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Centrifuge 5418/ 5418 R

离心机5418/5418 R

公司名称: Eppendorf
产品编号: 5418/5418R
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Measuring Procaspase-8 and -10 Processing upon Apoptosis Induction
Author:
Date:
2017-01-05
[Abstract]  Apoptosis or programmed cell death is important for multicellular organisms to keep cell homeostasis and for the clearance of mutated or infected cells. Apoptosis can be induced by intrinsic or extrinsic stimuli. The first event in extrinsic apoptosis is the formation of the Death-Inducing Signalling Complex (DISC), where the initiator caspases-8 and -10 are fully activated by several proteolytic cleavage steps and induce the caspase cascade leading to apoptotic cell death. Analysing the processing of procaspases-8 and -10 by Western blot is a commonly used method to study the induction of ... [摘要]  细胞凋亡或程序性细胞死亡对于多细胞生物保持细胞稳态和清除突变或感染细胞是重要的。 细胞凋亡可以由内在或外在的刺激诱导。 外源性凋亡中的第一个事件是死亡诱导信号复合物(DISC)的形成,其中引发剂半胱天冬酶-8和-10通过若干蛋白水解切割步骤完全活化并诱导胱天蛋白酶级联导致凋亡细胞死亡。 通过蛋白质印迹分析procaspases-8和-10的处理是通过死亡受体刺激研究凋亡诱导的常用方法。 为了分析procaspase-8和-10切割,用死亡配体刺激细胞不同的时间间隔,裂解,并使用抗半胱天冬酶-8和抗半胱天冬酶-10抗体进行蛋白质印迹分析。 这可以监测胱天蛋白酶切割产物,从而诱导细胞凋亡。

背景 胱天蛋白酶是作为无活性酶原产生并被蛋白水解切割活化的蛋白酶(Degterev等人,2003)。胱天蛋白酶级联的激活是凋亡细胞死亡期间最重要的事件,其诱导凋亡细胞的典型生化和形态学变化。与非活性执行者procaspases相反,启动子胱天蛋白酶8/9/10具有限制性蛋白水解活性,并在高分子量复合物中完全活化(Lavrik等人,2005)。促凋亡受体TNF-R1(肿瘤坏死因子受体1),CD95 / ...

Isolation of Primary Breast Cancer Cells from HER2 Transgenic Mice
Author:
Date:
2016-10-05
[Abstract]  HER2 is a tyrosine kinase receptor, which is overexpressed in about 30% of breast cancer patients. Its overexpression leads to mammary tumorigenesis and increased invasion and metastasis (Slamon et al., 1987). HER2 transgenic mouse (FVB/N-MMTVneu mouse) is a well-established model of mammary tumor in human (Fantozzi and Christofori, 2006). Although in vivo models are excellent for assessing the influence of various factors, especially microenvironment, on development of breast cancer, a convenient and less costly way to study the underlying molecular events is utilizing ... [摘要]  HER2是酪氨酸激酶受体,其在约30%的乳腺癌患者中过表达。 其过表达导致乳腺肿瘤发生和增加的侵袭和转移(Slamon等人,1987)。 HER2转基因小鼠(FVB/N-MMTVneu小鼠)是人类乳腺肿瘤的良好建立的模型(Fantozzi和Christofori,2006)。 虽然体内模型对于评估各种因素,特别是微环境对乳腺癌发展的影响是极好的,但是一种方便且成本较低的研究基础分子事件的方法是利用来自模型的细胞 评价。 为了探索HOXB7抑制起始,但促进乳腺肿瘤转移的分子机制,我们从HER2转基因小鼠产生小鼠乳腺癌细胞系(Liu等人,2015)。 该方案可用于从具有其他遗传背景的小鼠产生乳腺癌细胞系。

Spectrophotometric Determination of Glutamine Synthetase Activity in Cultured Cells
Author:
Date:
2016-10-05
[Abstract]  Glutamine synthetase (GS), which catalyzes the conversion of glutamate and ammonia to glutamine, is widely distributed in animal tissues and cell culture lines. The importance of this enzyme is suggested by the fact that glutamine, the product of GS-catalyzed de novo synthesis reaction, is the most abundant free amino acid in blood (Smith and Wilmore, 1990). Glutamine is involved in many biological processes including serving as the nitrogen donor for biosynthesis, as an exchanger for the import of essential amino acids, as a means to detoxifying intracellular ammonia and glutamate, and as a ... [摘要]  谷氨酰胺合成酶(GS),其催化谷氨酸和氨转化成谷氨酰胺,广泛分布在动物组织和细胞培养系中。该酶的重要性通过谷氨酰胺,GS-催化的从头合成反应的产物,是血液中最丰富的游离氨基酸的事实提示(Smith和Wilmore,1990)。谷氨酰胺参与许多生物过程,包括作为生物合成的氮供体,作为输入必需氨基酸的交换剂,作为解毒细胞内氨和谷氨酸的手段,以及作为生物能量营养物来给三羧酸(TCA)周期(Bott等人,2015)。用于测定GS酶活性的方法依赖于其γ-谷氨酰转移酶反应,通过测量由谷氨酰胺和羟胺合成的γ-谷氨酰羟肟酸酯,以及反应产物与反应物的色谱分离(Deuel等人 。,1978)。 GS谷氨酰转移酶反应的概述可以在图1中找到。通过分光光度测定法在560nm的特定波长下使用酶标仪测量GS活性。该方法简单,并且具有与应用放射性标记的底物的那些方法相当的灵敏度。该修改的方法已经应用于在包括人乳腺上皮MCF10A细胞和鼠前B FL5.12细胞的培养细胞系中测定/测定GS活性,并且可以用于测量其他细胞系中的GS活性。 >


图1 。GS glutamyl ...

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