{{'Search' | translate}}
 

Opti-MEMTM I Reduced Serum Medium

Opti-MEM ® I Reduced Serum Medium

Company: Thermo Fisher Scientific
Catalog#: 31985070
Bio-protocol()
Company-protocol()
Other protocol()

Hypoxia Reporter Element Assay
Author:
Date:
2018-08-05
[Abstract]  Hypoxia is a condition in which there is a decrease in oxygen supply to the cellular environment. Changes to cellular oxygen levels can lead to transcriptional changes of oxygen-regulated genes. Reporter assays are used to study gene expression alteration and modifications in response to environmental changes. Dual-reporter assays allow the simultaneous measurement of two different genes within a single cell, thus improving experimental accuracy. Within this protocol, we describe the utilization of the LightSwitch Dual Assay System to measure BMX expression in response to hypoxic conditions. [摘要]  缺氧是细胞环境中氧供应减少的一种情况。 细胞氧水平的变化可导致氧调节基因的转录变化。 报告分析用于研究响应环境变化的基因表达改变和修饰。 双报告分析允许同时测量单个细胞内的两个不同基因,从而提高实验准确性。 在该协议中,我们描述了LightSwitch双重测定系统的使用,以测量响应缺氧条件的BMX表达。

【背景】在我们最近的出版物(van Oosterwijk et al。,2018)中,我们试图检测BMX(一种非受体酪氨酸激酶)对索拉非尼治疗的反应。 BMX是一种Tec激酶家族成员,已知与酪氨酸磷酸化蛋白结合并通过与磷脂酰肌醇3,4,5-三磷酸结合而介导膜靶向(PIP3; Chen 等人,2013)。我们发现索拉非尼在有或没有基质细胞支持的急性髓性白血病(AML)细胞系中的直接治疗对BMX的上调没有贡献。以前的研究表明缺血可诱导BMX表达,索拉非尼具有抗血管生成活性(He et al。,2006; Davis et al。,2011)。因此,我们假设索拉非尼的抗血管生成活性导致骨髓内的缺氧环境,从而导致AML中缺氧依赖性BMX上调。在缺氧条件下,我们能够显示许多不同细胞系中BMX表达的显着增加。 BMX启动子的进一步分析在-5005处鉴定出推定的缺氧反应元件(HRE; ...

Preserve Cultured Cell Cytonemes through a Modified Electron Microscopy Fixation
Author:
Date:
2018-07-05
[Abstract]  Immunocytochemistry of cultured cells is a common and effective technique for determining compositions and localizations of proteins within cellular structures. However, traditional cultured cell fixation and staining protocols are not effective in preserving cultured cell cytonemes, long specialized filopodia that are dedicated to morphogen transport. As a result, limited mechanistic interrogation has been performed to assess their regulation. We developed a fixation protocol for cultured cells that preserves cytonemes, which allows for immunofluorescent analysis of endogenous and over-expressed proteins localizing to the delicate cellular structures. [摘要]  培养细胞的免疫细胞化学是用于确定细胞结构内蛋白质的组成和定位的常用且有效的技术。 然而,传统的培养细胞固定和染色方案不能有效地保存培养的细胞色素,长期专门用于形态发生转运的丝状伪足。 结果,进行了有限的机械审讯以评估其监管。 我们开发了一种用于培养细胞的固定方案,该方案保留了细胞质,允许对内源性和过表达的蛋白质进行免疫荧光分析,这些蛋白质定位于脆弱的细胞结构。

【背景】Cytonemes被分类为薄的(~200nm直径)基于肌动蛋白的丝状伪足,长度超过2μm,可以转运形态发生素(Ramírez-Weber和Kornberg,1999)。这些信号结构首先在发育中的 Drosophila 翼成像盘中进行了详细分类和描述,随后在小鼠,小鸡和斑马鱼模型生物中进行了观察(Ramírez-Weber和Kornberg,1999; Sanders et al。,2013; Stanganello et al。,2015)。在大多数情况下,只有对过表达的荧光标记蛋白进行实时成像才能进行细胞色素检测。由于传统的固定方案未能保存这些脆弱的细丝,因此对培养细胞的细胞色素的检查受到限制。这些并发症一直是决定在发育和组织稳态期间驱动细胞色素形成和功能的细胞机制以及确定这些过程是否在疾病中被破坏的限制因素。

为了克服这些限制,我们开发了一种基于修饰电子显微镜固定剂(MEM-fix)的方案,该方案可以保留培养细胞的细胞质。 ...

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 ...

Comments