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ID:10444181
大小:67.00 KB
页数:9页
时间:2018-07-06
《心肌enos表达和no的改变对糖尿病大鼠缺血再灌注损伤的影响》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、心肌eNOS表达和NO的改变对糖尿病大鼠缺血再灌注损伤的影响【摘要】测定不同周期链脲佐菌素(STZ)诱导糖尿病大鼠心肌eNOS表达、NO变化及其对缺血/再灌注(I/R)损伤的影响。【方法】阻断和开放左冠状动脉前降支建立大鼠急性心肌I/R模型,用TTC染色,测定大鼠心肌I/R后梗死面积;免疫印迹分析测定心肌eNOS表达;形态测定(Morphometric)法测定硝基酪氨酸(Nitrotyrosine,NT)的水平;用硝酸还原酶法测定NO含量。【结果】在STZ处理后2周,糖尿病组(2WD)心肌梗死面积比相应周期对照组(2WC)明显缩小,STZ处理后16周(16WD)
2、,梗死面积比相应对照组(16WC)增加;内皮一氧化氮合酶(eNOS)在心肌的表达在2WD比2WC组增加34%,然而在16WD比16WC明显减少;超氧亚硝酸根离子(Peroxynitrite,ONOO-)生成的标志性产物硝基酪氨酸(nitrotyrosine,NT)在2WD组中较2WC组低约49%,但在16WD组中较16WC组显著增加;血一氧化氮(Nitricoxide,NO)水平2WD组中较2WC组增高,但是16WD组较16WC组显著减少。【结论】STZ诱导糖尿病早期、晚期对心肌I/R损伤呈现相反的作用。这可能是由于早、晚期糖尿病相反的心肌eNOS表达及NO改变
3、而引起的。【关键词】糖尿病心肌缺血再灌注内皮一氧化氮合酶一氧化氮硝基酪氨酸 Abstract:【Objective】Todeterminetheeffectsofdifferent-termSTZ-induceddiabetesonischemia/reperfusion(I/R)injuryofmyocardialandtodetermineifI/Rinjuryisrelatedtodiabetes-inducedalterationsineNOSexpressionandnitricoxide(NO)Levels.【Methods】Themodelsof
4、I/Rinjurywereinducedbyocclusionandreperfusionoftheleftdescendingcoronaryartery(LDCA)ofrats.SizeofI/R-inducedinfarctwasdeterminedusingtriphenyltetrazoliumchloride(TTC)staining;eNOSexpressionwasquantifiedbyWesternblotanalysis;Nitrotyrosinelevelswasquantifiedbymorphometricanalysis;NOpro
5、ductionwasquantifiedbyGriessreagentreaction.【Result】TwoweeksafterSTZtreatment,infarctsizewasdecreasedinthe2weeksdiabetichearts(2WD)ascomparedwithtime-matchedcontrolgroup(2WC);Whereasafter16weeksofdiabetes(16WD),theinfarctsizewasincreasedinthediabeticheartsascomparedwiththe16WCgroup.e
6、NOSexpressionintheheartwasincreasedin2WDgroupby34%over2WCvalues;whereastherewasdecreasedineNOSexpressionin16WDover16WCgroups.Peroxynitriteformationasindicatedbynitrotyrosinewas49%lowerin2WDhearts,butwasincreasedin16WDgroupcomparedwithcontrols.PlasmaNOlevelswereincreasedin2WDrats;wher
7、easNOlevelsaremarkedlydecreasedin16WDgroupcomparedwithtime-matchedcontrols.【Conclusion】Short-andlong-termSTZinduceddiabetesexertoppositeinfluencesonmyocardialI/Rinjury,andthesecontradictoryinfluencesmaydependondifferentalterationsineNOSexpressionandNOlevels. Keywords:Diabetes;Myocar
8、dial;Ischemi
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