{{'Search' | translate}}
 

Cholesterol

胆固醇

Company: Sigma-Aldrich
Catalog#: C8667
Bio-protocol()
Company-protocol()
Other protocol()

Total Triglyceride Quantification in Caenorhabditis elegans
Author:
Date:
2020-11-20
[Abstract]  Several studies suggest an important role of lipid metabolism in regulating longevity of Caenorhabditis elegans. Therefore, assays to quantify lipids have enormous value in understanding aging and pathologies associated with it. Approximately 70% of lipid metabolism genes in the nematode have orthologs in humans. Amenability of C. elegans to genetic manipulations has allowed investigations into the role of specific genetic factors in lipid metabolism. Here, we describe a protocol to quantify total triglycerides in C. elegans, which can be extended to studies of the effects of altered environmental and genetic factors on stored fats. This protocol quantifies the picomoles of the triglycerides, in whole worm lysate. Due to the sensitivity of the assay, it could ... [摘要]  [摘要]多项研究表明脂质代谢在调节秀丽隐杆线虫的寿命中具有重要作用。因此,定量脂质的测定在理解衰老和与其相关的病理学方面具有巨大价值。线虫中大约70%的脂质代谢基因在人类中具有直系同源物。秀丽隐杆线虫对基因操作的适应性允许调查特定遗传因素在脂质代谢中的作用。在这里,我们描述了一个协议,以定量总甘油三酯在秀丽隐杆线虫,这CA n可以扩展到环境和遗传因素改变对储存脂肪的影响的研究。该协议量化了整个蠕虫裂解物中甘油三酸酯的皮摩尔。由于测定的敏感性,它可以帮助鉴定总存储脂肪的细微变化,这是显微镜技术无法识别的。


[背景]多余的卡路里通常以三酰基甘油或糖原的形式存储(Cohen,2018年)。甘油三酸酯(TAGs)的异常水平与人类的心脏病,胰腺炎和动脉粥样硬化有关(Cameron等人,1974; Lee等人,2003; Walther和Farese,2012; Onal等人,2017)。TAG被包装到细胞质中的脂滴中。脂质液滴存在于真核细胞中,大小从20 nm到100 µm不等(Stobart等,1986; ...

Liposome Flotation Assay for Studying Interactions Between Rubella Virus Particles and Lipid Membranes
Author:
Date:
2018-08-20
[Abstract]  Rubella virus (RuV) is an enveloped, positive-sense single-stranded RNA virus that is pathogenic to humans. RuV binds to the target cell via the viral envelope protein E1, but the specific receptor molecules on the target cell are yet to be fully elucidated. Here, we describe a protocol for liposome flotation assay to study direct interactions between RuV particles and lipid membranes in a qualitative manner. Interactions are examined by a Nycodenz density gradient fractionation using UV-inactivated RuV particles and fluorescent-labeled liposomes consisting of pure lipids. Fractionated RuV particles are detected using standard sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) followed by Western blot analysis for viral proteins. On the Nycodenz gradient, RuV particles ... [摘要]  风疹病毒(RuV)是一种包膜的正义单链RNA病毒,对人类具有致病性。 RuV通过病毒包膜蛋白E1与靶细胞结合,但靶细胞上的特异性受体分子尚未完全阐明。在这里,我们描述了脂质体浮选测定的方案,以定性方式研究RuV颗粒和脂质膜之间的直接相互作用。使用UV-灭活的RuV颗粒和由纯脂质组成的荧光标记的脂质体通过Nycodenz密度梯度分级检查相互作用。使用标准十二烷基硫酸钠 - 聚丙烯酰胺凝胶电泳(SDS-PAGE)检测分级的RuV颗粒,然后对病毒蛋白进行Western印迹分析。在Nycodenz梯度上,与未结合的RuV颗粒相比,与脂质体结合的RuV颗粒转移至较低密度的部分。使用该方案,我们提供了令人信服的证据,即在中性pH下以钙依赖性方式,RuV颗粒与某些细胞类型中含有鞘磷脂(SM)和胆固醇的脂质膜结合。

【背景】 风疹病毒是“风疹”的致病因子,“风疹”是一种急性且相对轻微的全身性感染和“先天性风疹综合征”,一种导致严重出生缺陷的转胎胎儿感染(Hobman,2013)。阐明RuV进入的分子机制对于了解病毒病理学和帮助开发抗RuV药物是必不可少的。虽然以前的研究表明宿主细胞的膜脂质作为RuV受体(Mastromarino et al。,1989和1990; DuBois et ...

FRAP: A Powerful Method to Evaluate Membrane Fluidity in Caenorhabditis elegans
Author:
Date:
2018-07-05
[Abstract]  FRAP (Fluorescence Recovery After Photobleaching) is probably the most direct method to investigate the dynamics of molecules in living cells. Here, we describe FRAP to quantify membrane fluidity in C. elegans. Using FRAP, we have shown that cold, glucose and exogenous saturated fatty acids can decrease the fluidity of cellular membranes in certain mutants. [摘要]  FRAP(光漂白后的荧光恢复)可能是研究活细胞中分子动力学的最直接方法。 在这里,我们描述FRAP来量化 C中的膜流动性。线虫。 使用FRAP,我们已经表明冷,葡萄糖和外源饱和脂肪酸可以降低某些突变体中细胞膜的流动性。

【背景】生物膜,定义所有细胞的特征,主要由磷脂组成(Van Meer 等人,,2008)。存在于磷脂双层中的脂肪酸物质极大地影响其性质。例如,高饱和脂肪酸含量增加了膜的刚性,而高不饱和脂肪酸含量促进了流动性(Pilon,2016)。细胞膜的脂肪酸组成通常与膳食脂肪的组成明显相关,膳食脂肪可直接掺入磷脂中(Abbott et al。,2012; Dancy et al。,2015)。然而,考虑到饮食中存在广泛的变化,细胞必须具有调节机制,监测和调节膜组成并获得所需的膜性质,例如流动性,曲率,厚度,等等。使用FRAP对在肠道细胞中表达prenylated GFP的蠕虫,我们先前已经证明,缺乏PAQR-2(哺乳动物脂联素受体的同源物)的突变体在葡萄糖或富含饱和脂肪的饮食中培养时降低了膜流动性。酸(Svensk et al。,2016; Devkota et ...

Comments