Description:
Angiogenesisprovidesthecruciallinkbetweentheavascularandvascularstatesandisakeyeventforsustainedtumorgrowthandcancerprogression.AngiogenesisasaBIOLOGicalswitchprocessisgovernedbynumerouspro-andanti-angiogenicfactors,includingvascularendothelialgrowthfactor(VEGF),basicfibroblastgrowthfactor(FGFb),epidermalgrowthfactor(EGF),andtransforminggrowthfactor-beta(TGF-b).Themechanismofactionofeachofthesefactorsisdifferent,asaretheiroriginandthestimulifortheirproduction.Theangiogenicswitchreferstothebalancebetweenpro-andanti-angiogenicfactors.Therefore,profilingofthesefactorsiscriticaltounderstandingangiogenesis.Signosis’AngiogenesisELISAStripIProfilingAssayallowssimultaneouslyprofiling8angiogenesiscytokines. Eachwellofthestripiscoatedwithaprimaryantibodyagainstaspecificangiogenesisproteinandtotal8wellsofastriptarget8differentproteins.Thedifferenceoftheseproteinsbetweentwosamplescanbedeterminedthroughdatacomparison.Principle:
Eachwellofthestripiscoatedwithaspecificcaptureantibodytodetectitscorrespondingcytokineinthesample.Therefore,8differentproteinscanbemeasuressimultaneously.Thetestsamplereactssimultaneouslywithtwoantibodies,resultinginthecytokinesbeingsandwichedbetweenthesolidphaseandenzyme-linkedantibodies.Afterincubation,thewellsarewashedtoremoveunbound-labeledantibodies.TheHRPsubstrate,TMB,isthenaddedandcausesabluecolorchange.ThereactionisthenterminatedwithStopSolution,resultinginayellowcolor.Theconcentrationsofoxidativestresscytokinesaredirectlyproportionaltothecolorintensityofthetestsample.Absorbanceismeasuredspectrophotometricallyat450nm.Theexpressionlevelsofthesecytokinescanbequantitativelycomparedbetweensamples.

Data:

HumanAngiogenesisELISAstripIforprofiling8cytokines.HeLacellsweretreatedwith(redbars)orwithout(lightblue)10ng/mlTNF.Conditionedmediawerecollected(top)andcelllysateswereprepared(bottom)forELISAstripprofiling.
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第一次:包被抗体浓度为:8ug/ml,4,2,1,0.5,0.25,0为A,B,C,D,E,F,G
血清稀释度为1:100
酶标抗体稀释度为:1:1000,1:5000,1:10000,1:25000为1,2,3,4
结果为:1234
A3.3440.7120.4900.238
B2.7570.5230.3450.176
C2.4280.4550.3100.172
D>4.51.7771.2150.439
E>4.51.3570.7890.424
F1.1090.2540.1720.110
G1.3660.3310.1970.069(空白)从结果可以判断包被抗体浓度1ug/ml最合适
第二次:包被抗体1ug/ml
血清稀释度为1:25,1:50,1:100,1:150,1:200,1:250,1:300,空白为A,B,C,D,E,F,G,H
酶标抗体稀释度为:1:1000,1:5000,1:10000,1:25000为1,2,3,4
结果为:1234
A2.9930.6390.3380.236
B3.0210.7220.3070.191
C2.3360.4960.3080.176
D2.2560.4640.3040.176
E2.0310.4160.2470.139
F1.8300.3360.2310.153
G1.5980.3320.2270.132
空白H0.1580.0780.0720.074
这样的话应该是血清稀释度1:50最合适,酶标抗体稀释度1:1000最合适,但是这样的话OD值为3.021,是不是太大了?OD值是不是在1左右比较好呢?应该选择哪个浓度,哪个稀释度来做正式试验呢?
1. 直接法测定抗原 2.间接法测定抗体 3.双抗体夹心法测定抗原4. 竞争法测定抗原 厚百生物专业提供各类生化实验试剂、仪器、耗材,提供技术服务,满足您的实验室常规采购需求。厚百,让您更省心!
后采用豆粉浸提12000g离心取上清的方式,发现10的5、6、7、8次方稀释度所测OD值随着稀释度的升高而增大,比如一个样品的OD值5次方为0.2558次方为0.349;
刚接触相关知识,试验任务较重,心中疑问较大,恳请各位高手及时指正,诚谢!
1. 包被:用0.05M PH9,碳酸盐包被缓冲液将抗体稀释至蛋白质含量为1~10μg/ml,在每个聚苯乙烯板的反应孔中加0.1ml,4℃过夜。次日,弃去孔内溶液,用洗涤缓冲液洗3次,每次3分钟。
2. 加样:加一定稀释的待检样品0.1ml于上述已包被之反应孔中,置37℃孵育1小时。然后洗涤。(同时做空白孔,阴性对照孔及阳性对照孔)。
3. 加酶标抗体:于各反应孔中,加入新鲜稀释的酶标抗体(经滴定后的稀释度)0.1ml,37℃孵育0.5~1小时,洗涤。
4. 加底物液显色:于各反应孔中加入临时配制的TMB底物溶液0.1ml,37℃10~30分钟。
5. 终止反应:于各反应孔中加入2M硫酸0.05ml。
6. 结果判定:可于白色背景上,直接用肉眼观察结果:反应孔内颜色越深,阳性程度越强,阴性反应为无色或极浅,依据所呈颜色的深浅,以“+”、“-”号表示。也可测OD值:在ELISA检测仪上,于450nm(若以ABTS显色,则410nm)处,以空白对照孔调零后测各孔OD值,若大于规定的阴性对照OD值的2.1倍,即为阳性。
方法二:用于检测未知抗体的间接法:
用包被缓冲液将已知抗原稀释至1~10μg/ml,每孔加0.1ml,4℃过夜。次日洗涤3次。加一定稀释的待检样品(未知抗体)0.1ml于上述已包被之反应孔中,置37℃孵育1小时,洗涤。(同时做空白、阴性及阳性孔对照)于反应孔中,加入新鲜稀释的酶标第二抗体(抗抗体)0.1ml,37℃孵育30~60分钟,洗涤,最后一遍用DDW洗涤。其余步骤同“双抗体夹心法”的4、5、6。
下图为ELISA原理图,夹心法即Sandwich ELISA,竞争法就是Competitive ELISA
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