简介：AIM:Toobservethereversaleffectsofwide-typep53geneonmulti-drugresistanceto5-FU(LOVO/5-FU).METHODS:AftertreatmentwithAd-p53,LOVO/5-FUsensitivityto5-Fuwasinvestigatedusingtetrazoliumdyeassay.Multidrugresistancegene-1(MDR1)geneexpressionwasassayedbysemi-quantitativereversetranscriptionpolymerasechainreactionandtheexpressionofp53proteinwasexaminedbyWesternblotting.RESULTS:Thereversalactivityaftertreatmentwithwidetypep53genewasincreasedupto4.982foldat48h.TheexpressionofMDR1genedecreasedsignificantlyaftertreatmentwithwide-typep53gene,andtheexpressionofp53proteinlastedforabout5d,withapeakat48h,andbegantodecreaseat72h.CONCLUSION:Wide-typep53genehasaremarkablereversalactivityforthehighexpressionofMDR1geneincolorectalcancers.Thereversaleffectsseemtobeinatimedependentmanner.Itmighthavegoodprospectsinclinicalapplication.