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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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  • BC2165
  • 2025年11月12日
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    • 文献和实验
    • 技术资料
    • 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

    产品细节图片1

    线粒体异柠檬酸脱氢酶(isocitrate dehydrogenaseICDHm),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。

    产品细节图片2

    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,0.04mLCpr:样本蛋白浓度,mg/mL,需自行测定;V反总:反应体系总体积,0.2mLT:反应时间,1h=60min103: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÷(W×V÷V提取)÷T×103=16.83×x÷W

    V提取:加入提取液体积,1.01mLV样:加入上清液体积,0.04mLW:样本质量,gT:反应时间,1h=60min103: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÷(W×V÷V提取)÷T×103=6.73×x÷W

    V提取:沉淀重悬时加入提取液体积,0.404mLV样:加入上清液体积,0.04mLW:样本质量,gT:反应时间,1h=60min103: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:ICDHmU/g 质量)=16.83×x÷W+6.73×x÷W

    实验实例:

    1、 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ICDHmU/g 质量)=16.83×x÷W+6.73×x÷W=7.43 U/g质量。

    2、 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,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ICDHmU/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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