Preparation
1.SamplePreparationandStorage
Storesamplestobeassayedwithin24hoursat2-8°C.Forlong-termstorage,aliquotandfreezesamplesat-20°C.Avoidrepeatedfreeze-thawcycles.
Cellculturesupernates:Removeparticulatesbycentrifugation,assayimmediatelyoraliquotandstoresamples
at-20°C.
Serum:Allowtheserumtoclotinaserumseparatortube(about4hours)atroomtemperature.Centrifugeatapproximately1000Xgfor15min.Analyzetheserumimmediatelyoraliquotandstoresamplesat-20°C.
Plasma:CollectplasmausingheparinorEDTAasananticoagulant.Centrifugefor15minat1500xgwithin30minofcollection.Assayimmediatelyoraliquotandstoresamplesat-20°C.
2.SampleDilutionGuideline
Theuserneedstoestimatetheconcentrationofthetargetproteininthesampleandselectaproperdilutionfactorsothatthedilutedtargetproteinconcentrationfallsnearthemiddleofthelinearregimeinthestandardcurve.Dilutethesampleusingtheprovideddiluentbuffer.Thefollowingisaguidelineforsampledilution.Severaltrialsmaybenecessaryinpractice.Thesamplemustbewellmixedwiththediluentsbuffer.
Hightargetproteinconcentration(1μg-10μg/ml).Theworkingdilutionis1:100.i.e.Add3μlsampleinto297μlsamplediluentbuffer.
Mediumtargetproteinconcentration(100-1000ng/ml).Theworkingdilutionis1:10.i.e.Add25μlsampleinto225μlsamplediluentbuffer.
Lowtargetproteinconcentration(1.56-100ng/ml).Theworkingdilutionis1:2.i.e.Add100μlsampleto100μlsamplediluentbuffer.
VeryLowtargetproteinconcentration(≤1.56ng/ml).Nodilutionnecessary,ortheworkingdilutionis1:2.
3.ReagentPreparationandStorage
A.ReconstitutionofthehumanAdiponectinstandard:Adiponectinstandardsolutionshouldbepreparednomorethan2hourspriortotheexperiment.TwotubesofAdiponectinstandard(100ngpertube)areincludedineachkit.Useonetubeforeachexperiment.
a.100ng/mlofhumanAdiponectinstandardsolution:Add1mlsamplediluentbufferintoonetube,keepthetubeatroomtemperaturefor10minandmixthoroughly.
b.50ng/ml→1.56ng/mlofhumanAdiponectinstandardsolutions:Label6Eppendorftubeswith50ng/ml,25ng/ml,12.5ng/ml,6.25ng/ml,3.12ng/ml,1.56ng/mlrespectively.Aliquot0.3mlofthesamplediluentbufferintoeachtube.Add0.3mloftheabove100ng/mlAdiponectinstandardsolutioninto1sttubeandmix.Transfer0.3mlfrom1sttubeto2ndtubeandmix.Transfer0.3mlfrom2ndtubeto3rdtubeandmix,andsoon.
Note:Thestandardsolutionsarebestusedwithin2hours.The100ng/mlstandardsolutionshouldbestoredat4°Cforupto12hours,orat-20°Cforupto48hours.Avoidrepeatedfreeze-thawcycles.
B.Preparationofbiotinylatedanti-humanAdiponectinantibodyworkingsolution:Thesolutionshouldbepreparednomorethan2hourspriortotheexperiment.
a.Thetotalvolumeshouldbe:0.1ml/wellx(thenumberofwells).(Allowing0.1-0.2mlmorethantotalvolume)
b.Biotinylatedanti-humanAdiponectinantibodyshouldbedilutedin1:100withtheantibodydiluentbufferandmixedthoroughly.(i.e.Add1μlBiotinylatedanti-humanAdiponectinantibodyto99μlantibodydiluentbuffer.)
C.PreparationofAvidin-Biotin-PeroxidaseComplex(ABC)workingsolution:Thesolutionshouldbepreparednomorethan1hourpriortotheexperiment.
a.Thetotalvolumeshouldbe:0.1ml/wellx(thenumberofwells).(Allowing0.1-0.2mlmorethantotalvolume)
b.Avidin-Biotin-PeroxidaseComplex(ABC)shouldbedilutedin1:100withtheABCdilutionbufferandmixedthoroughly.(i.e.Add1μlABCto99μlABCdiluentbuffer.)
AssayProcedure
TheABCworkingsolutionandTMBcolordevelopingagentmustbekeptwarmat37°Cfor30minbeforeuse.Whendilutingsamplesandreagents,theymustbemixedcompletelyandevenly.StandardAdiponectindetectioncurveshouldbepreparedforeachexperiment.TheuserwilldecidesampledilutionfoldbycrudeestimationofAdiponectinamountinsamples.
