
线粒体异柠檬酸脱氢酶(ICDHm)活性检测试剂盒微量法
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- 保存条件:
-20°C
- 保质期:
6个月
- 英文名:
Isocitrate Dehydrogenase Mitochondrial(ICDHm) Activity Assay Kit
- 库存:
999
- 供应商:
北京索莱宝科技有限公司
- CAS号:
BC2165-100T/48S
- 规格:
100管/48样

线粒体异柠檬酸脱氢酶(isocitrate dehydrogenase,ICDHm),广泛存在于动物、植物、微生物和培养细胞的线粒体中,与线粒体基因表达及线粒体其他的功能有关。异柠檬酸脱氢酶在生物体内有两种存在形式,以NAD为辅酶的NAD-依赖型异柠檬酸脱氢酶,和以NADP为辅酶的NADP-依赖型异柠檬酸脱氢酶。
异柠檬酸脱氢酶的主要功能,是在体内三羧酸循环中,催化异柠檬酸生成α-酮戊二酸,将NAD还原成NADH,通过测定α-酮戊二酸的生成量,可以计算出线粒体异柠檬酸脱氢酶活力高低。
注意:实验之前建议选择2-3个预期差异大的样本做预实验。如果样本吸光值不在测量范围内建议稀释或者增加样本量进行检测。
需自备的仪器和用品:
低温离心机、可见分光光度计/酶标仪、水浴锅/恒温培养箱、微量玻璃比色皿/96孔板、可调式移液枪、研钵/匀浆器、冰和蒸馏水。
操作步骤:
一、样本处理(可适当调整待测样本量,具体比例可以参考文献)
1. 称取约0.2 g组织或收集1000万细胞,加入1mL提取液一和10μL提取液二,用冰浴匀浆器或研钵匀浆。
2. 4℃,1000g离心10min。将上清液移至另一离心管中,4℃,11000g离心15min。
3. 上清液即胞浆提取物,可用于测定从线粒体泄漏的异柠檬酸脱氢酶(此步可选做,可以判断线粒体提取效果)。
4. 在沉淀中加入400μL提取液三和4μL提取液二,超声波破碎(功率300w,超声5秒,间隔9秒,4min),4℃,10000g离心10min,取上清液用于线粒体异柠檬酸脱氢酶活性测定,并且用于蛋白含量测定。

