简介：Galα(1,3)Gal(galepitope)isacarbohydrateepitopeandsynthesizedinlargeamountbyα(1,3)galactosyltransferase[α(1,3)GT]enzymeonthecellsoflowermammaliananimalssuchaspigsandmice.Humanhasnogalepitopeduetotheinactivationofα(1,3)GTgenebutproducesalargeamountofantibodies(anti-Gal)whichrecognizeGalα(1,3)Galstructuresspecifically.Inthisstudy,areplicationdeficientrecombinantadenoviralvectorAd5sGTcontainingpigα(1,3)GTcDNAwasconstructedandcharacterized.Adenoviralvector-mediatedtransferofpigα(1,3)GTgeneintohumantumorcellssuchasmalignantmelanomaA375,stomachcancerSGC-7901,andlungcancerSPC-A-1wasreportedforthefirsttime.ResultsshowedthatGalepitopedidnotincreasethesensitivityofhumantumorcellstohumancomplement-mediatedlysis,althoughhumancomplementactivationandthebindingofhumanIgGandIgMnaturalantibodiestohumantumorcellswereenhancedsignificantlyafterAd5sGTtransduction.AppearanceofgalepitopeonthehumantumorcellschangedtheexpressionofcellsurfacecarbohydratesreactingwithUlexeuropaeusI(UEAI)lectins,Viciavillosaagglutinin(VVA),Arachishypogaeaagglutinin(PNA),andGlycinemaxagglutinin(SBA)todifferentdegrees.Inaddition,noeffectofgalepitopeonthegrowthinvitroofhumantumorcellswasobservedinMTTassay.