“无懈可击”的磷酸酶居然被他撼动了!
英国剑桥大学的分子生物学实验室利用新系统平台发现一种分子可以靶向磷酸酶,减少小鼠大脑亨廷顿氏病相关蛋白积累。 该发现发表于《Cell》杂志。 磷酸酶(phosphatases)是许多细胞信号传递的关键。大多数信号通路始于一个激活信号,激酶(kinase)捕获一个化学标签(磷酸基团)到特定蛋白质上,从而改变它们的功能。信号的停止来自磷酸酶截断磷酸基团。 细胞中包含200多种磷酸酶类型,涉及方方面面的生物进程,任何药物必须有选择性地靶向正确的一种类型,否则就会产生严重副作用或直接杀死细胞。 虽然已经有许多针对激酶的药物被成功开发(如抗癌药物),但是特异性靶向特定磷酸酶的药物却是一片空白。因为切断磷酸基团这一功能对所有磷酸酶来说是通用的。因此,只要能抑制一种磷酸酶,该药物就能抑制上百种磷酸酶,很导致细胞死亡。 领导这项研究的分子生物学家Anne Bertolotti博士说:“几十年来,我们根本没有办法选择性地靶向磷酸酶,......阅读全文
十二烷基羟丙基磷酸酯甜菜碱的性质
两性磷酸酯表面活性剂分子由两部分组成,一部分是含氮的阳离子部分,由胺、季铵的长链衍生物构成;另一部分是阴离子部分,由磷酸酯盐构成。此结构决定其不仅具有两性表面活性剂的优良的润湿性、洗净性、增溶性、乳化分散性、抗静电性、热稳定性等,以及良好的配伍性,较低的刺激性,和优于一般阴离子表面活性剂的耐碱性
简述克林霉素磷酸酯片的药理作用
克林霉素磷酸酯为化学合成的克林霉素衍生物,它在体外无抗菌活性,进入体内后迅速被水解为克林霉素发挥抗菌活性。 体外试验表明,克林霉素对以下微生物有活性: 1.需氧革兰氏阳性球菌:金黄色葡萄球菌和表皮葡萄球菌(均包括产青霉素酶和不产青霉素酶的菌株)、链球菌(粪肠道球菌除外)、肺炎球菌。 2.厌
克林霉素磷酸酯外用溶液的基本性状
克林霉素磷酸酯的检查及鉴别方法
关于注射用克林霉素磷酸酯的简介
注射用克林霉素磷酸酯,适应症为 1.用于革兰氏阳性菌引起的下列各种感染性疾病: (1)扁桃体炎、化脓性中耳炎、鼻窦炎等. (2)急性支气管炎、慢性支气管炎急性发作、肺炎、肺脓肿和支气管扩张合并感染等. (3)皮肤和软组织感染:疖、痈、脓肿、蜂窝组织炎、创伤、烧伤和手术后感染等. (4)
克林霉素磷酸酯注射液的检查方法
pH值应为5.5~7.0(通则0631)。颜色取本品5瓶,分别与黄色2号标准比色液(通则0901第一法)比较,均不得更深。有关物质照高效液相色谱法(通则0512)测定供试品溶液精密量取本品适量,用溶剂定量稀释制成每1ml中约含克林霉素3mg的溶液对照溶液精密量取供试品溶液适量,用溶剂定量稀释制成每1
Cell-Extraction-Protocol
实验概要Primary tissues are valuable tools for the study of intracellular and extracellular markers which characterize disease states. We have developed
Cell-counting/plating
OverviewCount the number of viable cells in a culture via dilution plating. The following assumes E. coli cells but it should apply to any type of cel
Cryopreservation-of-cell-cultures
1. Examine all flasks by inverted-phasemicroscopy. Cultures used for preservation should be grown free of antibiotics, show no signs of microbial cont
Cryopreservation-of-Cell-Lines
AimThe protocol below describes the use of passive methods involving an electric -80ºC freezer for the cryopreservation of cell cultures. ECACC routin
cell-proliferation-assay
cell proliferation assaybefore start:thaw cells from liquid nitrogen, grow in 75cc flask (T75) in Fischer's medium MM (maintenance medium) until c
Competent-Cell-Preparation
实验概要Competent cells are those that possess more easily altered cell walls that DNA can be passed through easily. These cells readily incorporate f
Staining-Methods-for-cell
death Z. Xia 10/2/95The simplest way: trypan blue. Dead cells stain blueNon-fixed cells: FDA(fluorescein diacetate)-green, alive cells; P.I. (propidiu
CELL-MEMBRANE-PREPARATION
I. Solutions: A. Ca and Mg free Phosphate Buffered Saline (PBS) solution, buffered with 0.02M Hepes. pH=7.4 B. Ca and Mg free PBS, buffered with
Working-Cell-Bank
1) Keep prepared solutions on ice.2) Determine total cell count of cells to be frozen. (e.g. 1 X 108 )3) Determine number of vials to be frozen. (e.g.
