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Trypsin-EDTA

Company: Sigma-Aldrich
Catalog#: 59427C
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Imaging of Human Cancer Cells in 3D Collagen Matrices
Author:
Date:
2021-01-20
[Abstract]  

Research on cell migration and interactions with the extracellular matrix (ECM) was mostly focused on 2D surfaces in the past. Many recent studies have highlighted differences in migratory behaviour of cells on 2D surfaces compared to complex cell migration modes in 3D environments. When embedded in 3D matrices, cells constantly sense the physicochemical, topological and mechanical properties of the ECM and adjust their behaviour accordingly. Changes in the stiffness of the ECM can have effects on cell morphology, differentiation and behaviour and cells can follow stiffness gradients in a process called durotaxis. Here we introduce a detailed protocol for the assembly of 3D matrices consisting of collagen I/fibronectin and embedding cells for live cell imaging. Further, we will show how

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[摘要]  [摘要]细胞迁移及其与细胞外基质(ECM)相互作用的研究最多过去专注于2D曲面。最近的许多研究都强调了与3D环境中复杂的细胞迁移模式相比,2D表面上的细胞迁移行为的差异。当嵌入3D矩阵中时,细胞会不断感知ECM的物理化学,拓扑和机械特性,并相应地调整其行为。ECM刚度的变化会影响细胞的形态,分化和行为,并且细胞会在称为durotaxis的过程中遵循刚度梯度。在这里,我们介绍了由胶原蛋白I /纤连蛋白和包埋细胞组成的3D矩阵的详细协议,用于活细胞成像。此外,我们将展示如何通过非酶糖基化来增强基质,以及用荧光染料对胶原蛋白进行染色如何使基质和细胞同时成像。该方法可用于在具有不同刚度的3D微环境中对细胞迁移进行成像,定义细胞-基质相互作用以及细胞对变化的ECM的反应,并可视化细胞的基质变形。


[背景]细胞和依赖于动态周围的细胞外基质(ECM)生成的功能性实体的调整两者的,基质和细胞,以预防疾病。多年来,人们一直认为ECM仅为嵌入式细胞提供结构支持。但是,最近的研究突出了ECM的关键功能,而不是其脚手架功能。ECM的修饰已与疾病进展相关,尤其是在癌症的背景下,与转移的发生有关,以及与临床预后和患者生存的相关性。

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Analyzing the Quenchable Iron Pool in Murine Macrophages by Flow Cytometry
Author:
Date:
2020-03-20
[Abstract]  Tissue-resident macrophages are pivotal for a tightly-regulated iron metabolism at a cellular and systemic level, since subtle iron alterations increase the susceptibility for microbial infections or drive multiple diseases. However, research on cellular iron homeostasis in macrophages remains challenging due to the limited amount of available methods using radioactive 59Fe isotopes or strong iron chelators, which might be inapplicable in certain experimental settings. This protocol describes the analysis of the quenchable iron pool (QIP) in macrophages by loading these cells with exogenous iron-complexes. Thereby, the cytoplasmic iron pool can be determined, since the iron uptake ability of macrophages inversely correlates with intracellular iron levels. Thus, this assay ... [摘要]  [摘要 ] 驻留在组织中的巨噬细胞对于在细胞和全身水平上严格调节铁代谢至关重要,因为细微的铁改变会增加对微生物感染的敏感性或引发多种疾病。然而,由于使用放射性59 Fe同位素或强铁螯合剂的可用方法数量有限,因此巨噬细胞中细胞铁稳态的研究仍然具有挑战性,这在某些实验环境中可能不适用。该协议 描述了通过向这些细胞加载外源铁配合物来分析巨噬细胞中的可淬灭铁池(QIP)。因此,由于巨噬细胞的铁摄取能力与细胞内铁水平成反比,因此可以确定细胞质的铁库。因此,该测定法能够准确分析细胞质铁通量的微小变化,并且几乎适用于所有实验室环境。另外,该方案还可以用于体外和体内的其他免疫细胞类型。

[背景 ] 由于用于全身铁代谢它们的中心调节功能,在多种组织中的巨噬细胞中迅速地改变在不同的刺激的遭遇它们的细胞内的铁水平的微生物感染和疾病(Nairz 等人,2017) 。值得注意的是,大多数细胞中的铁离子被细胞质中的主要铁存储蛋白铁蛋白结合或定位于线粒体或溶酶体等区室(Ma 等,2015 ; Soares和Hamza,2016 ...

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