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时间:2018-11-18
《缺血后处理对高血脂大鼠缺血再灌注心肌bcl2及bax蛋白表达的影响》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、缺血后处理对高血脂大鼠缺血再灌注心肌Bcl2及Bax蛋白表达的影响作者:霍玉娥尹博英刘胜辉【摘要】目的观察缺血后处理对高血脂大鼠缺血再灌注心肌Bcl2及Bax蛋白表达的影响。方法选择高血脂SD大鼠36只,随机分为3组:假手术组、缺血再灌注组、缺血后处理组,每组12只。制备大鼠心肌缺血再灌注模型。缺血再灌注组:收紧结扎线缺血40min,放松结扎线再灌注240min;缺血后处理组:缺血40min后,再灌注10s,缺血10s,连续3个循环,然后再灌注240min;假手术组:开胸后穿线做套环,但不收紧结
2、扎线。再灌注结束后自右颈动脉采血测定血清肌酸激酶(CK)活性,用TUNEL法检测再灌注心肌凋亡程度,采用免疫组织化学方法检测Bcl2及Bax蛋白的表达情况。结果①血清中CK活性的测定:再灌注结束后缺血后处理组和缺血再灌注组CK活性明显高于假手术组〔分别为(789.68±67.34),(932.86±84.17),(252.48±19.78)U/L,P<0.05〕,缺血后处理组明显低于缺血再灌注组(P<0.05)。②心肌凋亡细胞计数:再灌注结束后假手术组未见明显细胞凋亡(<5%),
3、缺血后处理组心肌细胞凋亡率明显低于缺血再灌注组〔分别为(11.9±2.7)%,(21.2±3.5)%,P<0.05〕。③与缺血再灌注组相比,缺血后处理组Bcl2蛋白表达增加(P<0.05),Bax蛋白表达减低(P<0.05)。结论缺血后处理可以增加高血脂大鼠缺血再灌注心肌Bcl2蛋白表达、降低Bax蛋白表达,进而抑制凋亡。【关键词】再灌注损伤;缺血后处理;凋亡 【Abstract】ObjectiveTostudytheeffectofischemicpostcondition
4、ingonexpressionofBcl2andBaxprotEininhyperlipemiaratsyocardialischemiareperfusion.Methods36hyperlipemiaSDratslydividedinto3groups:shamoperation,ischemicreperfusionandischemicpostconditioninggroups(n=12),andratsadeintoMIRmodels.Ratsintheischemicreperfus
5、iongroupinutesischemia,andthenreperfusedfor240min.Ratsinischemicpostconditioninggroupinutesischemia,reperfusedfor10sand10sischemiafor3cycles,andthenreperfusedreperfussedfor240min.Ratsinshamoperationgroupyocytesmunohistochemistrycreatinekinase(CK)activi
6、tyeasured.Results①DeterminationofserumCKactivity:iticpostconditioninggroupandischemicreperfusiongroupafterreperfusionthanthatoftheshamoperationgroup〔(789.68±67.34),(932.86±84.17),(252.48±19.78)U/Lrespectively,P<0.05〕,anditicpostconditioninggroupthan
7、thatintheischemicreperfusiongroup(P<0.05).②Numberofapoptoticmyocardialcells:thereoperationgroup(<5%),andtheapoptoticrateintheischemicpostconditioninggrouparkablyloicreperfusiongroup〔(11.9±2.7)%,(21.2±3.5)%respectively,P<0.05〕.③Theexpressionof
8、Bcl2proteinicpostconditioninggroupthanthatintheischemicreperfusiongroup(P<0.05).TheexpressionofBaxproteinicpostconditioninggroupthanthatintheischemicreperfusiongroup(P<0.05).ConclusionsIschemicpostconditioningmayincreasetheexpres
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