甲状腺素对成年期甲状腺功能减退症大鼠背侧海马snap 25表达的影响-effect of thyroxine on snap 25 expression in dorsal hippocampus of adult hypothyroidism rats.docxVIP
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甲状腺素对成年期甲状腺功能减退症大鼠背侧海马snap 25表达的影响-effect of thyroxine on snap 25 expression in dorsal hippocampus of adult hypothyroidism rats
结果1.体重变化造模前各组大鼠体重无统计学差异(F(3,42)=0.21,P=0.93)。造模结束后,正常对照组大鼠体重增加49.0%,而甲减组、T4-5组、T4-20组分别增加21.5%、32.5%和26.1%(与正常对照组比较,Ps0.05)。2.血清T3、T4水平与正常对照组相比,甲减组大鼠血清T3、T4水平显著降低,分别为对照组的53.6%、77.5%(Ps0.02);小剂量替代治疗组大鼠血清T3、T4恢复至正常对照组水平;大剂量替代治疗组大鼠血清T3、T4显著高于小剂量替代治疗组和正常对照组(Ps0.001)。3.SNAP-25蛋白在各组大鼠海马CA1、CA3和DG区各层内表达量的变化免疫组化检测显示:SNAP-25的免疫反应产物在四组大鼠海马CA1、CA3和DG区内的分布相似,阳性颗粒(棕黄色)在各区的每一层均有分布,但密度不同。量化分析结果显示:甲减组大鼠海马CA1、CA3和DG区各层内SNAP-25蛋白表达水平较正常对照组显著增多(Ps0.039);予大、小剂量甲状腺激素替代治疗后,SNAP-25的蛋白表达水平在CA1、CA3和DG区各层内与正常对照组比较均无统计学差异(Ps0.458和Ps0.078),但与甲减组比较,小剂量替代治疗组大鼠海马CA3放射层、DG区分子层和门区角回以及大剂量替代治疗组大鼠海马CA1、CA3和DG区各层内SNAP-25表达水平均显著降低(Ps0.048)。结论1.成年期甲减大鼠背侧海马的SNAP-25蛋白表达增加。2.甲状腺素替代治疗能使升高的SNAP-25蛋白水平恢复,且大剂量甲状腺激素恢复效果好。关键词甲状腺功能减退症左旋甲状腺素SNAP-25海马ABSTRACTEffectofThyroxineonSNAP-25ExpressioninDorsalHippocampusofAdult-onsetHypothyroidRatsObjectiveThehypothyroidratswereinducedbydailyintraperitonealinjectionof6-n-propyl-2-thiouracil(PTU)1mg/100gbodyweight.TheexpressionofSNAP-25(synaptosomal-associatedproteinof25kDa)inhippocampusofadultonsethypothyroidismratsandtheeffectofLevothyroxin(L-T4)treatmentweredetectedbyimmunohistochemistry.Furthertoexplorethemolecularmechanismofbrainimpairmentbyhypothyroidism.MethodsAdultmaleSprague-Dawleyratsweighing250~300gwereusedincurrentexperiments.Fouty-fiveratsweredividedinto4groupsrandomlyasindicatedbelow:(1)Hypothyroidgroup.TwelvehypothyroidratswereinducedbydailyintraperitonealinjectionofPTU(dissolvedinsalinesolution,1mg/100gbodyweight(BW))forsixweeks;(2)T4-5group.ElevenratsweretreatedwithPTUforsixweeksasdescribedabove.Butfromthefifthweek,theywerealsotreatedwithintraperitoneallyinjectedL-T4(dissolvedinsalinesolution,50μg/kgBW)everydayfortwoweeks;(3)T4-20group.ElevenratsweretreatedaccordingtothesameprotocolsastheT4-5groupexceptincreasingthedosageofL-T4to200μg/kgBW.(4)Controlgroup.Elevencontrolratsweregivensamevolumeofsalinesolutionforsixweekswithhypothyroidrats.TheradioimmunoassaykitswereappliedtoassaythelevelsofserumT3andT4,andimmunohistochemicalmethodwasusedtodeterminethelevelofSN
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