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
ResultsBodyweightgainAtthebeginningofthestudy,bodyweightsoftheanimalswerenotsignificantlydifferent(F(3,42)=0.21,P=0.93).Thenormalgrowthofbodyweightinthecontrolswasincreasedby49.0%atthetimeoftheexperiment.However,bodyweightgaininHypothyroid,T4-5andT4-20groupsincreasedonlyby21.5%,32.5%and26.1%,respectively,overthesameperiodoftime,whichissignificantlylowerthanthecontrols(Ps0.05).ThyroidhormonelevelsTheaveragelevelsofserumT3andT4weresignificantlylowintheHypothyroidgroup(Ps0.02),buthighintheT4-20group(Ps0.001)comparingwiththeControlgroup,theaveragelevelsofserumT3andT4intheT4-5groupissimilartotheControlgroup.ProteinlevelofSNAP-25intheexaminedlayersofCA1,CA3andDGsubfieldsofhippocampusTheimmunoreactivitydistributionsofSNAP-25wassimilaramongthesegroups.PunctatespotsofreactionproductdistributedineverylayerofCA1,CA3andDGsubregions.Theopticaldensity(OD)valueofSNAP-25immunoreactivityineachstratumofhippocampalsubfieldswasalsoanalyzed.WefoundthattheODvaluesweresignificantlyhighinHypothyroidgroup(Ps0.039)andsimilartocontrolsinT4-5andT4-20groupinallsubareasofCA1,CA3,andDG.WhencomparedtoHypothyroidgroup,theODvaluesweresignificantlylowinCA3-SR,DG-PLandDG-MLinT4-5group,aswellasinallexaminedlayersinT4-20group(Ps0.048).ConclusionTheseresultssuggestthatadult-onsethypothyroidismcausedup-regulationofSNAP-25levelindorsalhippocampus,whichcouldberestoredbyT4treatment,andtherecoverydegreeisrelatedtotheT4dosage.KeywordsHypothyroidism/Levothyroxine(L-T4)/SNAP-25/Hippocampus英文缩略词表英文缩写英文全称中文全称PTUPropylthiouracil丙基硫氧嘧啶T3Triiodothyronine三碘甲状腺原氨酸T4Tetraiodothyronine四碘甲状腺原氨酸L-T4L-thyroxine左旋甲状腺素FT3Freetriiodothyronine游离三碘甲状腺原氨酸TT3Totaltriiodothyronine总三碘甲状腺原氨酸TT4Totaltetraiodothyronine总四碘甲状腺原氨酸HypoHypothyroidism甲状腺功能减退症SNAP-25Synaptosomal-associatedproteinof25KDa突触小体相关蛋白-25KDaSyt1Synaptotagmin1突触结合蛋白-1CA1CornuAmmonis1CA1区DGDentategyrus齿状回SVsSnapticvesicles突触囊泡CACornuammonis海马角1THTRT-BBPLDCVsAODLTPLTDSTPThyroidhormoneThyroxinereceptorThyroxin-bindingprealbiminLargedensecorevesiclesAverageopticaldensityL
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