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ID:25155350
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页数:11页
时间:2018-11-18
《mitokatp通道开放对离体兔心缺血再灌注损伤的保护作用》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、mitoKATP通道开放对离体兔心缺血再灌注损伤的保护作用【摘要】目的观察不同类型ATP敏感性钾通道开放对高钾停跳离体兔心缺血再灌注损伤的保护作用,并探讨可能的保护机制。方法采用离体兔心Langendorff灌注实验模型,离体兔心40只随机等分成五组(n=8):对照组(C组)、Pinacidil组(P组)、Diazoxide组(D组)、5-HD+Pinacidil组(HP组)、5-HD+Diazoxide组(HD组)。离体兔心4℃标准St.Thomas停搏液(K+16mmol/L)至心脏停跳,45min后再灌注20min,药物于心脏停跳前灌注15min。对比观察Pinacidil、Dia
2、zoxide及其与5-HD合用时心脏的功能指标、冠脉血流量以及再灌注末心肌组织中腺苷酸含量、丙二醛(MDA)含量、超氧化物歧化酶(SOD)活性和心肌酶的变化。结果P组、D组、HP组再灌注后复跳时间、心功能的恢复率、心肌能量保存、SOD活性均显著高于C组,心肌酶、MDA的含量显著低于C组,HP组心功能的恢复、能量保存差于P组,心肌酶、MDA的含量高于P组。结论肌纤维膜型(sarcKATP通道)和线粒体型(mitoKATP通道)KATP通道共同参与对心肌缺血再灌注损伤的保护作用,其中mitoKATP通道起主导作用。【关键词】mitoKATP通道;缺血再灌注损伤;离体家兔;心脏【Abstrac
3、t】ObjectiveToinvestigatetheprotectiveeffectsofdifferentATP-sensitivepotassium(KATP)channelopens,PinacidilandDiazoxide,onmyocardiuminjuryinisolatedrabbitheartscausedbyischemia/reperfusionandpossiblechangesafterapplicationofATP-sensitivepotassiumchannelblocker,5-HD.MethodsObservationadeonrabbithear
4、tsperfusedlydividedintofourselectedgroups:1.Pinacidil;2.Diazoxide;3.5-HD+Pinacidil;4.5-HD+Diazoxide.Allgroupsinutesocclusion,thenfolloinutesreperfusionascardiacstoppedfunctioningbycoldcardioplegia.AnyoneofPinacidil,Diazoxide,PinacidilorDiazoxidemixedinutesbeforecardioplegicheartrestedinexperiment
5、algroup.Hemodynamicsvariables,levelsofadeninenucleotidesandlipidperoxideofthemyocardiumeasured.Results(1)InGroupP,GroupDandGroupHP,therecoveryofmyocardialcontractilityandheartrateyocardiumandhadmuchloyocardialadenosinetriphosphate(ATP)(P<0.05or0.01)uchhigher.(2)InGroupHP,hoyocardialcontractilitya
6、ndheartratecouldnotbeasgoodasGroupP,MDAlevelofmyocardiumandreleaseamountofalbumenchannelopenesmayenhancemyocardialprotectionagainstischmia/reperfusioninjury.Theaboveeffectofmyocardialprotectionchannelblocker:5-HD.TheseresultsshoacologicalagentsimplicatemitochondriaandsarcolemmalKATPchannelsarenot
7、importantinischemiccardioprotection.【KeyitochondrialATPsensitivepotassiumchannel;ischemia/reperfusioninjury;isolatedrabbit;hearts1983年,Noma[1]应用膜片钳技术首先在豚鼠心肌细胞上发现ATP敏感性钾通道(KATP通道)。随着对KATP通道深入的研究发现KATP通道是将细胞代谢和细胞电活动耦联起来,
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