吉法酯对三硝基苯磺酸诱导大鼠实验性结肠炎的作用

Objective To investigate the effects of Gefarnate on expression of myeloperoxidase (MPO),cyelooxygenase-1 (COX-1) and COX-2 in trinitrobenzene sulphonic acid (TNBS) induced experimental colitis in rats and its therapeutic effects on ulcerative colitis. Methods Forty female Sprague-Dawley (SD) rats were randomly divided into 4 groups with 10 each. The rats in group A, B and C were infused with TNBS/alcohol by enema. After the production of colitis, the rats in group A or B were treated daily with 1 ml of normal saline or with 1 ml of 5-ASA (100 mg/kg) by enema,and those in group C were treated daily with 1 ml of Gefarnate by gavage. Group D was served as normal control. After the production of colitis,animals were sacrificed at day 7 and 14 with 5 in each group. The macroscopic changes of the colon were evaluated according to disease activity index (DAD scoring and histological change was assessed by HE staining. MPO activity of the mucosa was detected by biochemical methods. Expressions of COX-1 and COX-2 in tissues were detected by immunohistochemistry. Results Compared with group A, macroscopic and histological scores and MPO activity were significantly decreased in group B and C (P<0.05). The expressions of COX-1 at day 7 and 14 were 1.86±0.51 and 1.96±0.41 in group B, 1.73±0.68 and 1.79±0.6 in group C, 1.91±0.34 and 1.99±0.45 in group D, respectively, which were significantly higher than those in group A (0.87±0.18 and 0.93±0.15, P<0.05). Whereas the expressions of COX-2 at day 7 and 14 were 1.53±0.19 and 0.73±0.15 in group B, 1.73±0.94 and 0.86±0.29 in group C, 0.24±0.18 and 0.18±0. 16 in group D, respectivley, which were significantly lower that those in group A (3.50±0.2;3 and 3.06±0.27). There was a significant difference between group D and group B or C (P<0.05). Conclusions Gefarnate provides a therapeutic effect during TNBS-induced colitis in rats, which is similar to that of 5-ASA. The mechanisms are involved in decreasing the concentration of colonic MPO and regulating the expression of COX-1/COX-2.     

内镜下注射硬化剂聚桂醇治疗胃血管畸形出血14例分析

目的探讨内镜下注射硬化剂聚桂醇治疗胃血管畸形的疗效。方法对14例胃血管畸形患者行急诊内镜下注射硬化剂聚桂醇(1%乙氧硬化醇)。结果急诊内镜治疗14例,止血成功12例,2例直接由内镜室转外科手术治疗,1例术后1d再出血亦转外科手术。术后4例出现上腹痛、发热等症状。止血成功的11例随访1～3月均无再出血。结论内镜下注射硬化剂聚桂醇治疗胃血管畸形有较好的疗效,但存在一定的并发症和再出血风险。     

4-氨基水杨酸对大鼠实验性结肠炎中性粒细胞趋化、活化及凋亡的影响

目的 观察4-氨基水杨酸(4-ASA)对三硝基苯磺酸(TNBS)诱导的大鼠实验性结肠炎炎症损伤、肠组织一氧化氮合酶(iNOS)表达、血中性粒细胞(PMN)凋亡及血清白细胞介素(IL)-8水平等的影响,探讨4-ASA对炎症性肠病(IBD)的治疗作用及机制.方法 40只SD大鼠分为正常对照组(n=10)和实验组(n=30),实验组建立大鼠结肠炎模型.建模第5天将实验组按照处理方式分为实验对照组(n=10,0.9%氯化钠1 ml灌肠),5-ASA组[n=10,5-ASA液(200 mg/kg)1 ml灌肠]和4-ASA组[n=10,4-ASA液(200 mg/kg)1 ml灌肠].连续治疗7 d后处死动物,取病变段肠组织,行结肠大体损伤及结肠组织学损伤评分;生化法检测髓过氧化物酶活性;免疫组化法检测肠组织iNOS表达量;流式细胞术检测血PMN凋亡率;酶联免疫吸附法检测血清IL-8浓度.结果 经4-ASA治疗7d后,4-ASA组大鼠体重明显较实验对照组增加(P<0.01,t=14.09);疾病活动指数评分、大体评分、组织学评分和MPO活性显著较实验对照组降低(t值分别=7.87、18.37、6.66和19.60,P值均<0.01).而5-ASA组与4-ASA组间上述各指标差异均无统计学意义(P值均>0.05).实验对照组肠组织iNOS表达率为(73.55±5.15)%,较正常对照组显著增加[(5.95±1.45)%,t=39.93,P<0.01)];5-ASA和4-AsA组大鼠肠组织iNOS表达率分别为(37.80±3.82)%和(42.27±3.52)%,均较实验对照组显著降低(t值分别=17.62和15.76,P值均<0.01).实验对照组血清IL-8的平均浓度明显高于正常对照组(t=25.25,P<0.01);5-ASA和4-ASA组明显低于实验对照组(t值分别=12.31和11.57,P值均<0.01).实验对照组血PMN凋亡率明显低于正常对照组(t=11.48,P<0.01);5-ASA和4-ASA组凋亡率明显高于实验对照组(t值分别=7.51和10.47,P值均<0.01).结论 4-ASA灌肠对实验性结肠炎大鼠具有显著的治疗作用,其治疗机制可能与降低PMN的趋化与激活、上调血PMN凋亡率、减少肠组织局部损伤因子有关.     

