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ID:21451070
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页数:9页
时间:2018-10-22
《浅议mitokatp通道开放对离体兔心缺血再灌注损伤的保护功能》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、浅议mitoKATP通道开放对离体兔心缺血再灌注损伤的保护功能【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功能,并探索可能的保护机制。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-HDPinacidil组(HP组)、5-HDDiazoxide组(HD组)。离体兔心4℃标准St.Thomas停搏液(K16mmol/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
2、观察Pinacidil、Diazoxide及其和5-HD适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活性均明显高于C组,心肌酶、MDA的含量明显低于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通道共同参和对心肌缺血再灌注损伤的保护功能,其中mitoKATP通道起主导功能。【mito
3、KATP通道;缺血再灌注损伤;离体家兔;心脏【AbstractObjectiveToinvestigatetheprotectiveeffectsofdifferentATP-sensitivepotassium(KATP)channelopens,PinacidilandDiazoxide,onmyocardiuminjuryinisolatedrabbitheartscausedbyischemia/reperfusionandpossiblechangesafterapplicationofATP-sensitivepotassiumchann
4、elblocker,5-HD.MethodsObservationadeonrabbitheartsperfusedlydividedintofourselectedgroups:1.Pinacidil;2.Diazoxide;3.5-HDPinacidil;4.5-HDDiazoxide.Allgroupsinutesocclusion,thenfolloinutesreperfusionascardiacstoppedfunctioningbycoldcardioplegia.AnyoneofPinacidil,Diazoxide,Pinacid
5、ilorDiazoxidemixedinutesbeforecardioplegicheartrestedinexperimentalgroup.Hemodynamicsvariables,levelsofadeninenucleotidesandlipidperoxideofthemyocardiumeasured.Results(1)InGroupP,GroupDandGroupHP,therecoveryofmyocardialcontractilityandheartrateyocardiumandhadmuchloyocardialaden
6、osinetriphosphate(ATP)(P<0.05or0.01)uchhigher.(2)InGroupHP,hoyocardialcontractilityandheartratecouldnotbeasgoodasGroupP,MDAlevelofmyocardiumandreleaseamountofalbumenchannelopenesmayenhancemyocardialprotectionagainstischmia/reperfusioninjury.Theaboveeffectofmyocardialprotectionc
7、hannelblocker:5-HD.TheseresultsshoacologicalagentsimplicatemitochondriaandsarcolemmalKATPchannelsarenotimportantinischemiccardioprotection.【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
8、通道)。随着对KATP通道深进的探究发现KATP通道是将细胞代谢和细胞电活动耦联起来,从而调节细胞功能(如胰
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