乌司他丁对脓毒症大鼠肺脏的保护作用

目的 观察乌司他丁(Ulinastatin)对脓毒症大鼠肺脏的保护作用,并从细胞凋亡的角度分析其可能的作用机制.方法 40只雌性SD大鼠随机(随机数字法)分为对照组及治疗组(乌司他丁30万U/kg)各20只.以经典盲肠结扎穿孔法(CLP)成功制作脓毒症大鼠模型,并在术后脓毒症的症状出现时(术后3 h),治疗组按设计剂量经腹腔给药,而对照组给于同等量的PBS溶液.用药后12 h取两组大鼠肺组织通过透射电子显微镜观察其超微结构变化,并通过免疫组织化学技术法检测凋亡相关蛋白Bcl-2及Bax在肺组织内的表达情况,用图片分析软件(Image-pro plus,IPP)检测Bcl-2及Bax累积光密度值(IOD),并计算Bcl-2/Bax比值.结果 透射电子显微镜观察对照组大鼠肺组织,可见肺泡壁明显充血水肿、肺泡腔萎陷缩小,腔内大量渗出液等炎症改变,而治疗组(30万U/kg)大鼠肺组织充血、渗出等改变减轻.免疫组织化学检测结果提示抑凋亡蛋白Bcl-2在对照组与治疗组大鼠肺组织内表达的差异具有统计学意义(P＜0.01),且治疗组表达高于对照组;而促凋亡蛋白Bax的表达在对照组较治疗组高,差异具有统计学意义(P＜0.01);Bcl-2/Bax 比值结果提示治疗组比值高于对照组,差异有统计学意义(P＜0.05).结论 乌司他丁对脓毒症大鼠的肺组织有明确的保护作用,可能通过抑制炎症反应的同时也抑制细胞的凋亡而发挥作用.

Abstract：

Objective To investigate the prottective effect of ulinstatin on lung of rats with sepsis and its mechanism of ameliorating cell apoptosis. Method A total of 40 female SD rats were randomly (random number)divided into the control group and the therapy group (ulinastatin 300 000 u/kg). The rat models of sepsis were produced by the classical method of cecal ligature and puncture (CLP), and the designed doses ulinastatin were given intra-peritoneally to the rats of the ulinastatin group and the same amounts of PBS (phosphate buffered solution) instead of ulinastatin were administered intra-peritoneally to the rats of the control group when the sepsis symptoms appeared usually in 3 hours after modeling. In 12 hours after treatment, lung tissues of rats in two groups were taken for observation under the transmission electron microscopy and detecting the levels of Bcl-2 and Bax protein in lung tissues by using immunohistochemical technique. The levels of the integrated optical density(IOD)of Bcl-2 and Bax protein were detected by using Image-pro plus software and the ratio of Bcl-2/Bax was calculated. Results Transmission electron microscope showed that lung tissue in control group had inflmmatory changes such as severe congestion and consolidation, and those changes in ulinastatin treatment group (300 000 u/kg)were significantly slighter. There were significant differences in the levels of antiapoptotic protein Bcl-2 in lung tissue of rats between two groups(P＜0.01), and the level of protein Bcl-2 in ulinas tatin group were higher than those in control group. The level of pro-apoptotic protein Bax in control group were higher than that in ulinastatin group (P＜0.01). The ratio of Bcl-2/Bax in ulinas tatin group was higher than that in control group (P ＜ 0.05).Conclusions Ulinastatin has protective effect on lung tissue in septic rats, and it may inhibit the inflammatory response and in the same time plays a role in inhibiting cell apoptosis.

The protective effect of Ulinastatin on lung tissue in septic rats

Objective To investigate the prottective effect of ulinstatin on lung of rats with sepsis and its mechanism of ameliorating cell apoptosis. Method A total of 40 female SD rats were randomly (random number)divided into the control group and the therapy group (ulinastatin 300 000 u/kg). The rat models of sepsis were produced by the classical method of cecal ligature and puncture (CLP), and the designed doses ulinastatin were given intra-peritoneally to the rats of the ulinastatin group and the same amounts of PBS (phosphate buffered solution) instead of ulinastatin were administered intra-peritoneally to the rats of the control group when the sepsis symptoms appeared usually in 3 hours after modeling. In 12 hours after treatment, lung tissues of rats in two groups were taken for observation under the transmission electron microscopy and detecting the levels of Bcl-2 and Bax protein in lung tissues by using immunohistochemical technique. The levels of the integrated optical density(IOD)of Bcl-2 and Bax protein were detected by using Image-pro plus software and the ratio of Bcl-2/Bax was calculated. Results Transmission electron microscope showed that lung tissue in control group had inflmmatory changes such as severe congestion and consolidation, and those changes in ulinastatin treatment group (300 000 u/kg)were significantly slighter. There were significant differences in the levels of antiapoptotic protein Bcl-2 in lung tissue of rats between two groups(P＜0.01), and the level of protein Bcl-2 in ulinas tatin group were higher than those in control group. The level of pro-apoptotic protein Bax in control group were higher than that in ulinastatin group (P＜0.01). The ratio of Bcl-2/Bax in ulinas tatin group was higher than that in control group (P ＜ 0.05).Conclusions Ulinastatin has protective effect on lung tissue in septic rats, and it may inhibit the inflammatory response and in the same time plays a role in inhibiting cell apoptosis.