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2,4-diamidino-2-phenylindole (DAPI)

Company: Thermo Fischer Scientific
Catalog#: D1306
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High-throughput Microscopic Analysis of Salmonella Invasion of Host Cells
Author:
Date:
2018-09-20
[Abstract]  Salmonella is a Gram-negative bacterium causing a gastro-enteric disease called salmonellosis. During the first phase of infection, Salmonella uses its flagella to swim near the surface of the epithelial cells and to target specific site of infection. In order to study the selection criteria that determine which host cells are targeted by the pathogen, and to analyze the relation between infecting Salmonella (i.e., cooperation or competition), we have established a high-throughput microscopic assay of HeLa cells sequentially infected with fluorescent bacteria. Using an automated pipeline of image analysis, we quantitatively characterized a multitude of parameters of infected and non-infected cells. Based on this, we established a predictive model that ... [摘要]  沙门氏菌是革兰氏阴性细菌,引起称为沙门氏菌病的胃肠疾病。在感染的第一阶段,沙门氏菌使用其鞭毛在上皮细胞表面附近游泳并靶向特定的感染部位。为了研究确定哪种宿主细胞被病原体靶向的选择标准,并分析感染沙门氏菌( ie ,合作或竞争)之间的关系,我们有建立了对荧光细菌依次感染的HeLa细胞的高通量显微镜检测。使用自动化图像分析管道,我们定量表征了感染和未感染细胞的众多参数。基于此,我们建立了一个预测模型,使我们能够识别宿主细胞易受感染的参数。我们发现宿主细胞易损性有两个来源:病原体诱导的细胞易感性从沙门氏菌摄取中出现并持续存在于感染过程的后期阶段;以及与细胞固有属性相关的宿主细胞固有的脆弱性,例如局部细胞拥挤和胆固醇含量。我们的方法基于形态学或分子宿主细胞参数预测单层上皮细胞中沙门氏菌感染的概率。在这里,我们提供了工作流程的详细描述,包括基于计算机的分析管道。我们的方法有可能应用于研究宿主 - 病原体相互作用的其他组合。

【背景】鼠伤寒沙门氏菌血清型鼠伤寒沙门氏菌通过摄入受污染的食物或水感染宿主,引起沙门氏菌病。一旦细菌到达肠道的远端回肠,它们就会侵入广泛的宿主细胞,包括肠上皮细胞(Watson和Holden,2010)。在宿主细胞入侵的第一阶段,沙门氏菌选择其目标,使用其鞭毛游泳并扫描上皮表面(Misselwitz et ...

Generation of Human Mesenchymal Stem Cell 3D Spheroids Using Low-binding Plates
Author:
Date:
2018-08-20
[Abstract]  The 3D culture of human mesenchymal stem cells (hMSCs) represents a more physiological environment than classical 2D culture and has been used to enhance the MSC secretome or extend cell survival after transplantation. Here we describe a simple and affordable method to generate 3D spheroids of hMSCs by seeding them at high density in a low-binding 96-well plate.

Spheroids of hMSCs cultured in low-binding 96-well plates can be used to study the basic biology of the cells and to generate conditioned media or spheroids to be used in transplantation therapeutic approaches. These MSCs or their secretome can be used as a regenerative therapy and for tissue repair across multiple disease areas, including neurodegeneration.

In comparison to other methods (hanging drop, use ...
[摘要]  人间充质干细胞(hMSC)的3D培养代表比经典2D培养更生理的环境,并且已经用于增强MSC分泌组或移植后延长细胞存活。 在这里,我们描述了一种简单且经济实惠的方法,通过在低密度96孔板中高密度接种hMSC来生成三维球状体。

在低结合96孔板中培养的hMSC的球状体可用于研究细胞的基本生物学并产生用于移植治疗方法的条件培养基或球状体。 这些MSC或其分泌蛋白组可用作再生疗法和用于多个疾病区域的组织修复,包括神经变性。

与其他方法(悬滴,使用凝胶或生物材料,磁悬浮,等)相比,此处描述的方法简单且经济实惠,无需使用专用设备,昂贵材料或复杂试剂。

【背景】 间充质干细胞(MSCs)是开发针对中风或肌萎缩侧索硬化等疾病的新型再生疗法的有吸引力的候选者(Chen et al。,2001; Bang et al。,2005; Boido et al。,2014)。它们的多功能性使得技术的优化和标准化对于确保MSC疗法可以提供尽可能多的益处是必不可少的。使MSC的治疗潜力(例如,增强的抗炎介质分泌)最大化的一种可能方式是以3D方式培养它们(Bartosh ...

Sleeping Beauty Transposon-based System for Rapid Generation of HBV-replicating Stable Cell Lines
Author:
Date:
2018-07-05
[Abstract]  The stable HBV-transfected cell lines, which based on stable integration of replication-competent HBV genome into hepatic cells, are widely used in basic research and antiviral drug evaluation against HBV. However, previous reported strategies to generate HBV-replicating cell lines, which primarily rely on random integration of exogenous DNA by plasmid transfection, are inefficient and time-consuming. We newly developed an all-in-one Sleeping Beauty transposon system (denoted pTSMP-HBV vector) for robust generation of stable HBV-replicating cell lines of different genotype. The pTSMP-HBV vector contains HBV 1.3-copy genome and dual selection markers (mCherry and puromycin resistance gene), allowing rapid enrichment of stably-transfected cells via red fluorescence-activated cell sorting ... [摘要]  稳定的HBV转染细胞系基于将复制能力的HBV基因组稳定整合到肝细胞中,广泛用于基础研究和针对HBV的抗病毒药物评估。然而,先前报道的产生HBV复制细胞系的策略(其主要依赖于通过质粒转染的外源DNA的随机整合)是低效且耗时的。我们新开发了一体化睡眠美容转座子系统(表示为pTSMP-HBV载体),用于稳定产生不同基因型的稳定HBV复制细胞系。 pTSMP-HBV载体含有HBV1.3拷贝基因组和双重选择标记(mCherry和嘌呤霉素抗性基因),允许通过红色荧光激活细胞分选和嘌呤霉素抗生素选择快速富集稳定转染的细胞。在该方案中,我们描述了构建HBV复制稳定细胞和系统评估这些细胞的HBV复制和病毒蛋白表达谱的详细程序。

【背景】慢性乙型肝炎病毒(HBV)感染目前是一个主要的公共卫生负担,影响全球超过2.4亿人(Witt-Kehati et al。,2016)。慢性HBV患者患慢性活动性肝炎,肝硬化或原发性肝细胞癌(HCC)的风险升高(Schweitzer et al。,2015)。目前用干扰素-α或核苷类似物治疗并不能根除病毒,它们对清除乙型肝炎表面抗原(HBsAg)的作用有限(Lucifora和Protzer,2016; Soriano et al。,2017) 。因此,迫切需要开发新的抗病毒抑制剂(Nassal,2015)。

用于评估新药抗HBV活性的细胞培养模型是新药开发的重要工具。稳定的HBV复制细胞系,携带复制能力的HBV基因组稳定整合到人肝癌细胞系(Huh7和/或HepG2)的基因组中,被广泛用于评估抗病毒药物的作用(Witt-Kehati ...

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