吉法酯对三硝基苯磺酸诱导大鼠实验性结肠炎的作用

目的 观察吉法酯对三硝基苯磺酸(TNBS)诱导的大鼠实验性结肠炎髓过氧化物酶(MPO)、环氧合酶(COX)-1及COX-2表达的影响,探讨吉法酯对溃疡性结肠炎的治疗作用.方法 选用雌性健康SD大鼠40只,均分为A、B、C、D组.A、B、C三组大鼠采用TNBS/乙醇灌肠制作大鼠结肠炎模型.造模后第2天,A组每天给予0.9%氯化钠溶液1 ml灌肠;B组每天给予5-氨基水杨酸(5-ASA)1 ml灌肠(100 mg/kg);C组每天给予吉法酯1 ml灌胃.D组为正常对照组.分别于造模后第7天及第14天每组处死5只大鼠,按疾病活动指数(DAI)的评分标准进行大体损伤评分,HE染色进行组织损伤评分.同时取结肠病变部位组织,生化法检测MPO活性,免疫组化法检测COX-1与COX-2的组织表达.结果 与A组比较,B组和C组的DAI评分、大体损伤形态和组织学损伤评分及MPO活性均降低(P<0.05).与A组相比,B、C、D组第7天和第14天COX-1表达水平升高(P<0.05),分别为0.87±0.18和0.93±0.15比1.86±0.51和1.96±0.41,1.73±0.68和1.79±0.6以及1.91±0.34和1.99±0.45;COX-2水平降低(P<0.05),分别为3.50±0.23和3.06±0.27比1.53±0.19和0.73±0.15,1.73±0.94和0.86±0.29,0.24±0.18和0.18±0.16.D组COX-2表达极弱,与B、C两组间差异有统计学意义(P<0.05).结论 吉法酯对TNBS诱导的大鼠结肠炎有较好的治疗作用,其疗效与5-ASA相似,其作用机制可能是降低肠组织中MPO的活性和调节COX-1/COX-2表达.     

5-ASA对TNBS结肠炎大鼠血中性粒细胞凋亡及血清IL-8水平的影响

目的:观察5-ASA对三硝基苯磺酸(TNBS)灌肠诱发的结肠炎大鼠血中性粒细胞凋亡及血清IL-8水平的影响, 并探讨5-ASA治疗炎症性肠病(IBD)的作用机制.方法:成年SD大鼠30只, ♀, 随机分成A、B、C组, A组为正常对照组, B、C组采用TNBS/乙醇灌肠制作大鼠结肠炎模型. B组每天给予生理盐水1 mL灌肠, C组每天给予5-ASA溶液(200 mg/kg)灌肠, 连续7 d. 经过处理后评定各组大鼠一般状况、结肠大体损伤及结肠组织学损伤; 在全麻下心脏采血, 分别通过流式细胞术检测血中性粒细胞凋亡率及通过酶联免疫吸附法检测血清中IL-8浓度.结果:与A组比较, B组的DAI评分、大体损伤评分和组织学损伤评分及血清IL-8水平均显著升高(2.74±0.437分vs 0.27±0.346分,5.10±1.101分vs 0.50±0.527分, 4.70±0.949分vs 0.44±0.458分, 720.97±71.718 ng/L vs129.88±18.399 ng/L, 均P<0.01), 而C组(1.34±0.385分, 1.70±0.483分, 1.50±0.850分,392.84±43.628 ng/L)明显低于B组(均P<0.01);与A组比较, B组中性粒细胞凋亡率明显降低(30.54%±4.036% vs 56.13%±5.188%,P<0.01), 而C组(48.89%±4.522%)明显高于B组( P<0.01).结论:5-ASA灌肠对结肠炎大鼠具有显著的治疗作用, 其机制可能与其降低血清IL-8水平及诱导血中性粒细胞凋亡有关.