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1、6溶酶体酶B抑制剂CA-074Me对病毒性心肌炎小鼠心肌保护作用的研究张新刚1赵刚1李双杰2李高平1陈瑞珍1杨英珍11复旦大学医学院附属中山医院,上海市心血管病研究所,上海,2000322湖南省南华大学附属第一医院,湖南衡阳,421001摘要目的:观察溶酶体酶B(CathepsinB)抑制剂CA-074Me对病毒性心肌炎小鼠的干预作用,并探讨其对心肌保护的作用机制。方法:55只4周龄雄性BALB/c小鼠随机分为对照组(N组,n=10)、病毒模型组(V组,n=15)、低剂量干预组(L组,n=15)
2、及高剂量干预组(H组,n=15)。后3组经腹腔接种柯萨奇病毒B3(CVB3)成功诱发急性病毒性心肌炎,L组和H组于病毒接种后第2天分别腹腔注射CA-074Me0.4mg/kg和4mg/kg,均连续用7d(第2~8天),第15天处死全部存活小鼠,并采血检测血清cTnI以及收集小鼠心脏标本作组织学检测。结果:小鼠感染CVB3后,其心肌组织中CathepsinB蛋白表达水平及血清cTnI明显增加;经CA-074Me干预后,CathepsinB表达以及cTnI降低,心肌损害减轻,小鼠生存率升高,尤其以H
3、组最明显。结论:CA-074Me通过抑制CathepsinB的表达,减轻心肌损害、提高感染小鼠的存活率,起到保护性的作用,并且对心肌细胞的保护存在明显的量效关系,可为今后临床治疗病毒性心肌炎的研究提供参考。关键词CathepsinB;CA-074Me;病毒性心肌炎;心肌肌钙蛋白-IEffectofCathepsinBInhibitorCA-074MeontheModelofMiceViralMyocarditisZHANGXingang1YuXiaohua2ZHAOGang1LIShuangji
4、e2,LIGaoping,CHENRuizhen,YANGYingzhenShanghaiInstituteofCardiovascularDiseases,ZhongshanHospitalFudanUniversity,Shanghai,200032,China2TheFirstHospitalAttachedtoNanhuaUniversityinHunanProvince,Hengyang421001,ChinaAbstractObjective:Toobservetheinterven
5、tioneffectofCA-074Meonthemodelofmouseviralmyocarditis,andtoexplorethepossiblemechanismofitsprotectiononmyocardium.Methods:Atotalof55male4-week-oldBABL/cmicewererandomlydividedinto4groups:normalcontrolgroup(groupN,n=10),viralmyocarditisgroup(groupV,n=
6、15),CVB3infectedandlowdoseCA-074Metreatedgroup(groupL,n=15)andCVB3infectedandhighdoseCA074Metreatedgroup(groupH,n=15).Everymouseintheexperimentalgroupwasgiven0.1mlcoxsackieB3virusintraperitoneally.Atthesametime,0.1mlofnormalsalinewastreatedingroupN.F
7、romday2today8,0.4mg/kgand4mg/kgCa-074MeweregivenintraperitoneallyperdayingroupLandHmicerespectively.Onday15theserumwascollectedtodetectcardiactroponinI(cTnI),thenallofmiceweresacrificedandheartswereremovedforhistologicstudyonday15.Results:Thecathepsi
8、nBexpressionallevelsandserumcTnIlevelswere基金项目:国家自然科学基金资助项目(NO:30271665)通讯作者陈瑞珍:chen.ruizhen@zs-hospital.sh.cn66increasedremarkablyafterCVB3inoculation.IneachofCA-074Metreatmentgroups,cTnIlevelsweremarkedlydecreased,meanwhile,themyocardialdamagewasat