Cell-Viability-Assay
Dye exclusiona cell suspension is mixed with trypan blue and examined by low-power microscopyMaterialscellsPBSM3hemocytometer0.4 % trypan blue in PBSm
Microscopes-in-Cell-Biology
Microscopes in Cell BiologyIntroductionMicroscopy has a major role in the study of cells. From the very beginning, researchers have tried to develop w
DNA-Cell-Cycle
Solutions70% ethanolribonuclease (100 µg/ml DNase free, Sigma)propidium iodide ( 50 µg/ml in PBS)ProcedureHarvest cells. Spin at 1200 rpm for 5 minute
Cell-Sorting-By-FACS
Currently, the Moflo instrument (Dakocytomation) is used to sort cells at the AECOM FACS facility.Sorting is performed by the person in charge at the
Bacterial-cell-culture
MaterialsGlass culture tubes with metal caps and labelsGrowth medium, from media room or customizedGlass pipette tubesParafilmEquipmentVortexerFireboy
Cell-Cycles--Introduction
The onion root tip and the whitefish blastula remain as the standard introduction to the study of mitosis. The onion has easily observable chromosomes
Maintenance-of-Cell-Culture
Maintenance of Cell CultureAuthor: Nanci DonackiSource: Contributed by Nanci DonackiDate Added: Tue May 14 2002Date Modified: Tue Apr 27 2004Abstract:
Master-Cell-Bank
PurposeTo describe the preparation of a Master Cell BankSafetySee SP 09-001 for lab safety considerations for the cell culture lab.EquipmentLaminar Fl
Protocol-for-Cell-Fusion
Healthy Sp2/0 cells should be rapidly growing by this time. Sp 2/0 cells should be started about two weeks before the cell fusion. Every two days, the
CELL-CYCLE-ANALYSIS
PROPIDIUM IODIDE: The most commonly used dye for DNA content/cell cycle analysis is PROPIDIUM IODIDE (PI). It can be used to stain whole cells or isol
Cell-Stem-Cell八大热点文章(6月)
《Cell Stem Cell》杂志是2007年Cell出版社新增两名新成员之一(另外一个杂志是Cell Host & Microbe),这一杂志内容涵盖了从最基本的细胞和发育机制到医疗软件临床应用等整个干细胞生物学研究内容。这一杂志特别关注胚胎干细胞、组织特异性和癌症干细胞的最新成果。《Cel
Cell-Stem-Cell十大热点文章(12月)
《Cell Stem Cell》杂志是2007年Cell出版社新增两名新成员之一(另外一个杂志是Cell Host & Microbe),这一杂志内容涵盖了从最基本的细胞和发育机制到医疗软件临床应用等整个干细胞生物学研究内容。这一杂志特别关注胚胎干细胞、组织特异性和癌症干细胞的最新成果。《C
Cell-Stem-Cell八大热点文章(10月)
生物通报道:《Cell Stem Cell》杂志是2007年Cell出版社新增两名新成员之一(另外一个杂志是Cell Host & Microbe),这一杂志内容涵盖了从最基本的细胞和发育机制到医疗软件临床应用等整个干细胞生物学研究内容。这一杂志特别关注胚胎干细胞、组织特异性和癌症干细胞的最新成
Cell-Stem-Cell综述:如何更好的培养干细胞
人类多能干细胞(hPSC)包括胚胎干细胞(hESC)和诱导多能干细胞(hiPSC),是再生医学和药物研发的重要细胞资源。过去十年来,人们开发了各种各样的hPSC培养方法。美国NIH的Kevin G. Chen等人在《Cell Stem Cell》杂志发表综述,对不同培养方法和培养成分进行了比较,
Cell-Stem-Cell八大热点文章(11月)
《Cell Stem Cell》杂志是2007年Cell出版社新增两名新成员之一(另外一个杂志是Cell Host & Microbe),这一杂志内容涵盖了从最基本的细胞和发育机制到医疗软件临床应用等整个干细胞生物学研究内容。这一杂志特别关注胚胎干细胞、组织特异性和癌症干细胞的最新成果。《Cel
Cell-Stem-Cell十大热点文章(5月)
《Cell Stem Cell》杂志是2007年Cell出版社新增两名新成员之一(另外一个杂志是Cell Host & Microbe),这一杂志内容涵盖了从最基本的细胞和发育机制到医疗软件临床应用等整个干细胞生物学研究内容。这一杂志特别关注胚胎干细胞、组织特异性和癌症干细胞的最新成果。《Cel