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- •JImmunol.2017May1;198(9):3729-3736.
Description | GSK583isahighlypotentandselectiveinhibitorofRIP2Kinase,withIC50of5nM. |
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IC50&Target | IC50:5nM(RIP2K)[1] |
InVitro | GSK583(1μM)exhibitsexcellentselectivityinapanelof300kinases,includingp38αandVEGFR2.GSK583potentlyanddosedependentlyinhibitsMDP-stimulatedtumornecrosisfactor-alpha(TNFα)productionwithanIC50of8nM.GSK583demonstratesonlyamodestreductioninpotencywhenprofiledinasimilarMDP-inducedTNFαproductionassayinhumanwholeblood(IC50=237nM)andratwholeblood(IC50=133nM)[1]. |
InVivo | GSK583(0.1,1,and10mg/kg,p.o.)inhibitsserumKC(therodentorthologueofIL-8)levelsinratsinadose-dependentmanner,withanIC50derivedfromratbloodconcentrationsof50nM(or20ng/mL).Similarly,GSK583inhibitsserumKClevelsandrecruitmentofneutrophilsintotheperitonealcavityinmiceinadose-dependentmanner,withanIC50of37nM(15ng/mL)derivedfrommousebloodconcentration[1]. |
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KinaseAssay [1] | AfluorescentpolarizationbasedbindingassayisdevelopedtoquantitateinteractionofnoveltestcompoundsattheATPbindingpocketofRIP2KbycompetitionwithafluorescentlylabeledATPcompetitiveligand.FulllengthFLAGHistaggedRIP2KispurifiedfromabaculovirusexpressionsystemandisusedatafinalassayconcentrationoftwicetheKDapparent.AfluorescentlabeledligandthatisreversIBLeandcompetitivewiththeinhibitorsisusedatafinalassayconcentrationof5nM.Boththeenzymeandligandarepreparedinsolutionsin50mMHEPESpH7.5,150mMNaCl,10mMMgCl2,1mMDTT,and1mMCHAPS.Testcompoundsarepreparedin100%DMSO,and100nLisdispensedtoindividualwellsofamultiwellplate.Next,5μLofRIP2Kisaddedtothetestcompoundsattwicethefinalassayconcentrationandincubatedatroomtemperaturefor10min.Followingtheincubation,5μLofthefluorescentlabeledligandsolutionisaddedtoeachreactionattwicethefinalassayconcentrationandincubatedatroomtemperatureforatleast10min.Finally,samplesarereadonaninstrumentcapableofmeasuringfluorescentpolarization.Testcompoundinhibitionisexpressedaspercent(%)inhibitionofinternalassaycontrols.Forconcentrationresponseexperiments,normalizeddataarefitusingthefollowingfourparameterlogisticequation:y=A+((B-C))/(1+(10x)/(10C)D),whereyisthe%activity(%inhibition)ataspecifiedcompoundconcentration,Aistheminimum%activity,Bisthemaximum%activity,C=log10(IC50),D=Hillslope,x=log10(compoundconcentration[M]),andpIC50=(−C).MCEhasnotindependentlyconfirmedtheaccuracyofthesemethods.Theyareforreferenceonly. | ||||||||||||||||||||||||||
AnimalAdmiNISTration [1] | Mice[1] References |
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