口服药物的体外吸收模型.ppt
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InVitroModelsforOralDrugAbsorptionOutlinenPhysicalandBiochemicalBarrierforOralDrugAbsorptionandInVitromodelsfordrugabsorptionnEvaluationoftheMethodCaco-2CellSuitabilitynUseofCaco2andFactorAffectingPermeationofNCEnContinuousDissolution/Caco-2SystemforFormulationScreeningofNCEBLightmicrographofmonkeysmallintestinalmucosaillustratingthethreelayersofthemucosa:
theepithelium(E),thelaminapropria(L),andthemuscularismucosa(M).(takenfromJ.L.MaderaandJ.S.TrierinPhysiologyoftheGastrointestinalTract(L.R.Johnson,Ed.),2ndEdition,RavenPress,NewYork,1987,p.1210)LEMIntestinalMucosa:
APhysicalandBiochemicalBarrierforOralDrugAbsorptionViewofIntestinalMucosa,Pre-1990ACurrentViewofIntestinalMucosa?
BasolateralApicalParacellularDiffusionTranscellularDiffusionMetabolismABEffluxTransportACDMultidrugResistanceTransportersandCYP3AsFormaConcertedBarriertoDrugAbsorptionMultidrugResistanceTransporters(MDR1,MRP2,BCRP)CYP3AsApicalsideBasolateralsideMetabolizedSubstratedrugDrugmetaboliteMDR1(P-glycoprotein,P-gp)Inhibitorse.g.GF120918ABSubstratese.g.DigoxinExamplesofDrugsThatareSubstratesforMDR1CancerdrugsVinblastineVincristineTaxolDaunorubicinEtoposideImmunosuppressiveDrugsCyclosporinAFK506SteroidsDexamethasoneProgesteroneCortisolHIVproteaseinhibitorsAmprenavirIndinavirCardiacdrugsDigoxinQuinidineAnti-goutagentColchicineAntibioticErythromycinAnti-tuberculousagentRifampinSchematicIllustrationofMDR1,MRP1,MRP2,MRP3,MRP5andBCRPinTransfectedPolarizedEpithelialCellsReference:
P.Borstetal.,BBA1461,347-357(1999)J.Jonkeretal.,JNCI92(20),1651-1656(2000)MDR1MRP1MRP2MRP3MRP5ApicalsideBasolateralsideTightjunctionBCRPModelsUsedtoDeterminetheIntestinalMucosalPermeationCharacteristicsofaDrugCandidateOraldosingofanimalsorhumansIntestinalperfusionstudiesinhumansDosingofanimalsthroughachroniccannulaintheintestinallumenInSituintestinalperfusionstudiesinanimalsEffluxtransporter-geneknockoutmiceInVitropermeationstudiesusingexcisedhumanoranimalintestinalmucosaltissuesInVitropermeationstudiesusingcellculturemodelsPAMPA,IAMGastroPlusIntestinalPerfusionStudiesinHumansCorrelationbetweenFractionAbsorbedofd-GlucoseandPhenazoneinHumanRegionalPerfusionStudyDrugAbsorptionStudyinsituandinConsciousRatExtractionforLC/MS/MSAnalysisHPLCAnalysis0.2ml/minCentrifugationBloodFiltrationPerfusateInSituRatIntestinalPerfusionMesentericveinIleumAnimals:
MaleSprague-Dawleyratsweighing350-400gwereused.Perfusionsolution:
NaH2PO4(57.9mM),Na2SO4(79.6mM),pH7.5.PumpDonorBloodJugularveinPapp=DQDtAC0Basolateral(B)Apical(A)CellMonolayerBi-directionalTransportExperimentUsingCaco-2CellMonolayersandCalculationSubstratedrug(e.g.Digoxin)Apicallylocalizedeffluxtransporter(e.g.MDR1)Q/t:
Thelinearappearancerateofmassinthereceiversolution.A:
Cellmonolayersurfacearea.C0:
Theinitialconcentrationinthedonorsolution.PBtoAPAtoBRatioofPBtoA/PAtoB:
AnindicatorofeffluxactivityoftransporterincellmonolayerCorrelationbetweenOralAbsorptioninHumansandMembranePermeability(Papp)inCaco-2CellsP.Arturssonetal.,Adv.DrugDel.Rev.46:
27-43(2001)HistoryofCellCultureModelsUsedtoPredictDrugPermeationacrosstheIntestinalMucosaLate1980s-Mid1990s:
Caco-2cellsMid1990s:
Caco-2cellsvs.MDCKcellsLate1990s:
Caco-2cellsvs.MDCKcellsvs.MDCK-MDR1vs.MDCK-MRP2Caco-2CellMonolayerSystemAdvantagesCellspermitestimationof:
bothcellularuptakeanddrugtransepithelialtransportdrugtransportinthepresenceofmetabolicreactionspolarizedeffluxCellsare:
ofhumanorigin(colonadenocarcinama)viableforlongperiodsDisadvantagesRelativelong-periodoftimeforculture(3weeks)Underexpressionofkeydrug-metabolizingenzymes(e.g.,CYP3A4)Variableexpressionlevelsofeffluxtransporters(e.g.,MDR1,MRP2)PappvaluesinMDCKcellscorrelatedwellwiththoseinCaco-2cellsThecorrelationbetweenMDCKPappvaluesandhumanintestinalabsorptionissimilartotheresultsobservedwithCaco-2MDCKgrowfasterthanCaco-2(1weekvs3weeks)J.D.Irvineetal.,JPS88,28(1999)MDCKCellMonolayerSystemQuestionsConcerningMDCK-MDR1/MDCK-MRP2CellsastheModeloftheIntestinalMucosaMDR1/MRP2cDNAMDCKcellsWhencomparedwithCaco-2cells,dothesecelllines:
expressthesameprotein?
exhibitpolarizedefflux?
exhibitthesamekineticsandaffinityforsubstrates?
MDCK-MDR1/MRP2cellsExpressionofMDR1inCaco-2,MDCK-WT,andMDCK-MDR1CellsM1A1B2A2B3A3B4A4BKD250148M:
marker,A:
5gproteinB:
10gprotein.1:
Caco-2,2:
MDCK-WT,3:
MDCK-MDR1(lowpassage),4:
MDCK-MDR1(highpassage).Ref.:
Tang,F.,Horie,K,andBorchardt,R.T.(2002)AreMDCKcellstransfectedwithhumanMDR1geneagoodmodelofthehumanintestinalmucosa?
Pharm.Res.19765-772Tang,F.,Horie,K,andBorchardt,R.T.(2002)AreMDCKcellstransfectedwithhumanMRP2geneagoodmodelof