三、ICDHm活性计算
1、标准曲线绘制
以各个标准溶液的浓度为x轴,其对应的ΔA标准为y轴,绘制标准曲线,得到标准方程y=kx+b,将ΔA带入方程得到x(μmol/mL)。
2、酶活力计算
酶活定义:每mg组织蛋白在反应体系中每分钟产生1nmol α-酮戊二酸定义为一个酶活性单位。
ICDHm酶活力(U/mg prot)=x×V上清÷(Cpr×V上清)÷T×103=x÷Cpr×16.67
V上清:加入上清液体积,0.04mL;Cpr:样本蛋白浓度,mg/mL,需自行测定;V反总:反应体系总体积,0.2mL;T:反应时间,1h=60min;103:单位换算系数,1μmol =103nmol。
注意事项:
1、 为保证实验结果的准确性,需先取1-2个样做预实验,如果测定的吸光值过高(高于1),可用提取液三稀释上清液后再测定。计算结果时注意乘以稀释倍数。
2、 推荐使用样本蛋白浓度计算酶活,若用样本质量计算,则需加测胞浆提取物酶活,上清和沉淀酶活之和方为总酶活。
3、 测定蛋白浓度时,由于试剂一本身含有蛋白(约1mg/mL),所以测定时需扣除此部分蛋白。
4、 附:使用样本重量计算公式
A、上清(胞浆)中ICDHm活力计算:
酶活定义:每g组织在反应体系中每分钟产生1nmol α-酮戊二酸定义为一个酶活性单位。
ICDHm活性(U/g 质量)=x×V样÷(W×V样÷V提取)÷T×103=16.83×x÷W
V提取:加入提取液体积,1.01mL;V样:加入上清液体积,0.04mL;W:样本质量,g;T:反应时间,1h=60min;103:单位换算系数,1μmol =103nmol。
B、沉淀(线粒体)中ICDHm活力计算:
酶活定义:每g组织在反应体系中每分钟产生1nmol α-酮戊二酸定义为一个酶活性单位。
ICDHm活性(U/g 质量)=x×V样÷(W×V样÷V提取)÷T×103=6.73×x÷W
V提取:沉淀重悬时加入提取液体积,0.404mL;V样:加入上清液体积,0.04mL;W:样本质量,g;T:反应时间,1h=60min;103:单位换算系数,1μmol =103nmol。
C、样本ICDHm总活力计算:
样本ICDHm总活力即为上清(胞浆)中ICDHm活力与沉淀(线粒体)中ICDHm活力之和。
按样本质量计算:ICDHm(U/g 质量)=16.83×x÷W+6.73×x÷W
实验实例:
1、 取0.2g小鼠肾脏加入1.5 mL提取液一和15 μL提取液二,用冰浴匀浆器匀浆。4℃,1000g离心10min。将上清液移至另一离心管中,4℃,11000g离心15min。上清液即胞浆提取物,在沉淀中加入600μL提取液三和6μL提取液二,超声波破碎,4℃,10000g离心10min,取上清液,分别按操作步骤检测,用96孔板测得:胞浆ΔA测定=A测定管-A对照管=0.25-0.25=0,线粒体ΔA测定=A测定管-A对照管=0.433-0.279=0.154,带入标准曲线y=0.5533x+0.0319计算x值,按样本质量计算酶活得:
胞浆中ICDHm活性(U/g质量)=16.83×x÷W=0 U/g质量
线粒体中ICDHm活性(U/g质量)=6.73×x÷W=7.43 U/g质量
样本总ICDHm(U/g 质量)=16.83×x÷W+6.73×x÷W=7.43 U/g质量。
2、 取0.3g黑麦草加入1.5mL提取液一和15μL提取液二,用冰浴匀浆器匀浆。4℃,1000g离心10min。将上清液移至另一离心管中,4℃,11000g离心15min。上清液即胞浆提取物,上清液稀释2倍,在沉淀中加入600μL提取液三和6μL提取液二,超声波破碎,4℃,10000g离心10min,取上清液稀释2倍,分别按操作步骤检测,用96孔板测得:胞浆ΔA测定=A测定管-A对照管=0.377-0.34=0.037,线粒体ΔA测定=A测定管-A对照管=0.711-0.649=0.062,带入标准曲线y=0.5533x+0.0319计算x值,按样本质量计算酶活得:
胞浆中ICDHm活性(U/g质量)=16.83×x÷W×2=1.55 U/g质量
线粒体中ICDHm活性(U/g质量)=6.73×x÷W×2=3.66U/g质量
样本总ICDHm(U/g 质量)=16.83×x÷W×2+9.16×x÷W×2=5.21 U/g质量。
相关发表文献:
[1] Xiao Li,Qi Zhao,Jianni Qi,et al. lncRNA Ftx promotes aerobic glycolysis and tumor progression through the
PPARγ pathway in hepatocellular carcinoma. International Journal of Oncology. May 2018;(IF3.571)
参考文献:
[1] Igamberdiev A U, Gardeström P. Regulation of NAD-and NADP-dependent isocitrate dehydrogenases by reduction levels of pyridine nucleotides in mitochondria and cytosol of pea leaves[J]. Biochimica et Biophysica Acta (BBA)-Bioenergetics, 2003, 1606(1-3): 117-125.

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类:· Serine proteases· Cysteine proteases· Aspartic acid proteases· Zinc metalloproteases图示:比色蛋白酶试验响应曲线。采用 Thermo Scientific Pierce 比色法蛋白酶检测试剂盒,通过与提供的胰蛋白酶标准品进行比较,测定 V-8 蛋白酶和颌下腺蛋白酶消化酪蛋白底物的活性。以上即为PTMs的概述(资料来自Thermo Fisher官网),欢迎留言评论
探针很容易被装载到细胞内。细胞内的活性氧可以氧化无荧光的DCFH生成有荧光的DCF。检测DCF的荧光就可以知道细胞内活性氧的水平。活性氧检测试剂盒[9]。荧光法检测线粒体产生和释放的反应性氧化物(ROS)[10]。羟基自由基的检测(二羟苄胺DHBAs和水杨酸盐Salicylate)[11] ROS was evaluated by the staining of 2’,7’- dichlorofluorescein diacetate(二氯荧光乙酰乙酸盐).ROS production
化物质检测等。 美国著名细胞产品公司Cell BioLabs为您提供完备的细胞氧化应激分析解决方案,其产品包含蛋白质羰基化、硝基化损伤及晚期氧化蛋白产物(AOPP)分析,脂质过氧化的标志物壬烯(HNE)和丙二醛(MDA)以及8-异前列腺素F2a快速检测试剂盒,核酸DNA/RNA的常规损伤分析如8-OHdG/8-OHG和AP位点检测,还包括细胞水平的彗星分析和DNA双链断裂分析试剂盒;除此之外,还有多种抗氧化物的活性检测方案供您选择,如过氧化物歧化酶(SOD)、过氧化氢酶 (CAT)及ORAC指标
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