脂氧素A4对缺血再灌注大鼠心肌组织Na+-K+-ATP酶的影响及意义  被引量:2

The influence and significance of LXA4 on myocardial Na+ -K+ -ATP enzyme in rats undergoing ischemia reperfusion injury

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作  者:赵琦峰[1] 杜杰[1] 邵兰[1] 夏杰[1] 胡型锑[1] 金胜威[1] 

机构地区:[1]温州医科大学附属二院,育英儿童医院,省立育英医院,325027

出  处:《中华小儿外科杂志》2013年第11期848-853,共6页Chinese Journal of Pediatric Surgery

基  金:浙江省教育厅科研计划项目,浙江省外科学重中之重学科开放基金资助,浙江省卫生厅重点支撑学科-小儿外科学基金

摘  要:目的探讨大鼠心肌缺血再灌注损伤(MIRI)前、后使用脂氧素A4(LXA4)对心肌组织Na^+-K^+-ATP酶的影响及意义。方法72只SD大鼠随机分成假手术一组(C1组)、假手术二组(C2组)、MIRI一组(I/R1组)、MIRI二组(I/R2组)、MIRI前用药组(LX,组)、MIRI后用药组(LX2组),每组12只。建立大鼠MIRI模型,各组于开胸前取血(T1)、实验结束后取血(T2)测血清cTnI浓度。检测Na^+-K^+-ATP酶蛋白、mRNA的表达及活性改变;同时检测心肌细胞凋亡率,测定SOD活性、MDA含量,电镜下观察各组超微结构的改变。结果I/R1、LX1与C1相比,I/R2、LX2与C2相比,Na^+-K^+-ATP酶蛋白(α1:0.19±0.03,0.29±0.05比0.46±0.06,0.21±0.03,0.36±0.05比0.48±0.07,α2:0.20±0.02,0.32±0.04比0.54±0.05,0.23±0.03,0.38±0.04比0.56±0.06,α3:0.24±0.03,0.35±0.04比0.61±0.04,0.26±0.03,0.4l±0.04比0.59±o.04,β1:0.22±o.03,0.33±0.04比0.56±0.04,0.24±0.03,0.39±0.04比0.54±0.04),mRNA的表达下降[(0.21±0.07)×10^6,(0.55±0.28)×10^6比(5.73±1.97)×10^6,(0.20±0.09)×10^6,(1.78±0.86)×10^6比(6.21±2.22)×10^6],活性(mmol/gprot)降低(0.73±0.04,0.95±0.11比1.38±0.15,0.75±0.04,1.19±0.12比1.37±0.13);血清cTnI浓度(ng/L)(T2)(580.93±43.92,292.95±21.99比151.53±14.00,592.80±60.83,207.13±28.54比155.18±14.92),凋亡指数(52.52±6.36,34.55±5.65比7.48±2.09,54.75±6.29,26.53±4.60比8.54±2.76)以及SOD活性(U/mgprot)(196.84±31.82,293.59±43.10比102.55±24.77,202.48±35.40,411.71±60.44比113.36±26.95)、MDA含量(nmol/gprot)(2402.94±438.56,1548.57±238.08比472.48±190.77,2422�Objective To investigate the influence and significance of LipoxinA4 (LXA4) on myocardial Na+ -K+ -ATP enzyme in rats undergoing ischemia reperfusion injury. Methods Seventy- two SD rats were randomly divided into six groups (n = 12) : sham operation group one (group C1 ) sham operation group two (group Ca); MIRI group one (group I/R1 ); MIRI group two (group I/ R2 ) ; pre-MIRI treatment group one (group LX1 ) ; post-MIRI treatment group two (group LX2 ). The rat model of MINI was established, the serum cTnI concentrations were measured in each group before chest opening (T1) and at the end of the experiment (T2). The expression and activity change of Na+-K+ -ATP enzyme protein, mRNA were detected. At the same time, myocardial cell apoptosis was detected with TUNEL method, the SOD activation and MDA content were checked, while the ultrastructural changes of cardiac muscle were observed under electron microscope. Results In group I/R1, LX1 (compared with group C1 ) and group I/R2, LX2 (compared with group C2 ), the expression levels of Na+ -K+ -ATP protein (α1: 0. 19 ± 0. 03, 0. 29 ± 0. 05 to 0. 46 ± 0. 06, 0. 21 ± 0. 03,0. 36 ± 0.05 to 0. 48 ± 0. 07 , α2 : 0. 20 ± 0. 02 , 0. 32 ± 0. 04 to 0.54±0.05,0.23±0.03,0.38±0.04 to 0.56± 0. 06,α3:0. 24 ± 0. 03,0. 35 ± 0. 04 to 0. 61 ± 0. 04,0. 26 ± 0. 03,0. 41 ± 0. 04 to 0. 59 ± 0. 04,β1:0. 22 ± 0. 03,0. 33 ± 0. 04 to 0. 56 ± 0. 04,0. 24 ± 0. 03,0. 39 ± 0. 04 to 0. 54 ± 0. 04) and mRNA( (0. 21 ± 0. 07) ×10^6,(0.55±0.28)×110to (5.73±1.97) ×10^6,(0.20±0.09) ×10^6,(1.78±0.86) ×10^6 to (6.21 ± 2. 22) ×10^6 ). The activities of Na± -K± -ATP (mmol/gprot) were decreased respectively. Serum cTnI concentrations (T2), the apoptotic index and SOD activation (U/mgprot), MDA content(nmol/ gprot) all increased significantly (P〈0. 05). In group LX1 (compared with group I/R1 ) and group LX2 (compared with group I/R2 ),

关 键 词:心肌再灌注损伤 脂氧素类 NA(+)K(+)交换ATP酶 细胞凋亡 

分 类 号:R542.2[医药卫生—心血管疾病]

 

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