机构地区:[1]蚌埠医学院第一附属医院胃肠外科,安徽233004 [2]安徽省省立医院急救中心 [3]上海交通大学医学院附属瑞金医院消化外科研究所
出 处:《中华医学杂志》2008年第4期225-229,共5页National Medical Journal of China
基 金:安徽省卫生厅科研基金资助项目(2002A013)
摘 要:目的探讨大鼠肠缺血-再灌注损伤致肠黏膜损害的机理及乌司他丁的保护作用。方法Wiser雄性大鼠30只,随机分成假手术组(SO组)、肠缺血45min再灌注6h组(L/R组)组,乌司他丁预处理组(UTI组)。每组均为10只。用无创伤动脉夹夹闭大鼠肠系膜上动脉制成肠缺血-再灌注模型,假手术组仅无菌开腹,但不钳夹该血管。乌司他丁预处理组在术前30min经阴茎背静脉注入乌司他丁(2×10^4U/kg),而肠缺血45min再灌注6h组和假手术组则分别注入等量生理盐水。在缺血45min再灌注6h后,各组分别采集静脉血、肠系膜淋巴组织及小肠组织标本。分别观察各组血清肠脂肪酸结合蛋白(IFABP),一氧化氮(NO),肿瘤坏死因子(TNF)α水平;小肠组织丙二醛(MDA),超氧化物歧化酶(SOD),髓过氧化物酶(MPO)水平;血液及肠系膜淋巴组织细菌移位率;并对小肠组织进行光镜及电镜观察。结果和L/R组比较,UTI组IFABP,NO,TNF-α,MDA,MPO水平均明显降低,SOD活性显著升高[IFABP(520.87±75.41)pg/ml比(1493.57±136.35)pg/ml,NO(58.97±7.06)μmol/L比(95.15±9.13)μmoL/L,TNF-α(15.38±1.70)pg/ml比(23.55±4.34)pg/ml,MDA(4.5±1.1)nmol/mg比(9.2±2.6)nmol/mg,MPO(1.98±0.22)U/g比(3.02±0.55)U/g,SOD(77.08±7.14)U/mg比(60.61±6.83)U/mg,P均〈0.01]。差异具有统计学意义。肠系膜淋巴组织细菌移位率显著降低(P〈0.05),病理损害明显减轻。结论乌司他丁可能通过减少氧自由基的生成、减轻中性粒细胞聚集及活化、降低TNF-α、NO释放抑制过度炎症反应,对肠黏膜有一定的保护作用。Objective To investigate the mechanism of the injury of intestinal mucosal induced by intestinal ischemia-reperfusion and the protect effects of ulinastatin, a urinary trypsin inhibitor (UTI). Methods Thirty male Wister rats were randomly divided into three groups: sham operation (SO) group, ischemia 45 minutes and reperfusion 6 hours (I/R) group, UTI-treated group (UTI). Using clamping and then releasing the superior mesenteric artery the model of intestinal ischemia-reperfusion in rats was made. UTI group was given UTI 2 × 10^4 U/kg by administering intravenously 30 minutes before the operation, while the groups SO and I/R were intravenously injected with saline. Blood, intestinal tissue and lymph node were obtained 6 hours after reperfusion. The level of intestinal fatty acid binding protein ( IFABP), Tumor Necrosis Factor-α ( TNF-α), Nitric Oxide ( NO ), malondialdehyde ( MDA), superoxide dismutase(SOD), myeloperoxidase(MPO) and the rate of bacterial translocation (BT) in each group were examined. Intestinal tissue samples were also taken for histological analysis by light microscopy and electron microscopy. Results The content of IFABP, TNF-α, NO, MDA and MPO were significantly lower in group UTI than in group I/R [ IFABP ( 520. 87 ± 75.41 ) pg/ml vs ( 1493.57 ± 136. 35 ) pg/ml, NO (58.97 ± 7. 06 ) μmol/L vs(95. 15 ±9. 13) Fonol/L,TNF-α( 15.38 ± 1.70) pg/ml to(23.55 ± 4.34) pg/ml,MDA(4.5 ± 1.1 ) nmol/mg vs ( 9.2 ± 2. 6 ) nmol/mg, MPO ( 1.98 ± 0. 22 ) U/g vs ( 3.02 ± 0.55 ) U/g, SOD ( 77.08 ± 7. 14 ) U/mg vs (60.61 ± 6. 83 ) U/mg, P 〈 0.01 ]. There was significant difference in the rate of lymph node BT between the group UTI and I/R ( P 〈 0. 05 ). Histological changes showed that milder damage of intestinal mucosal in group UTI as to group I/R. Conclusion Intestinal ischemia-reperfusion may result in intestinal mucosal damage. Mechanism may be involved in the release of abnormal TNF-α, NO,
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...