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Pipettes: Eppendorf Research® Plus 10 μl

Company: Eppendorf
Catalog#: 3123000020
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Ex vivo Assessment of Mitochondrial Function in Human Peripheral Blood Mononuclear Cells Using XF Analyzer
Author:
Date:
2021-04-05
[Abstract]  

Cellular health and function, as we know today, depend on a large extent on mitochondrial function. The essential function of mitochondria is the energy production, more precisely ATP production, via oxidative phosphorylation. Mitochondrial energy production parameters therefore represent important biomarkers. Studies on human cells have mainly been performed on in vitro cell cultures. However, peripheral blood mononuclear cells (PBMCs) are particularly suitable for such examinations. That’s why this protocol describes a method to measure key parameters of mitochondrial function in freshly isolated PBMCs with the latest technology, the XF Analyzer. For this ex vivo approach PBMCs are first isolated out of human anticoagulated blood. Next, they are attached to the surface of special

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[摘要]  [摘要]正如我们今天所知,细胞的健康和功能在很大程度上取决于线粒体的功能。线粒体的基本功能是ENER GY生产,更精确的LY ATP生产,通过氧化磷酸化。因此,线粒体能量产生参数代表重要的生物标记。对人类细胞的研究主要是在体外细胞培养中进行的。然而,外周血单核细胞(PBMC)是特别升ý适于这样的检查。这就是为什么这个协议描述测量与最新的技术,新鲜分离的PBMC线粒体功能的关键参数的方法的XF分析。对于这个离体PBMC首先是从人抗凝血液中分离出来的。接下来,将它们附着到预先涂有Poly-D-Lysine的特殊微孔板的表面上。期间的氧消耗速率(OCR)以及细胞外酸化率(ECAR)的应力试剂寡,羰氰化物随后的测量4 - (三氟甲氧基)苯腙(FCCP),鱼藤酮和抗霉素A被注入。可以从获得的结果中计算出几个线粒体参数。该协议的应用允许分析对人体细胞的各种影响,例如药物或环境因素。


[背景]线粒体在维持正常细胞功能中起关键作用。现在众所周知,它们不仅通过氧化磷酸化产生ATP,而且还参与氨基酸,脂质和核苷酸的代谢,潜水信号转导和氧化还原过程以及质量控制和降解过程,包括线粒体和磷酸化。细胞凋亡(Pfanner等,2019)。然而,线粒体代表正常细胞中ATP合成的主要位点(Akbari等人,2019)。为此,通过多亚基酶复合物I – ...

Real-time Base Excision Repair Assay to Measure the Activity of the 8-oxoguanine DNA Glycosylase 1 in Isolated Mitochondria of Human Skin Fibroblasts
Author:
Date:
2021-03-20
[Abstract]  

7,8-dihydro-8-oxoguanine (8-oxoG) is one of the most common and mutagenic oxidative DNA damages induced by reactive oxygen species (ROS). Since ROS is mainly produced in the inner membranes of the mitochondria, these organelles and especially the mitochondrial DNA (mtDNA) contained therein are particularly affected by this damage. Insufficient elimination of 8-oxoG can lead to mutations and thus to severe mitochondrial dysfunctions. To eliminate 8-oxoG, the human body uses the enzyme 8-oxoguanine DNA glycosylase 1 (OGG1), which is the main antagonist to oxidative damage to DNA. However, previous work suggests that the activity of the human OGG1 (hOGG1) decreases with age, leading to an age-related accumulation of 8-oxoG. A better understanding of the exact mechanisms of hOGG1 could lead

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[摘要]  [摘要] 7,8-二氢-8-氧鸟嘌呤(8-oxoG)是由活性氧(ROS)引起的最常见且诱变的氧化DN A损伤之一。由于ROS主要在线粒体的内膜中产生,因此这些细胞器,特别是其中所含的线粒体DNA(mtDNA)受到这种损害的特别影响。消除8-oxoG可能会导致突变,从而导致严重的线粒体功能障碍。为了消除8-oxoG,人体使用了8-氧代鸟嘌呤DNA糖基化酶1(OGG1),它是DNA氧化损伤的主要拮抗剂。但是,先前的研究表明,人类OGG1的活性(h OGG1)随着年龄的增长而减少,导致与年龄相关的8-oxoG积累。更好地了解hOGG1的确切机制可能会导致发现新的靶标,因此对于开发预防性疗法具有重要意义。因此,我们开发了一种实时碱基切除修复测定法,该测定法采用了专门设计的双链报告寡核苷酸来测量分离的线粒体裂解物中hOGG1的活性。这里介绍的该系统与经典测定法不同,在经典测定法中,可以通过实时测量hOGG1活性通过变性丙烯酰胺凝胶进行终点测定。另外,为了确定该双功能酶的每个酶促步骤的活性(N-糖基化酶和AP-裂解酶活性),还可以进行解链曲线分析。使用各种离心步骤从人成纤维细胞中分离线粒体后,将其裂解,然后与专门设计的报告寡核苷酸一起孵育。hOGG1活性的后续测量是在常规实时PCR系统中进行的。

[背景]人体是永久的损害案例。每天约10 ...

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。 ...

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