简介：Objective:Fusogenicendogenousretroviralsyncytinplaysanimportantroleintheformationofsyncytiotrophoblastsinhumanplacenta.Apartfromitsexpressioninplacenta,brainandtestis,syncytinhasalsobeenfoundinmanycancers.Althoughsyncytinhasbeenproposedtoserveasapositiveprognosticmarkerinsomecancers,theunderlyingmechanismisunclear.Theaimofthisstudyistoevaluatetheeffectsofsyncytinexpressionontheinvasivephenotypeofmelanomacells.Methods:Theeukaryoticexpressionplasmidforsyncytin-EGFPwasconstructedandtransfectedintoB16F10melanomacells.TheeffectofsyncytinontheinvasionpotentialoftumorcellswasevaluatedinB16F10sublinecellsthatstablyexpressedsyncytin-EGFPfusionproteinorEGFPalone.Results:TheB16F10sublinesthatstablyexpressedsyncytin-EGFPorEGFPalonewereestablishedrespectivelyandconfirmedbyimmunofluorescentandimmunoblottingassay.SyncytinexpressioninB16F10cellswasassociatedwithdecreasedcellproliferation,migrationandinvasion.Multinucleatedgiantcellsthatcontainedasmanyasfivenucleiwereinducedinsyncytin-expressingcells.Inaddition,syncytinexpressiondidnotalterthesensitivityofB16F10cellstotrichosanthin,atoxinthatdamagessyncytiotrophoblastsmoreefficientlythanothertissues.Conclusions:Theseresultssuggestthatsyncytinexpressioninsomecancersmayconfinetheirinvasionpotentialandthusserveasapositiveprognosticfactor.更多还原