机构地区:[1]青岛大学医学院附属医院麻醉科,266555 [2]青岛大学医学院附属医院药剂科 [3]青岛大学医学院附属医院脑血管研究所 [4]青岛大学医学院附属医院中心实验室
出 处:《国际麻醉学与复苏杂志》2013年第3期210-215,共6页International Journal of Anesthesiology and Resuscitation
基 金:国家自然科学基金(30972855)
摘 要:目的探讨线粒体钙单向转运体(mitoehondrialcalciumuniporter,MCU)活动在大鼠脑缺血/再灌注损伤(ischemia/reperfusioninjury,I/RI)中对能量代谢的影响。方法52只雄性Wistar大鼠按照完全随机法分为对照组sham)、脑缺血,再灌注(isehemia/reperfusion,I/R)组、脑缺血,再灌注复合钌红(ischemia/reperfusion±rutheniumred,I/R±RR)组、脑缺血/再灌注复合精胺(isehemia/reperfusion±spermine,I/R±Sper)组,线栓法建立大鼠大脑中动脉闭塞模型,缺血2h,再灌注24h后检测脑梗死面积百分比,线粒体呼吸链酶复合体I~Ⅳ活性、线粒体膜电位(mitochondrialmembranepotential,△1I,m)、组织中三磷酸腺苷(adenosinetriphosphate,A1P)含量和活性氧(reac6veoxygenspecies,ROS)的含量。结果I/R组、I/R±RR组及I/R±Sper组的粒体呼吸链酶复合体I~Ⅳ的活性(17.67±0.21)、(6.17±0.42)、(22.29±1.40)、(31.73±0.84)nmol·min_1.mg,△ψm和组织中A11P的含量(5.2±60.19)nmol/mgprotein均低于sham组(P〈0.01),而这3组的脑梗死面积百分比(35.43±0.74)%和ROS含量(1455.21±39.52)U/mgprotein高于对照组(P〈0.01)。钌红能够改善上述指标:与I,R组比较,I/R±RR组中的钌红能够明显提高线粒体呼吸链酶复合体的活性(22.1±70.55)、(7.50±0.15)、(36.92±2,13)、(49.32±1.33)nmol·min_1.mg2,△mm和组织中ATP的含量(7.85±0.17)nmol/mgprotein(P〈0.01),明显缩小梗死面积(26.00±1.71)%,降低ROS的含量(1262.53±29.92)U/mgprotein(P〈0.01);而I/R±Sper组中的能量代谢指标则均较脑I/R组差。结论抑制MCU的活动可以明显改善I/RI中线粒体的能量代谢。Objective To study the effect of mitochondrial calcium uniporter (MCU) activity on mitochondrial energy metabolism in cerebral ischemia/reperfusion injury (I/RI) in rats. Methods Fifty-two male rats were randomly divided into four groups : control group (sham), ischemia/reperfusion group (I/R), ischemia/reperfusion ruthenium red group (I/R±RR) and ischemia/ reperfusion ±spermine group (I/R±Sper). The MCAO rats were generated by thread embolism of middle cerebral artery. Ischemia was induced for 2 h followed by 24 h of reperfusion, cerebral infarction area percentage, mitochondrial complex activity,mitochondrial membrane potential (AWm), intracellular adenosine triphosphate (ATP) level and reactive oxygen species (ROS) content were determined after reperfusion. Results Mitochondrial complex I -IV activity [(17.67±0.21),(6.17±0.42),(22.29±1.40),(31.73± 0.84) nmol· min·l·mg-l, Am and intracellular ATP level (5.2±60.19) nmol/mg protein were decreased in I/R group, I/R±RR group and I/R±Sper group compared with control group(P〈0.0I ),but cerebral infarction area percentage(35.43±0.74)% and ROS content( 1 455.21±39.52) U/mg protein were increased in the three groups (P〈0.01). Ruthenium red treatment could improve the parameters above: compared with those in isehemia/reperfusion group, ruthenium red in ruthenium red group obviously enhanced mitochondrial complex activity [(22.1 ±70.55), (7.50 ±0.15), (36.92±2.13), (49.32 ±1.33) nmol ·min-1 ·mg-1 Am and intraeellular ATP level (7.85±0.17) nmol/mg protein (P〈0.01),with reducing cerebral infarction area (26.00±1.71)%, and decreasing ROS content( 1 262.53~29.92) U/mg protein(P〈0.01 ). While all the parameters deteriorated in spermine group comparedwith those in I/R group. Conclusions Inhibition of the activity of MCU can obviously improve mitochondrial energy metabolism during cerebral URI.
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