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NDRG2genecopynumberisnotalteredincolorectalcarcinoma

WorldJournalofClinicalOncology 页数: 8 2017-02-10
摘要: AIMToinvestigateifthedown-regulationofN-mycDownstreamRegulatedGene2(NDRG2)expressionincolorectalcarcinoma(CRC)isduetolossoftheNDRG2allele(s).METHODSThefollowingwereinvestigatedinthehumancolorectalcancercelllinesDLD-1,LoVoandSW-480:NDRG2mRNAexpressionlevelsusingquantitativereversetranscriptionpolymerasechainreaction(qRT-PCR);interactionoftheMYCgene-regulatoryproteinwiththeNDRG2promoterusingchromatinimmunoprecipitation;andNDRG2promotermethylationusingbisulfitesequencing.Furthermore,weperformedqPCRtoanalysethecopynumbersofNDRG2andMYCgenesintheabovethreecelllines,8normalcolorectaltissuesamplesand40CRCtissuesamples.RESULTSAsexpected,NDRG2mRNAlevelswerelowinthethreecolorectalcancercelllines,comparedtonormalcolon.EndogenousMYCproteininteractedwiththeNDRG2corepromoterinallthreecelllines.Inaddition,theNDRG2promoterwasheavilymethylatedinthesecelllines,suggestinganepigeneticregulatorymechanism.UnalteredgenecopynumbersofNDRG2wereobservedinthethreecelllines.Inthecolorectaltissues,onenormalandthreeCRCsamplesshowedpartialorcompletelossofoneNDRG2allele.Incontrast,theMYCgenewasamplifiedinonecelllineandinmorethan40%oftheCRCcases.CONCLUSIONOurstudysuggeststhatthereductioninNDRG2expressionobservedinCRCisduetotranscriptionalrepressionbyMYCandpromotermethylation,andisnotduetoallelicloss. ... (共8页)

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