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Inverted light microscope

Company: Olympus
Catalog#: IX53
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Multiplex T-cell Stimulation Assay Utilizing a T-cell Activation Reporter-based Detection System
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

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[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; ...

HCV Reporter System (Viral Infection-Activated Split-Intein-Mediated Reporter System) for Testing Virus Cell-to-cell Transmission ex-vivo
Author:
Date:
2018-08-05
[Abstract]  Hepatitis C virus (HCV) spread involves two distinct entry pathways: cell-free transmission and cell-to-cell transmission. Cell-to-cell transmission is not only an efficient way for viruses to spread but also an effective method for escaping neutralizing antibodies. We adapted the viral infection-activated split-intein-mediated reporter system (VISI) and developed a straightforward model for Live-cell monitoring of HCV cell-to-cell transmission ex-vivo: co-culture of HCV infected donor cells (red signal) with uninfected recipient cells (green signal) and elimination of the cell-free transmission by adding potent neutralizing antibody AR3A in the supernatant. With this model, the efficiency of cell-to-cell transmission can be evaluated by counting the number of foci designated by ... [摘要]  丙型肝炎病毒(HCV)传播涉及两种不同的进入途径:无细胞传播和细胞间传播。 细胞间传播不仅是病毒传播的有效方式,也是逃避中和抗体的有效方法。 我们采用了病毒感染激活的分裂 - 内含肽介导的报告系统(VISI),并开发了一种直接模型,用于活细胞监测HCV细胞间传递离体:共培养 HCV感染的供体细胞(红色信号)与未感染的受体细胞(绿色信号)和通过在上清液中加入有效的中和抗体AR3A消除无细胞的传递。 利用该模型,可以通过计数受体细胞的绿色信号指定的病灶数来评估细胞间传递的效率。

【背景】越来越多的证据证明病毒可以在受感染的组织中使用不同的传播途径(Sattentau,2008; Zhong et al。,2013)。对于HCV传播,无细胞传播和细胞间传播均可介导肝细胞之间的病毒转移。虽然无细胞传播引发HCV感染,但认为细胞 - 细胞传递直接将HCV转移至相邻的肝细胞。它提供了抵抗中和抗体并有助于病毒持久性的极好方法(Brimacombe et al。,2011; Xiao et al。,2014)。之前的文章也证明了一些促进细胞传递的宿主因子,如清道夫受体BI(SR-BI),CD81,紧密连接蛋白claudin-1(CLDN1),Occludin(OCLN),表皮生长因子受体(EGFR)。 (Witteveldt et al。,2009; ...

A Lentiviral Pseudotype ELLA for the Measurement of Antibodies Against Influenza Neuraminidase
Author:
Date:
2018-07-20
[Abstract]  This protocol describes the rapid and safe production of lentiviral pseudotypes characterized by a lentiviral core containing a reporter, in conjunction with avian influenza haemagglutinin (HA) and human neuraminidase (NA) glycoproteins on the surface. Production is optimized with Endofectin LentiTM transfection reagent in 6-well plate format. These pseudotyped viruses can be employed for serological assays of surface glycoproteins HA and NA. They can be efficiently used to perform the ELLA (Enzyme-linked lectin assay) to measure NA inhibiting antibodies in lieu of using reassortant virus or Triton X-100 inactivated wild-type virus as source of antigen, which may require higher biosafety levels. [摘要]  该方案描述了慢病毒假型的快速和安全生产,其特征在于含有报道分子的慢病毒核心,以及表面上的禽流感血凝素(HA)和人神经氨酸酶(NA)糖蛋白。 使用6孔板形式的Endofectin Lenti TM 转染试剂优化生产。 这些假型病毒可用于表面糖蛋白HA和NA的血清学测定。 它们可以有效地用于进行ELLA(酶联凝集素测定)以测量NA抑制抗体,而不是使用重配病毒或Triton X-100灭活的野生型病毒作为抗原来源,这可能需要更高的生物安全水平。

【背景】流感病毒假型的产生先前已被广泛描述(Nefkens et al。,2007; Temperton et al。,2007; Carnell et al。,2015)。需要一种安全快速的系统来评估通过ELLA测定靶向NA的抗体,避免使用重配错配病毒或野生型病毒,这已经通过产生携带NA型流感假型来满足(Prevato et al。,2015)。最近的一项研究(Biuso et al。,2017)证实HA与NA的共表达改善了新形成的假型慢病毒的释放。在这里,我们报告了一种简单,广泛适用和优化的PV生产方案,使用6孔板格式的Endofectin Lenti TM ...

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