PTEN(PhosphataseandTensinHomologdeletedonChromosome10)isa3’phosphoinositidephosphatasethatconvertsPI(3,4,5)P3toPI(4,5)P2,thusopposingPKB/AktactivationbyPI3-K.PTENisinvolvedinneuronalstemcellproliferationandself-renewal,cardiacmyocytehypertrophyandcontractility,andawiderangeofdevelopmentalprocesses.PTEN,however,isbestknownforitsroleasatumorsuppressor.LossofPTENactivityresultsinaccumulationofPI(3,4,5)P3,abnormalactivationofPKB/Akt,unregulatedcellgrowth,suppressionofapoptosis,andincreasedtumOrigenesisinanumberofhumantissues.IthasalsobeenproposedthatPTENisacandidatefortargetedchemotherapybecausecertainanti-canceragentspreferentiallydestroytumorswithPTENmutations.Inadditiontothisdirectroleincancer,PTENhasrecentlybeenshowntoregulatecancer-associatedpathwaysincludingVEGF-mediatedangiogenesisandothers. ThePTENActivityELISAdirectlydetectsthephosphoinositideproductcomparedtootherassays,whichdetectfreephosphate.ThiseliminatesmanypossIBLesourcesoferrorduetothefactthatinorganicphosphateistheproductofmanyphosphataseenzymeactivities,andisfoundincommonbuffersandcleaningproducts.TheassayisacompetitiveELISAinwhichthesignalisinverselyproportionaltotheamountofPI(4,5)P2produced.AfterthePTENreactionsarecomplete,reactionproductsareaddedtothePI(4,5)P2-coatedmicroplateandaPI(4,5)P2detectorproteinisthenaddedforcompetitivebinding.Aperoxidase-linkedsecondarydetectorandcolorimetricdetectionisusedtodetectPI(4,5)P2detectorbindingtotheplate.ThecolorimetricsignalisinverselyproportionaltotheamountofPI(4,5)P2producedbyPTEN. StoragePart14°C,Part2-20°CFeaturedinPublications1)Tzenaki,N.,M.Aivaliotis,etal.(2015)."Focaladhesionkinasephosphorylatesthephosphataseandtensinhomologdeletedonchromosome10underthecontrolofp110δphosphoinositide-3kinase."FasebJ.doi:10.1096/fj.15-274589 2)Guo,S.T.,M.N.Chi,etal.(2015)."INPP4Bisanoncogenicregulatorinhumancoloncancer."Oncogene.doi:10.1038/onc.2015.361RelatedProducts:PTENenzyme(E-3000) MalachiteGreenAssayKit(K-1500) PTENSubstrates:P-3908,P-3916,Q-1345 SF1670(PTENInhibitor)(B-0350) OtherLipidPhosphatases:SHIP2(E-1000),INPP4A(E-8000)
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