蛋白质合成减少.
- 减少eIF5A活动会损害线粒体功能,激活HRI向eIF2α酸化信号,从而减少癌细胞的增殖.
- 观察到的GC7对癌细胞增殖的影响被集成的应激反应抑制剂逆转,表明通过翻译启动进行调解.
结论:
- 通过GC7抑制eIF5A,通过破坏蛋白质合成和线粒体功能,有效地减少异常癌细胞的生长.
- GC7的抗癌作用主要通过综合应激反应和翻译启动的反抑制进行介导.
- 向eIF5A代表了对癌症的潜在治疗策略,这些癌症依赖于线粒体功能来扩散和生存.
相关概念视频
mTOR Signaling and Cancer Progression
4.6K
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...
4.6K
Initiation of Translation
38.2K
Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
38.2K
Abnormal Proliferation
5.1K
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...
5.1K
Eukaryotic Transcription Inhibitors
10.9K
Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
Eukaryotic transcription inhibitors usually contain two distinct domains, a...
Eukaryotic transcription inhibitors usually contain two distinct domains, a...
10.9K
Negative Regulator Molecules
38.2K
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.
38.2K
Inhibition of Cdk Activity
5.5K
The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
5.5K


