| A Transient Transfection-based Cell Adhesion Assay with 293T Cells
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Author:
Date:
2021-01-05
[Abstract] The in vitro cell adhesion assay is a quantitative method for measuring selective cell adhesion to specific proteins. Traditionally, cell adhesion assays employ purified protein immobilized on a solid glass or plastic surface. Here, we describe a transient 293T cell transfection-based cell adhesion assay to study selective cell adhesion of a specific cell type to a protein of interest. In this protocol, 293T cells are transfected with a mammalian expression plasmid containing mSiglec1 cDNA or an empty plasmid as a mock control and are then cultured to form a monolayer. Subsequently, these Siglec1-expressing and mock-transfected 293T cell monolayers are used for cell adhesion assays with GFP-expressing B16F10 cells. The number of GFP+ cancer cells adhering to each 293T monolayer is a ...
[摘要] [摘要]的体外细胞粘附分析是一种用于测量到特定蛋白选择性细胞粘附的定量方法。传统上,细胞粘附测定采用固定在固体玻璃或塑料表面上的纯化蛋白质。在这里,我们描述了基于瞬时293T细胞转染的细胞粘附试验,以研究特定细胞类型对目标蛋白质的选择性细胞粘附。在该协议中,将293T细胞用包含mSiglec1 cDNA的哺乳动物表达质粒或空质粒作为模拟对照转染,然后培养以形成单层。随后,将这些表达Siglec1和模拟转染的293T细胞单层用于表达GFP的B16F10细胞的细胞粘附测定。GFP +的数量 粘附在每个293T单层上的癌细胞是一种定量手段,用于比较癌细胞与Siglec1的选择性粘附性。该方法消除了表达和纯化目的蛋白以进行体外细胞粘附测定的需要,并且可以容易地用难以纯化的蛋白进行操作,同时保持其天然的原位结构。
关键词:细胞粘附试验,细胞粘附,癌细胞粘附试验,293T,瞬时转染,Siglec1,F荧光显微镜
[背景]细胞-细胞相互作用对于生物学过程,例如组织发育,再生,和临界形态发生,以及免疫应答和癌症转移(Gumbiner,1996 ...
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| Isolation of Tumor Cells Based on Their Distance from Blood Vessels
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Author:
Date:
2020-05-20
[Abstract] Differential exposure of tumor cells to microenvironmental cues greatly impacts cell phenotypes, raising a need for position based sorting of tumor cells amenable to multiple OMICs and functional analyses. One such key determinant of tumor heterogeneity in solid tumors is its vasculature. Proximity to blood vessels (BVs) profoundly affects tumor cell phenotypes due to differential availability of oxygen, gradient exposure to blood-borne substances and inputs by angiocrine factors. To unravel the whole spectrum of genes, pathways and phenotypes impacted by BVs and to determine spatial domains of vascular influences, we developed a methodology for sorting tumor cells according to their relative distance from BVs. The procedure exemplified here using glioblastoma (GBM) model is based on ...
[摘要] [摘要 ] 肿瘤细胞的差分暴露于微环境线索大大IM 协议小号细胞表型,提高基于需要位置的肿瘤细胞的分选适合于多个组学和功能分析。实体瘤中肿瘤异质性的此类关键决定因素之一是其脉管系统。邻近血管(的BV)深刻affec TS 肿瘤细胞表型是由于氧气的可利用性不同,对血源性物质的梯度暴露以及血管分泌因子的输入所致。为了揭示受BV影响的基因,通路和表型的整个谱图,并确定血管影响的空间域,我们开发了一种根据肿瘤细胞与BV的相对距离进行分类的方法。此处使用胶质母细胞瘤(GBM)模型示例的程序基于静脉内注射,自由扩散的荧光染料的差异摄取,该染料允许分离位于适合于后续OMIC和功能分析的不同连续微环境中的无基质肿瘤细胞。这种可靠,易于使用,具有成本效益的策略可以扩展到所有实体瘤,以研究脉管系统的影响或缺乏脉管系统的影响。
[背景 ] 在充足的血液供应肿瘤依赖已经提供了一种用于抗血管生成的癌症治疗的理由(Carmeliet和耆那,2000; Vasudev 等人,2013年)。传统上归因于氧气和其他血源性物质的提供,肿瘤脉管系统在肿瘤生物学中的作用最近扩展到包括由分泌的内皮产生的血管分泌因子施加的非灌注依赖性旁分泌输入(Butler 等人,2010; Beck 等人,2011; Lu 等人,2013),以及通过相互Notch信号传导介导的肿瘤-BV直接接触(Cao ...
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