对EIF2AK3变异的基因内置检测揭示了小鼠肝脏和胰腺中PERK活性的差异,而PERK活性的差异是在内质网膜应激状态下
相关实验视频
Updated: Jun 10, 2025

10:36
Measurements of Physiological Stress Responses in C. Elegans
Published on: May 21, 2020
13.9K
Shivesh Ghura1, Noah R Beratan1, Xinglong Shi1
1Department of Oral Medicine, School of Dental Medicine, University of Pennsylvania, 240 S. 40th St, Rm 312 Levy, Philadelphia, PA, 19104, USA.
Scientific reports
|October 11, 2024
概括
在EIF2AK3基因中常见的单核酸变体 (SNVs),形成PERK-B单核型,微妙地增强PERK蛋白激酶活性. 这一发现提供了有关ER压力相关疾病和疾病易感性的见解.
科学领域:
- 遗传学 遗传学 是一个
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 细胞转化启动因子2α激酶3 (EIF2AK3) 编码PERK,这是内细胞网膜 (ER) 应激的一个关键调节器.
- 在EIF2AK3中常见的单核酸变体 (SNV),称为PERK-B单核型,在全球28%的人口中发现.
- PERK-B SNVs对PERK活动和疾病风险的功能影响在很大程度上是未知的.
研究的目的:
- 研究PERK-B SNVs对PERK活动和细胞应对ER压力的精确影响.
- 描述PERK-B单元型的体外和体内效应.
- 建立一个新的PERK-B小鼠模型来研究ER与压力相关的疾病.
主要方法:
- 在体外激酶试验中比较PERK-A和PERK-B活性.
- 产生和分析表达PERK-B SNVs的三重敲进小鼠.
- 在ER压力条件下评估PERK活动,细胞亡和各种组织 (肝脏,胰腺,巨细胞) 的细胞反应.
主要成果:
- 在实验室或实验小鼠中,PERK-B SNVs没有改变PERK表达或基底活性.
- 在无细胞试验和小鼠肝脏同质试验中,PERK-B蛋白比PERK-A具有更高的激酶活性.
- 在急性ER压力下,PERK-B/B小鼠表现出胰腺对亡的敏感性增加以及巨细胞中PERK活性升高.
结论:
- PERK-B 单元型增强了 PERK 激酶的活性,特别是在压力条件下.
- 这些发现表明PERK活动有助于ER与压力相关疾病的疾病易感性.
- PERK-B小鼠模型为了解ER压力机制和遗传疾病联系提供了有价值的工具.
相关概念视频
Regulation of the Unfolded Protein Response
2.4K
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
2.4K
The Unfolded Protein Response
4.4K
The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...
4.4K
PI3K/mTOR/AKT Signaling Pathway
3.4K
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a...
3.4K

