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IL10 Antiinflammatory Signaling Pathway
IL-10isacytokinewithpotentanti-inflammatoryproperties,repressingtheexpressionofinflammatorycytokinessuchasTNF-alpha,IL-6andIL-1byactivatedmacrophages.TheIL-10receptorisintheJAK/STATclassofreceptorsbutactivationoftheJAK/STATpathwaysbyIL-10doesnotappearonitsowntoberesponsIBLefortheanti-inflammatorypropertiesofthiscytokine.Theanti-inflammatoryactionsofIL-10appeartorequireinductionoftheenzymehemeoxygenase-1(HO-1)throughamapkinasepathwayinvolvingthep38kinases.HO-1isinvolvedinthebiosynthesisofheme,andcatalyzesareactionproducingcarbonmonoxide,freeiron,andthehemeprecursorbiliverdin.HO-1isinducedbyIL-10andisalsoinducedbyoxidativestress.BlockingHO-1withinhibitorsorantisenseblockstheanti-inflammatoryactionsofIL-10.Theanti-inflammatoryactionsofHO-1appeartobetheresultofsignalingbycarbonmonoxideitproducessinceremovalofCOblockstheanti-inflammatoryactionofIL-10andHO-1.Theanti-inflammatoryactionsofIL-10maybetherapeuticallyusefuleitherdirectlyorthroughmodulationofHO-1activity.
Contributor:GlennCroston,PhD.
REFERENCES:BerlatoC,CassatellaMA,KinjyoI,GattoL,YoshimuraA,BazzoniF.Involvementofsuppressorofcytokinesignaling-3asamediatoroftheinhibitoryeffectsofIL-10onlipopolysaccharide-inducedmacrophageactivation.JImmunol.2002Jun15;168(12):6404-11.LeeTS,ChauLY.Hemeoxygenase-1mediatestheanti-inflammatoryeffectofinterleukin-10inmice.NatMed.2002Mar;8(3):240-6.OFarrellAM,LiuY,MooreKW,MuiAL.IL-10inhibitsmacrophageactivationandproliferationbydistinctsignalingmechanisms:evidenceforStat3-dependentand-independentpathways.EMBOJ.1998Feb16;17(4):1006-18.OtterbeinLE,BachFH,AlamJ,SoaresM,TaoLuH,WyskM,DavisRJ,FlavellRA,ChoiAM.Carbonmonoxidehasanti-inflammatoryeffectsinvolvingthemitogen-activatedproteinkinasepathway.NatMed.2000Apr;6(4):422-8.RileyJK,TakedaK,AkiraS,SchreiberRD.Interleukin-10receptorsignalingthroughtheJAK-STATpathway.Requirementfortwodistinctreceptor-derivedsignalsforanti-inflammatoryaction.JBiolChem.1999Jun4;274(23):16513-21.
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