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G20x1 ½ injection cannula, Sterican

Company: Braun
Catalog#: 4657519
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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 ...

Assessment of Uptake and Biodistribution of Radiolabeled Cholesterol in Mice Using Gavaged Recombinant Triglyceride-rich Lipoprotein Particles (rTRL)
Author:
Date:
2018-07-05
[Abstract]  The here described method can be used to estimate the uptake of orally provided cholesterol in mice. Briefly, mice are gavaged with radiolabeled cholesterol and 4 h later, organ distribution of the radiolabel is determined by liquid scintillation counting. The method has been applied successfully to determine dietary cholesterol handling of mice housed at different ambient temperatures [摘要]  这里描述的方法可用于估计小鼠口服提供的胆固醇的摄取。 简而言之,用放射性标记的胆固醇强饲小鼠,4小时后,通过液体闪烁计数测定放射性标记的器官分布。 该方法已成功应用于确定在不同环境温度下饲养的小鼠的膳食胆固醇处理

【背景】胆固醇促进膜的流动性,并且是类固醇激素,胆汁酸和维生素D的前体。动物通过饮食或通过 de novo 合成提供胆固醇。胆固醇的过剩可能是有害的,因为它在血管壁中的积累可导致动脉粥样硬化。已经表明,通过冷处理棕色脂肪组织(BAT)可以降低高胆固醇血症(Berbee 等,,2015)。然而,尚不清楚最佳可行技术活动是否会改变急性外周膳食胆固醇处理。为了解决这个问题,我们口服给予小鼠富含重组富含甘油三酯的脂蛋白颗粒(rTRL),用[4- 14 C] - 胆固醇标记,并在管饲后4小时测量放射性标记的器官分布。之前已经测量了放射性标记的胆固醇体内的生物分布(Szigeti 等,,1972; Townsend et al。,2001)。然而,在这些研究中,放射性胆固醇由饮食提供或静脉注射。此外,其他研究评估了较长时间内(48和72小时)的胆固醇吸收率(Zilversmit和Hughes,1974; Turley et ...

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