| Multiplex T-cell Stimulation Assay Utilizing a T-cell Activation Reporter-based Detection System
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Author:
Date:
2021-01-20
[Abstract] Immune tolerance and response are both largely driven by the interactions between the major histocompatibility complex (MHC) expressed by antigen presenting cells (APCs), T-cell receptors (TCRs) on T-cells, and their cognate antigens. Disordered interactions cause the pathogenesis of autoimmune diseases such as type 1 diabetes. Therefore, the identification of antigenic epitopes of autoreactive T-cells leads to important advances in therapeutics and biomarkers. Next-generation sequencing methods allow for the rapid identification of thousands of TCR clonotypes from single T-cells, and thus there is a need to determine cognate antigens for identified TCRs. This protocol describes a reporter system of T-cell activation where the fluorescent reporter protein ZsGreen-1 is driven by nuclear ...
[摘要] [摘要] 免疫耐受和应答都很大程度上由抗原呈递细胞(APC)表达的主要组织相容性复合物(MHC),T细胞上的T细胞受体(TCR)及其同源抗原之间的相互作用驱动。相互作用障碍导致自身免疫性疾病(例如1型糖尿病)的发病机理。因此,鉴定自身反应性T细胞的抗原表位导致治疗和生物标志物的重要进展。下一代测序方法可从单个T细胞快速鉴定数千种TCR克隆型,因此需要确定已鉴定TCR的同源抗原。该协议描述了T细胞活化的报告系统,其中荧光报告蛋白ZsGreen-1由活化T细胞的核因子(NFAT)信号驱动并通过流式细胞仪读取。记者T细胞也组成性表达额外的一对荧光素tein作为识别物,允许同时多路复用多达8种不同的报告T细胞系,每种表达不同的目标TCR,可通过流式细胞仪区分。一旦制成TCR表达细胞系,仅需一个转导步骤即可将其无限期用于制备新的T细胞系。这种多路复用系统允许筛选TCR-抗原相互作用的数量,否则这些相互作用将是不切实际的,可在多种情况下使用(即,筛选单个抗原或抗原库),并可用于研究任何T细胞-MHC-抗原三分子相互作用。
[背景] T细胞,抗原呈递细胞(APC)及其同源抗原之间的相互作用是自身免疫性疾病(例如1型糖尿病)的主要事件(Michels等,2017; ...
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| Dual Fluorescence Cytometry Assay to Assess Cellular Protein Levels
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Author:
Date:
2020-04-20
[Abstract] Expression levels of cellular proteins can be affected by various perturbations, such as genetic knockout of interactors, drug treatments or cell stress. To specifically measure the effects on protein levels post-synthesis under different experimental conditions, it is important to compensate for transcriptional and other upstream changes. Here, we provide a protocol for a dual-fluorescence flowcytometry-based assay to determine protein levels. The protein of interest is genetically linked to enhanced GFP (eGFP) followed by a viral 2A self-cleaving peptide sequence and mCherry. As a result, translation of the reporter construct leads to two fluorescent protein products from the same mRNA template, which enables unambiguous protein expression analysis with normalization across samples.
[摘要] [摘要 ] 表达水平的细胞蛋白质可受各种扰动,如基因敲除交互件,药物治疗小号或细胞压力。具体测量对蛋白质水平合成后在不同的实验条件,重要的是要补偿对于转录等上游的变化在这里,我们提供了一个协议为双- 荧光流。流式细胞仪为基础的检测,以确定蛋白质水平目的蛋白是遗传关联增强GFP(EGFP 其次是病毒2A自身切割肽)序列和mCherry结果,报告子构建体的翻译会导致来自同一mRNA模板的两个荧光蛋白产物,这使得能够进行明确的蛋白表达分析,并对整个样品进行归一化处理。
背景 ] 合成和维护的Cellu 拉尔在p- Roteins取决于多进程,从转录调节,处理和降解mRNA中翻译,折叠,本地化,翻译后修饰和蛋白质降解(沃格尔而且马科特,2012) 。具体研究的。在蛋白水平合成后的细胞扰动的影响,这一点很重要,以弥补变异上游步骤蛋白表达在这里,我们提供了一个协议的双- 荧光流术为基础的检测,以确定蛋白质水平处于稳定状态如前所述(Itakura 等人,2016; Chitwood 等人,2018; Ngo 等人,2019)。目的蛋白在基因上与增强的GFP(eGFP )融合,随后是病毒2A自切割肽序列和一个第二种荧光蛋白,mCherry (图1),由于在2A s时核糖体跳过了肽键,融合构建体的翻译产生了两种蛋白质产物,其比例为1:1。ite:与eGFP 和mCherry ...
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