Cell Counting Kit-8简称CCK-8试剂盒,是一种基于WST-8(化学名:2-(2-甲氧基-4-硝苯基)-3-(4-硝苯基)-5-(2,4-二磺基苯)-2H-四唑单钠盐)的广泛应用于细胞增殖和细胞毒性的快速高灵敏度检测试剂盒。
WST-8属于MTT的升级产品,工作原理为:在电子耦合试剂存在的情况下,可以被线粒体内的脱氢酶还原生成高度水溶性的橙黄色的甲臜产物(formazan)。颜色的深浅与细胞的增殖成正比,与细胞毒性成反比。使用酶标仪在450nm波长处测定OD值,间接反映活细胞数量。
CCK-8法应用非常广泛,如药物筛选、细胞增殖测定、细胞毒性测定、肿瘤药敏试验以及生物因子的活性检测等。
操作简单:产品本身是液体,即开即用;甲臜产物是水溶性的,不需要用有机溶剂溶解。
灵敏度高:线性范围广,灵敏度高,重复性好。
细胞毒性低:细胞毒性非常低,对后续实验没有影响。
稳定性好:培养液中酚红和血清的存在不会对检测造成影响。
应用性广:可用于大规模、高通量样品检测。
同类产品性能比较:
细胞类型:293T人胚肾细胞;培养基:10% FBS 高糖DMEM培养基
孵育时间:3h;细胞数目:1000
引用已发表文献数据:
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GIST-T1细胞增殖检测CRTL为空白对照组,Lv-shNC为阴性干扰组,Lv-shOrai1为Orai1敲除组 | ROS17/2.8细胞增殖检测WT为野生型,KO为BK基因敲除组 |
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rMSCs细胞活性检测在2.5,5,10,20ug/mL的浓度 G/SWCNT hybrids, G, and SWCNTs处理下的细胞活性检测 | rMSCs细胞增殖检测G/SWCNT hybrids 在2.5,5,10,20ug/mL的浓度下处理1,3和7天细胞活性检测 |
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Huh6细胞干扰EZH2基因和阴性对照组细胞活性检测 | HepG2细胞干扰EZH2基因和阴性对照组细胞活性检测 |
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GIST-T1 细胞活性检测分别在2-APB 不同浓度0, 50, 100, and 150µM处理下的细胞活力检测 | GIST-T1 细胞活性检测分别在SKF-96365不同浓度下0, 0.5, 1.0, and 1.5µM处理下胞活力检测 |
冰袋运输,-25~-15“C避光干燥保存,有效期2年。
Q:CCK-8 的保存和稳定性如何?
A:CCK-8 稳定性高,避光条件-20℃有效期 2 年,4℃有效期 1 年。经常使用建议 4℃ 保存,避免反复冻融。CCK 正常颜色为粉红色,若颜色发生明显偏差,质量可能有发生变化。
Q:CCK-8 的细胞毒性如何?
A:CCK-8 毒性非常低,因此 CCK-8 检测完后相同的细胞还能用于其它细胞增殖检测如结晶紫染色法,中性红染色法或 DNA 荧光染色法。
Q:CCK-8 会对活细胞进行染色吗?
A:不会,首先 WST-8 不会进入细胞染色,整个显色反应都是在培养体系中进行的。另外 WST 和 WST-8 甲臜都属于高度水溶性组分,反应结束更换新的培养液,即可清除外源组分。因为 CCK-8 是基于 WST-8 能够被线粒体内的脱氢酶还原生成高度水溶性的橙黄色甲臜产物(Formazan)的原理研制开发的,因而不会对细胞进行染色。
Q:培养基的本底颜色如酚红会不会影响细胞活性的检测呢?
A:不会的,培养基中酚红的吸光度可以在计算时,通过扣除空白孔中本底的吸光度而消去,因此不会对检测造成影响。
Q:在加入 CCK-8 时可否不更换培养基?
A:一般情况下可以不更换培养基。但是如果培养基里有氧化还原性物质的话,有可能会产生误差,必须更换其它培养基。
Q:在实验中OD 值太高或者太低,怎么解决?
A:太高可以缩短加入CCK-8 后的培养时间。例如:可以把加入CCK-8 试剂后的培养时间由 2 小时缩短为 1 小时。此外,可适当减少细胞的数量。太低可以采取 2 个办法: 1、适当增加细胞数量 2、延长加入CCK-8 试剂后的反应时间。
Q:哪些物质会影响 CCK-8 的实验测定结果?
A:当培养体系内含有还原性物质存在时会还原 WST-8,从而使 OD 值增加;当有氧化性物质存在时会抑制还原反应进而使 OD 值减小。
Q:做细胞毒性实验,我的细胞都死了,为什么我加入CCK8试剂后检测的OD值和对照组OD值差不多?
A:①细胞凋亡或者死亡之后乳酸脱氢酶被释放到细胞培养液中,可以长期存在,从而导致检测的OD值偏大。再次说明细胞的活性和OD值并不能完全划等号。建议客户在加入CCK8的时候更换新的培养基,确保得到准确的结果。
②加入细胞中的检测药物是还原性的,从而导致OD值偏高。建议加入CCK8的时候更换新的培养基。
Q:对照组(培养基+CCK8)的值很高,是为什么呢?
A:可以测一下培养基是否含有氧化还原物质,可能是培养基中的物质引起的。
Q: 细胞不贴壁可以测活性吗?预培养是必须的吗?
A: 需要预培养,如果要向保持细胞的最好状态,建议预培养细胞。如果不做细胞预培养 ,细胞内的脱氢酶可能会不稳定。若不做细胞预培养,需在做标准曲线和检测时需要统一检测条件。
Q: CCK-8能否检测细菌细胞?
A: 可以检测大肠杆菌,但不能检测酵母细胞。向100μl E.coli培养液中加入10μl CCK-8溶液,并培养1-4个小时或过夜。
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