用于人类肌肉型烟碱型乙酰胆碱受体 α1β1δε 的重组细胞模型系统。
Recombinant cellular model system for human muscle-type nicotinic acetylcholine receptor α1β1δε.
机构信息
Bundeswehr Institute of Pharmacology and Toxicology, Munich, Germany.
出版信息
Cell Stress Chaperones. 2023 Nov;28(6):1013-1025. doi: 10.1007/s12192-023-01395-0. Epub 2023 Nov 25.
The human muscle-type nicotinic acetylcholine receptor α1β1δε (nAChR) is a complex transmembrane receptor needed for drug screening for disorders like congenital myasthenic syndromes and multiple pterygium syndrome. Until today, most models are still using the nAChR from Torpedo californica electric ray. A simple reproducible cellular system expressing functional human muscle-type nAChR is still missing. This study addressed this issue and further tested the hypothesis that different chaperones, both biological and chemical, and posttranslational modification supporting substances as well as hypothermic incubation are able to increase the nAChR yield. Therefore, Gibson cloning was used to generate transfer plasmids carrying the sequence of nAChR or chosen biological chaperones to support the nAChR folding in the cellular host. Viral transduction was used for stable integration of these transgenes in Chinese hamster ovary cells (CHO). Proteins were detected with Western blot, in-cell and on-cell Western, and the function of the receptor with voltage clamp analysis. We show that the internalization of nAChR into plasma membranes was sufficient for detection and function. Additional transgenic overexpression of biological chaperones did result in a reduced nAChR expression. Chemical chaperones, posttranslational modification supporting substances, and hypothermic conditions are well-suited supporting applications to increase the protein levels of different subunits. This study presents a stable and functional cell line that expresses human muscle-type nAChR and yields can be further increased using the chemical chaperone nicotine without affecting cell viability. The simplified access to this model system should enable numerous applications beyond drug development. Graphical abstract created with http://biorender.com.
人类肌肉型烟碱型乙酰胆碱受体 α1β1δε(nAChR)是一种复杂的跨膜受体,对于先天性肌无力综合征和多发性翼状胬肉综合征等疾病的药物筛选非常重要。直到今天,大多数模型仍在使用加利福尼亚湾电鳐的 nAChR。仍然缺乏简单可重复的表达功能性人类肌肉型 nAChR 的细胞系统。本研究解决了这个问题,并进一步测试了以下假设:不同的伴侣蛋白,包括生物和化学伴侣蛋白,以及翻译后修饰支持物质,以及低温孵育,能够增加 nAChR 的产量。因此,使用 Gibson 克隆生成携带 nAChR 序列或选定的生物伴侣蛋白的转移质粒,以支持细胞宿主中 nAChR 的折叠。使用病毒转导将这些转基因稳定整合到中国仓鼠卵巢细胞(CHO)中。使用 Western blot、细胞内和细胞上 Western blot 检测蛋白质,并用电压钳分析检测受体的功能。我们表明,nAChR 内化到质膜中足以进行检测和功能。额外的转基因过表达生物伴侣蛋白确实导致 nAChR 表达减少。化学伴侣蛋白、翻译后修饰支持物质和低温条件非常适合提高不同亚基的蛋白质水平。本研究提供了一种稳定且功能性的细胞系,表达人类肌肉型 nAChR,并且可以使用化学伴侣尼古丁进一步增加产量,而不会影响细胞活力。这种简化的模型系统的获取应该能够在药物开发之外的众多应用中发挥作用。图形摘要由 http://biorender.com 创建。