二氧化硫对大鼠离体灌注心脏心功能的影响  被引量:10

Effects of sulfur dioxide on cardiac function of isolated perfusion heart of rat

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作  者:张素清[1] 杜军保[1] 田悦[1] 耿彬[3] 唐朝枢[3] 汤秀英[2] 

机构地区:[1]北京大学第一医院儿科,100034 [2]北京大学第一医院电镜室,100034 [3]北京大学医学部生理与生理病理学系

出  处:《中华医学杂志》2008年第12期830-834,共5页National Medical Journal of China

基  金:国家自然科学基金资助项目(30630031、30571971、30425010);国家重点基础研究发展计划基金资助项目(2006CB503807);教育部长江学者奖励计划基金资助项目(985-2-087-111)

摘  要:目的观察二氧化硫(SO2)对大鼠离体心脏心功能的影响及可能的机制。方法应用Langendorff大鼠离体心脏灌流模型,以不同浓度SO2供体(Na2SO3/NaHSO3)(1、10、100、1000μmol/L)或0.5μmol/L天冬氨酸异羟肟酸(HDX)灌流心脏5min,并以生理浓度SO2供体(Na2SO3/NaHSO3)(10μmol/L)持续灌流20min,测量心率、左心室内压差(左心室收缩末压一舒张末压)、左心室内压变化速率(±dp/dtmax)以及冠脉流量;应用钙离子通道阻断剂尼卡地平预灌流后再给予生理剂量SO2供体(Na2SO3/NaHSO3)灌注,观察尼卡地平是否可以阻断SO2的心脏效应。结果SO2呈浓度依赖性地抑制左心室±dp/dtmax、左心室内压差、心率以及冠脉流量(均P〈0.01);生理剂量SO2供体(Na2SO3/NaHSO3)持续灌流20min,灌流20min时,左心室内压差,+dp/dtmax、-dp/dtmax及心率分别为:(15±3)mmHg(1mmHg=0.133kPa),(485±74)mmHs/s,(339±64)mmHg/s,(114±26)次/min;均明显低于灌流5min时的左心室内压差[(23±7)mmHg]、+do/dtmax[(595±93)mmHg/s]、-dp/dtmax[(436±83)mmHg/s]及心率[(159±31)次/min],均P〈0.05;0.5μmol/L HDX灌注后左心室内压差降低,左心室±dp/dtmax减少、冠脉流量减少(P〈0.05或P〈0.01);尼卡地平可阻断生理剂量SO2对心功能的抑制效应。结论外源性SO2对大鼠离体心脏的心功能具有负性肌力作用,其作用机理与电压门控钙通道有关。Objective To observe the effects of sulfur dioxide (SO2) on cardiac function of isolated perfused heart of rat and to explore the physiological regulation of endogenous SO2 on myocardial action. Methods The hearts of 64 Wistar rats were isolated, perfused with Krebs-Henseleit (KH) solution through Langendorff apparatus, and randomly divided into 8 equal groups : Four groups underwent perfusion of SO2 of the concentrations 1,10,100,1000 μmol/L respectively for 5 min and then perfused with KH solution for 15 min. Eight hearts underwent perfusion of SO2 of the physiological concentration ( 10 μmol/L) for 20 min. The control group underwent perfusion of KH solution for 20 min. Eight hearts of the nicardipine group underwent perfusion of nicardipine, a L-type calcium channel blocker, 2.5 μmol/L for 5 min, SO2 10 μmol/L for 5 min, and then KH solution for 10 min. The heart in the hydroxamate (HDX) group underwent perfusion of HDX, an inhibitor of SO2 endogenous generating enzymes, for 5 rain, and then perfused by KH solution for 15 min. The heart rate ( HR), difference of left ventricular pressure ( LVP), left ventricular peak rate of contraction ( + dp/dtmax) , peak rate of relaxation ( - dp/dtmax) , and coronary flow (CF) were measured. Then transmission electron microscopy was conducted. Results SO2 concentrationdependently inhibited the left ventricular + dp/dtmax, LVP, HR, and CF ( all P 〈 0. 01 ). The left ventricular + dp/dtmax, LVP, and HR were inhibited ( P 〈 0.05 ) by the physiological concentration ( 10 μmoi/L) SO2 donor continuous perfusion for 20 min. During perfusion 20 min, the LVP, + dp/dtmax, - dp/dtmax, and HR after perfusion for 20 min of the physiological concentration ( 10 μmol/L) SO2 donor continuous perfusion group were (15 ±3) mm Hg, (485 ±74) mm Hg/s, (339 ±64) mm Hg/s, and (114 ± 26)/min respectively, all significantly lower than those 5 min after perfusion [ (23 ± 7 ) mm Hg,(595±93)mm Hg/s,

关 键 词:二氧化硫 心脏功能试验 钙离子通道 

分 类 号:R686[医药卫生—骨科学]

 

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