[Abstract]Objectives : Inthisstudy,weinvestigatedtheimmunomodulatoryandantioxidanteffectofMOK, apharmacopuncturemedicine,inconcanavalinA(ConA)-stimulatedmousesplenocytes. Methods : PrimarysplenocyteswereisolatedfromICRmice.Thesplenocytesweretreatedwith MOKextract(1.25,2.5,5,10,and20mg/mL)for30minandthenstimulatedwithConA(200 ng/mL)fortheindicatedtimes.CellviabilityofthesplenocyteswasmeasuredusinganMTT assay.ThemRNAexpressionofTh1/Th2cytokines(IFN-γ,IL-4,IL-10,andFoxp3)andantioxidantenzymes(HO-1andMnSOD)wasmeasuredbyRT-PCR. Results : AdditionofMOKextractat2.5,5,and10mg/mLinConA-stimulatedsplenocytessignificantlydecreasedtheproductionofIFN-γandsignificantlyincreasedtheexpressionofIL-4,IL-10,andFoxp3mRNA.MOKextractalsoincreasedthemRNAexpressionofHO-1and MnSODinsplenocytes.