机构地区:[1]江苏大学附属人民医院泌尿外科,镇江212002
出 处:《中华实验外科杂志》2017年第10期1651-1654,共4页Chinese Journal of Experimental Surgery
基 金:镇江市社会发展计划项目(SH2015080)
摘 要:目的探讨脂氧素A4(LXA4)在大鼠肾缺血再灌注(I/R)诱发肾损伤中的内源性保护作用及机制。 方法清洁级成年雄性SD大鼠24只,按照随机数字表法分为4组(n=6):假手术组(Sham组)、肾缺血再灌注组(I/R组)、LXA4预处理组(LXA4组)和脂氧素A4受体(ALXR)抑制剂Boc-2预处理组(Boc-2组)。采用切除右肾后短暂夹闭左肾肾动脉的方法建立肾I/R损伤模型。Sham组仅切除右肾;I/R组切除右肾后,短暂夹闭左肾肾动脉再灌注;LXA4组分别在肾I/R前12、24、36 h经尾静脉注射LXA4(200 μg/kg);Boc-2组分别在肾I/R前12、24、36 h经尾静脉注射Boc-2(100 mg/kg),6 h后再经尾静脉注射LXA4(200 μg/kg)。在I/R后24 h时检测静脉血肌酐(Scr)和尿素氮(BUN)、肾皮质超氧化物歧化酶(SOD)和丙二醛(MDA)的水平;Western blot检测凋亡相关因子活化半胱氨酰天冬氨酸特异性蛋白酶-3(cleaved Caspase-3)和B细胞淋巴瘤/白血病-2(bcl-2)以及线粒体损伤相关蛋白线粒体融合蛋白2(Mfn2)、电压依赖性阴离子通道1(VDAC1)和细胞色素C(cytochrome C)的表达变化。结果与Sham组比较,I/R组Scr[(57.67±5.43) μmol/L]、BUN[(18.16±2.61) mmol/L]、SOD[(6.06±1.13) U/mgprot]升高(P=0.000),MDA[(50.51±5.91) nmol/mgprot]降低(P=0.000);cleaved Caspase-3(1.80±0.19)和cytochrome C(1.55±0.28)表达上调(P=0.000),bcl-2(0.70±0.07)、Mfn2(0.82±0.17)和VDAC1(0.81±0.09)表达下调(P=0.000)。与I/R组比较,LXA4组Scr[(39.01±4.81) μmol/L,P=0.000]、BUN[(10.47±2.79) mmol/L,P=0.000]和SOD[(3.65±0.83) U/mgprot,P=0.003]降低,MDA[(70.60±8.46) nmol/mgprot]升高(P=0.000);cleaved Caspase-3(1.08±0.12,P=0.000)和cytochrome C(1.01±0.21,P=0.002)表达下调,bcl-2(1.21±0.12,P=0.000)、Mfn2(1.15±0.17,P=0.02)和VDAC1(1.09±0.13,P=0.001�ObjectiveTo evaluate the relationship between Lipoxin A4 (LXA4) and the endogenous protection mechanism of acute kidney injury induced by renal ischemia reperfusion (I/R) injury in rats.MethodsTwenty-four pathogen-free male SD rats were randomly divided into 4 groups (n=6 each): sham group, renal I/R injury group, LXA4 group and LXA4 receptor inhibitor Boc-2 group. Renal I/R injury model was established by excising the right kidney and transiently clamping the left renal artery. In sham group, only right kidney was removed. In I/R group, the right kidney was removed and the left renal artery was transiently clamped. In LXA4 group, LXA4 (200 μg/kg) was injected via the tail vein respectively at 36, 24 and 12 h before renal I/R. In Boc-2 group, Boc-2 (100 mg/kg) was injected via the tail vein respectively at 36, 24 and 12 h before renal I/R, and then LXA4 (200 μg/kg) was injected 6 h after each Boc-2 administration. At 24 h after reperfusion, the serum creatinine (Scr) and blood urea nitrogen (BUN), superoxide dismutase (SOD) and malondialdehyde (MDA) in the renal cortex were measured, and the expression of cleaved cysteinyl aspartate-specific protease (Caspase)-3, B cell lymphoma/leukemia-2 (bcl-2), mitofusin 2 (Mfn2), voltage dependent anion channel 1 (VDAC1) and cytochrome C was detected by Western blotting. ResultsCompared with sham group, Scr [(57.67±5.43) μmol/L], BUN [(18.16±2.61) mmol/L] and SOD [(6.06±1.13) U/mgprot] was increased (P=0.000), while MDA [(50.51±5.91) nmol/mgprot] was decreased (P=0.000) in renal cortex, expression of cleaved caspase-3 (1.80±0.19) and cytochrome C (1.55±0.28) was up-regulated (P=0.000), while expression of bcl-2 (0.70±0.07), Mfn2 (0.82±0.17)and VDAC1 (0.81±0.09) was down-regulated (P=0.000) in I/R group. Compared with I/R injury group, Scr [(39.01±4.81) μmol/L, P=0.000], BUN [(10.47±2.79) mmol/L, P=0.000] and SOD [(3.65±0.83) U/mgprot, P=0
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