1.Aliquot0.1mlperwellofthe100ng/ml,50ng/ml,25ng/ml,12.5ng/ml,6.25ng/ml,3.12ng/ml,1.56ng/mlhumanAdiponectinstandardsolutionsintotheprecoated96-wellplate.Add0.1mlofthesamplediluentbufferintothecontrolwell(Zerowell).Add0.1mlofeachproperlydilutedsampleofhumancellculturesupernates,serumorplasma(heparin,EDTA)toeachemptywell.See“SampleDilutionGuideline”abovefordetails.ItisrecommendedthateachhumanAdiponectinstandardsolutionandeachsamplebemeasuredinduplicate.
2.Sealtheplatewiththecoverandincubateat37°Cfor90min.
3.Removethecover,discardplatecontent,andblottheplateontopapertowelsorotherabsorbentmaterial.DoNOTletthewellscompletelydryatanytime.
4.Add0.1mlofbiotinylatedanti-humanAdiponectinantibodyworkingsolutionintoeachwellandincubatetheplateat37°Cfor60min.
5.Washplate3timeswith0.01MTBSor0.01MPBS,andeachtimeletwashingbufferstayinthewellsfor1min.Discardthewashingbufferandblottheplateontopapertowelsorotherabsorbentmaterial.(PlateWashingMethod:Discardthesolutionintheplatewithouttouchingthesidewalls.Blottheplateontopapertowelsorotherabsorbentmaterial.Soakeachwellwithatleast0.3mlPBSorTBSbufferfor1~2minutes.RepeatthisprocesstwoadditionaltimesforatotalofTHREEwashes.Note:Forautomatedwashing,aspirateallwellsandwashTHREEtimeswithPBSorTBSbuffer,overfillingwellswithPBSorTBSbuffer.Blottheplateontopapertowelsorotherabsorbentmaterial.)
6.Add0.1mlofpreparedABCworkingsolutionintoeachwellandincubatetheplateat37°Cfor30min.
7.Washplate5timeswith0.01MTBSor0.01MPBS,andeachtimeletwashingbufferstayinthewellsfor1-2min.Discardthewashingbufferandblottheplateontopapertowelsorotherabsorbentmaterial.(SeeStep5forplatewashingmethod).
8.Add90μlofpreparedTMBcolordevelopingagentintoeachwellandincubateplateat37°Cindarkfor
25-30min(Note:Forreferenceonly,theoptimalincubationtimeshouldbedeterminedbyenduser.AndtheshadesofbluecanbeseeninthewellswiththefourmostconcentratedhumanAdiponectinstandardsolutions;theotherwellsshownoobviouscolor).
9.Add0.1mlofpreparedTMBstopsolutionintoeachwell.Thecolorchangesintoyellowimmediately.
10.ReadtheO.D.absorbanceat450nminamicroplatereaderwithin30minafteraddingthestopsolution.
Forcalculation,(therelativeO.D.450)=(theO.D.450ofeachwell)–(theO.D.450ofZerowell).ThestandardcurvecanbeplottedastherelativeO.D.450ofeachstandardsolution(Y)vs.therespectiveconcentrationofthestandardsolution(X).ThehumanAdiponectinconcentrationofthesamplescanbeinterpolatedfromthestandardcurve.
Note:ifthesamplesmeasuredwerediluted,multiplythedilutionfactortotheconcentrationsfrominterpolationtoobtaintheconcentrationbeforedilution.
Summary
1.Addsamplesandstandardsandincubatetheplateat37°Cfor90min.Donotwash.
2.Addbiotinylatedantibodiesandincubatetheplateat37°Cfor60min.Washplate3timeswith0.01MTBS.
3.AddABCworkingsolutionandincubatetheplateat37°Cfor30min.Washplate5timeswith0.01MTBS.
4.AddTMBcolordevelopingagentandincubatetheplateat37°Cindarkfor25-30min.
5.AddTMBstopsolutionandread.
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2.Yokota,T.;Oritani,K.;Takahashi,I.;Ishikawa,J.;Matsuyama,A.;Ouchi,N.;Kihara,S.;Funahashi,T.;Tenner,A.J.;Tomiyama,Y.;Matsuzawa,Y.:Adiponectin,anewmemberofthefamilyofsolubledefensecollagens,negativelyregulatesthegrowthofmyelomonocyticProgenitorsandthefunctionsofmacrophages.Blood96:1723-1732,2000.
3.Takemura,Y.;Ouchi,N.;Shibata,R.;Aprahamian,T.;Kirber,M.T.;Summer,R.S.;Kihara,S.;Walsh,K.:Adiponectinmodulatesinflammatoryreactionsviacalreticulinreceptor-dependentclearanceofearlyapoptoticbodies.J.Clin.Invest.117:375-386,2007.
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