腹腔注射去甲肾上腺素小鼠心肌组织形态学、容积调节性氯离子通道蛋白3表达变化及其意义
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腹腔注射去甲肾上腺素小鼠心肌组织形态学㊁容积调节性氯离子通道蛋白3表达变化及其意义
陈梦青1ꎬ黄丹1ꎬ2ꎬ孙宇1ꎬ汪帅1ꎬ李春梅1
(1广东药科大学ꎬ广州510006ꎻ2湖南中医药高等专科学校)
㊀㊀摘要:目的㊀
观察腹腔注射去甲肾上腺素(NE)小鼠心肌组织形态学㊁容积调节性氯离子通道蛋白3(ClC ̄3)
表达变化ꎬ并探讨其意义ꎮ方法㊀将C57BL/6小鼠分为NE组㊁酚妥拉明(Phe)+NE组㊁对照组ꎻNE组每天腹腔注射NE(2mg/kg)ꎻPhe+NE组每天先腹腔注射Phe(8mg/kg)ꎬ2h后再腹腔注射NE(2mg/kg)ꎻ对照组每天腹腔注射等量生理盐水ꎮ所有药物连续注射7d后ꎬ测算各组小鼠心脏指数并观察心肌组织形态学变化ꎬReal ̄timePCR法检测各组小鼠心肌组织中ClC ̄3和心房钠尿肽(ANF)mRNAꎬWesternblotting法检测各组小鼠心肌组织中ClC ̄3蛋白ꎮ结果㊀NE组㊁Phe+NE组㊁对照组小鼠心脏指数分别为5.22ʃ0.46㊁4.80ʃ0.23㊁4.61ʃ0.25ꎬNE组与Phe+NE组㊁对照组相比ꎬP均<0.05ꎻNE组小鼠心肌细胞和心肌肌束排列异常ꎬ心肌细胞及细胞核异常肥大㊁变形ꎬ细
胞核聚集ꎬ出现明显的心脏重构㊁心肌细胞增大现象ꎮNE组㊁Phe+NE组㊁对照组小鼠心肌组织中ClC ̄3mRNA的相对表达量分别为0.50ʃ0.10㊁1.16ʃ0.38㊁1.00ʃ0.00ꎬANFmRNA的相对表达量分别为2.95ʃ1.78㊁1.96ʃ0.75㊁1.00ʃ0.00ꎬClC ̄3蛋白的相对表达量分别为0.46ʃ0.02㊁0.68ʃ0.02㊁0.69ʃ0.04ꎬNE组与Phe+NE组㊁对照组相比ꎬP均<0.05ꎮ结论㊀NE可诱导小鼠心肌肥厚ꎬ其机制可能与其抑制ClC ̄3mRNA和蛋白的表达有关ꎮ㊀㊀关键词:心肌肥厚ꎻ去甲肾上腺素ꎻ氯离子通道ꎻ容积调节性氯离子通道蛋白3ꎻ酚妥拉明㊀㊀doi:10.3969/j.issn.1002 ̄266X.2019.12.011
㊀㊀中图分类号:R541㊀㊀文献标志码:A㊀㊀文章编号:1002 ̄266X(2019)12 ̄0041 ̄03
基金项目:国家自然科学基金资助项目(31500926)ꎻ广东省自然科学基金资助项目(2014A030310023)ꎮ通信作者:李春梅(E ̄mail:gylichunmei@126.com)
Changesandsignificanceofmyocardialhistomorphologyandexpressionofvolume ̄regulatedchloridechannelprotein3inmiceinjectedwithnorepinephrineintraperitoneallyCHENMengqing1ꎬHUANGDanꎬSUNYuꎬWANGShuaiꎬLIChunmei(1GuangdongPharmaceuticalUniversityꎬGuangzhou510006ꎬChina)
㊀㊀Abstract:Objective㊀Toobservethechangesandthesignificanceofmyocardialhistomorphologyandexpressionofvol ̄ume ̄regulatedchloridechannelprotein3(ClC ̄3)inmiceinjectedwithnorepinephrine(NE)byintraperitonealinjection.Methods㊀C57BL/6miceweredividedintotheNEgroupꎬphentolamine(Phe)+NEgroupꎬandcontrolgroup.MiceintheNEgroupwereinjectedwithNE(2mg/kg)intraperitoneallydailyꎬmiceinthePhe+NEgroupwereinjectedwithPhe(8mg/kg)dailyꎬ2hourslaterꎬwithNEꎻmiceinthecontrolgroupweregivenintraperitonealinjectionofthesameamountofnormalsalineperday.After7daysofcontinuousinjectionofalldrugsꎬthecardiacindexandmyocardialmorphologicalchangesweremeas ̄ured.ClC ̄3andatrialnatriureticpeptide(ANF)weredetectedbyreal ̄timePCRꎬandWesternblottingwasusedtodetectClC ̄
3proteininthemyocardiaofmiceineachgroup.Results㊀ThecardiacindexesoftheNEgroupꎬPhe+NEgroupandcontrol
groupwere5.22ʃ0.46ꎬ4.80ʃ0.23and4.61ʃ0.25ꎬrespectivelyꎻsignificantdifferencewasfoundbetweenthePhe+NEgroupandcontrolgroup(P<0.05).IntheNEgroupꎬthemyocardialcellsandmyocardialmusclebundleswereabnormallyarrangedꎬ
thecardiomyocytesandnucleuswereabnormallyhypertrophiedanddeformedꎬandthenucleuswasaggregatedꎬandobviouscar ̄diacremodelingandmyocardialcellenlargementoccurred.TherelativeexpressionlevelsofClC ̄3mRNAinthemyocardialtis ̄
suesofNEgroupꎬPhe+NEgroupandcontrolgroupwere0.50ʃ0.10ꎬ1.16ʃ0.38and1.00ʃ0.00ꎬrespectively.Therelative
expressionlevelsofANFmRNAwere2.95ʃ1.78ꎬ1.96ʃ0.75ꎬand1.00ʃ0.00ꎬandtherelativeexpressionlevelsofClC ̄3proteinwere0.46ʃ0.02ꎬ0.68ʃ0.02ꎬand0.69ʃ0.04ꎬrespectivelyꎻsignificantdifferenceswerefoundbetweenthePhe+NE
groupandcontrolgroup(allP<0.05).Conclusion㊀NEcaninducemyocardialhypertrophyinmiceꎬanditsmechanismmayberelatedtoitsinhibitionofClC ̄3mRNAandproteinexpression.
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4山东医药2019年第59卷第12期