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1、壬基酚对P450arom及MIS基因表达影响摘要:[目的]研究壬基酚(p-nonylphenol,NP)对细胞色素P450芳香化酶基因(P450arom)和苗勒氏管抑制物基因(MIS)表达的影响,探索其对鱼类雌激素样作用的分子机制。[方法]日本比目鱼在性分化过程中能随环境因子改变而发育为不同性别,在幼鱼孵化后第30天到第100天性分化敏感期于27℃水温下,给予幼鱼投食NP100μg/g饲料。分别对各组比目鱼生殖腺做病理组织切片,判断其性别和雌雄比例,并通过原位杂交方法结合RT-PCR分析第100天青年期鱼生殖腺中P450arom和MISmRNA的表达,观察NP对比目鱼性分化标志基因的作用。[
2、结果]NP对27℃水温饲养下的比目鱼幼鱼有一定程度的雌性化诱导作用,成年雌性的百分比为30%,高于27℃水温对照组(0%);比目鱼幼鱼出生后第100天时对其生殖腺进行原位杂交分析显示,P450arom的mRNA在各组的雌鱼卵巢中有明显表达,但在雄鱼精巢中未见表达;而MIS的mRNA在各组的雌鱼卵巢中不表达,却在雄鱼精巢中能见到很明显的表达。RT-PCR分析也显示,P450芳香化酶的mRNA仅仅在雌鱼卵巢中表达,而MIS也仅仅在雄鱼精巢中表达,证实了原位杂交实验的结果。[结论]13在日本比目鱼体内,NP染毒可以诱导P450芳香化酶mRNA表达并抑制MIS的mRNA的表达,从而对生殖腺性分化期的
3、幼鱼发挥雌激素样干扰作用。关键词:壬基酚;芳香化酶P450;苗勒氏管抑制物;雌激素样作用中图分类号:R114,R99文献标识码:AEffectsofp-nonylphenolontheexpressionofP450aromandMISgenesYANGJun1,2,ZHONGWei-jian�2,ADACHIRyuta�3,KITANOTakeshi�3,ABEShin-ichi�3(1.SchoolofPublicHealth,FudanUniversity,Shanghai200032,China;2.ShanghaiMunicipalCenterforDiseaseControlan
4、dPrevention,Shanghai200336,China;3.DepartmentofMaterialsandLifeScience,GraduateSchoolofScienceandTechnology,KumamotoUniversity,Kumamoto860-8555,Japan)Abstract:[Objective]Toelucidatetheeffectofp-nonylphenol(NP)oncytochromeP450aromatase(P450arom)geneandMüllerianinhibitingsubstance(MIS)geneinfishgonad
5、,exploringthemechanismofitsestrogenicaction.[Methods]TreatmentwithNPtoJapaneseflounder,ateleostthatexhibitstemperature-dependentsexdetermination,wascarriedoutbyprovidingthelarvaewithanartificialdietmixedwith100μg/gofNPata13masculinizingtemperature(27℃)from30to100daysafterhatching.Phenotypicsexwasde
6、terminedat100(juvenilestage)and300dah(adultstage)byhistologicalobservation.Sexratio,P450aromandMISmRNAsexpressioninthegeneticallyfemalefloundertreatedwithNPwereexaminedbyinsituhybridizationandRT-PCRanalyses.[Results]Treatmentwith100μg/gdietofNPinducedfeminizationoftheflounderlarvaerearedat27℃withfe
7、malepercentagesof30%.TheresultofinsituhybridizationandRT-PCRanalysesshowedthatfeminizationofthelarvaebyNPwasaccompaniedbyup-regulationofP450arommRNAexpressionanddown-regulationofMISmRNAexpressioninfemalegon