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1、β-连环蛋白和腺瘤性结肠息肉病蛋白在小鼠牙胚发育中的表达及相互关系的研究【摘要】目的观察β-连环蛋白(β-catenin)和腺瘤性结肠息肉病(APC)蛋白在胎鼠下颌第一磨牙牙胚中的表达,探讨两者的作用及相互关系。方法将昆明小鼠按雌雄比2∶1合笼,发现阴栓视为妊娠,定为E0.5d,制作E13.5d、E14.5d、E15.5d、E16.5d、E17.5d胎鼠下颌第一磨牙石蜡切片,免疫组化SP法检测β-catenin和APC蛋白的表达与分布。结果β-catenin在牙胚蕾状期、帽状期、钟状期上皮内均有表达,且随着发育的成熟,其表达逐渐增强,着色于
2、细胞膜、质及核。APC蛋白在蕾状期牙蕾上皮呈强阳性表达,随着牙胚发育其表达逐渐减弱,着色在细胞膜、质。β-catenin与APC蛋白有显著的负相关性(P<0.01)。结论β-catenin表达于牙胚早期细胞核及细胞质内,提示其参与了牙胚早期的细胞增殖过程。β-catenin与APC蛋白的时空表达有重叠现象,并呈显著负相关,这符合WNT经典信号通路中两者的作用关系。【关键词】β-连环蛋白;腺瘤性结肠息肉病蛋白;牙胚;免疫组化Expressionofβ-cateninandadenomatouspolyposiscoliprotein
3、andcorrelationbetweentheminthedevelopmentofmousetoothgermJIANGRui-zhong,ZHUEn-xin,LIUTing-jiao.(Dept.ofStomatology,JiaozuoHealthSchool,Jiaozuo454100,China;Dept.ofOralPathology,CollegeofStomatology,DalianMedicalUniversity,Dalian116044,China)[Abstract]ObjectiveToexaminethedi
4、stributionsofβ-cateninandadenomatouspolyposiscoli(APC)proteininthetoothgerm,andobtainthemessagesoffunctionofthetwofactorsandtherelationshipbetweenthem.MethodsMicewereselectedandcohabitedwiththeratiooffemalemicetomaleonesbeing2∶1,andEmbryoday0.5wasconfirmedbasedonthefi
5、ndingofvaginalplug.Thedistributionsofβ-cateninandAPCproteinintheEmbryosonday13.5,14.5,15.5,16.5,17.5wereexaminedintheparaffin-embeddedsectionsbyimmunohistochemistrymethods.ResultsDuringE13.5dtoE17.5d,positiveexpressionofβ-cateninwasfoundintheoralepitheliumandthed
6、entallamina,andbecamemoreandmorestrong.Thestainingwerewholecell.Duringthebudstage,strongpositiveexpressionofAPCproteinwasfoundintheoralepitheliumandthedentallamina,buttheexpressiondisplayedadown-regulationtendency.Thestainingwasthecytomembraneandcytoplasm.Therewasnegativec
7、orrelationbetweenβ-cateninandAPCprotein(P<0.01).ConclusionTheresultofβ-cateninsuggestsitscontributionintheearlydevelopmentofenamelorganandtheproliferationofcell.Coincidanceofthetwofactorsstainingsitewasfound,accordingtothestatistics.[Keywords]β-catenin;adeno
8、matouspolyposiscoliprotein;toothgerm;immunohistochemistry牙胚的发生是口腔牙源性上皮与间充质相互诱导的结果,在其发生过程中