《Nucleus-targeted Dmpl transgene fails to rescue denta defects in Dmpl null mice》.pdf

《Nucleus-targeted Dmpl transgene fails to rescue denta defects in Dmpl null mice》.pdf

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《Nucleus-targeted Dmpl transgene fails to rescue denta defects in Dmpl null mice》.pdf

InternationalJournalof0ralScience(2014)6.133—141 ◎2014WCSS.Allrightsreserved1674-2818/14 www.nature.com/ijos ORlGINALARTlCLE Nucleus--targeted pltransgenefailstorescuedental defectsinDmplnulImice Shu.XianLin2..QiZhang3,f,HuaZhang,KevinYan4,LeanneWards,Yong.BoLu andJian—QuanFeng , Dentinmatrixprotein1(DMP1)isessentiaItoodontogenesis.ItsmutationsinhumansubjectsleadtodentalproblemssuchasdentaI deformities。hypomineralizationandperiodontalimpairment.Primarily。DMP1isconsideredasanextracellularmatrixproteinthat promoteshydroxyapatiteformationandactivatesjntracellularsignalingpathwayviajnteractingwithavl~3jntegrin.Recentn/vitro studiessuggestedthatDMP1mightalsoactasatranscriptionfactor.Inthisstudy.weexaminedwhetherfull-lenIgthDMP1could functionasatranscriptionfactorinthenucleusandregulateOdOntOgenesisjh vo.WefirstdemonstratedthatapatientwiththeDMP1 M1Vmutation。whichpresumablycausesaIossofthesecretoryDMP1butdoesnotaffectthenucleartranslocationofDMP1,showsa typicalrachitictoothdefect.Furthermore,wegeneratedtransgenicmiceexpressing DMP1。inwhichtheendoplasmicreticulum (ER)entrysignaIsequenceofDMP1wasreplacedbyanuclearlocalizationsignaI(NLS)sequence。underthecontrolofa3.6kbrattype Icollagenpromoterplusa1.6kbintron1.Wethencrossbredthe DMP1transgenicmicewithDmpInulImicetoexpressthe NLDMP1inDmp1.deficientgeneticbaclq三round.Althoughimmunohistochemistrydemonstratedthat DMP1waslocalizedinthe nucleiofthepreodontoblastsandodontoblasts.thehistologicaI.morphologicalandbiochemicaIanalysesshowedthatitfailedto rescuethedentaIandperiodontaIdefectsaswelIasthedelayedtootheruptioninDmpInullmice.Thesedatasuggestthatthe ful1.1engthDMP1playsnoapparentroleinthenucleusduringOdOntOgenesis。 ternationalJourna/ofOralScience(2O14)6.133-

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