辣蓼提取物对大鼠急性胃黏膜损伤的保护作用研究

摘要

OBJECTIVE:To study the protective effects of Polygonum hydropiper extract on acute gastric mucosal lesion (AGML)in rats. METHODS:48 rats were randomly divided into normal group(normal saline),model group(normal saline), positive group(ranitidine hydrochloride,0.05 g/kg),P. hydropiper extract low-dose,medium-dose and high-dose groups(2.7, 8.1,24.3 g/kg by crude drug),i.g. for consecutive 7 d,once a day. Except for normal group,other groups were given absolute ethyl alcohol to induce AGMI model after 1 h of last administration. 1.5 h after modeling,gastric mucosal lesion index of rats was calculated;the pathological changes of gastric tissue in rats were observed;nuclear factor E2 related factor 2(Nrf2)content and SOD activity in gastric tissue of rats were determined by ELISA. RESULTS:Compared with normal group,the gastric mucosa of model group was damaged obviously,there was blood capillary rupture in submucosa,gastric mucosal lesion index was increased significantly(P<0.01);Nrf2 content and SOD activity were significantly decreased in gastric tissue of rats(P<0.05 or P<0.01). Compared with model group,gastric mucosal lesion of rats was relieved to different extent;in positive group,P. hydropiper extract medium-dose and high-dose groups,gastric mucosal lesion index was decreased significantly(P<0.05),and Nrf2 content and SOD activity were increased significantly(P<0.05 or P<0.01). CONCLUSIONS:P. hydropiper extract has good protective effect on absolute ethyl alcohol-induce AGMI,the mechanism of which may be associated with raising Nrf2 content and enhancing SOD activity in gastric mucosal tissue.%目的:研究辣蓼提取物对大鼠急性胃黏膜损伤(AGML)的保护作用.方法:将48只大鼠随机分为正常组(生理盐水)、模型组(生理盐水)、阳性组(盐酸雷尼替丁,0.05 g/kg)和辣蓼提取物低、中、高剂量组(以生药量计分别为2.7、8.1、24.3 g/kg),连续灌胃给药7 d,每天1次.末次给药1 h后,除正常组外,其余各组大鼠均灌胃无水乙醇复制AGML模型.造模1.5 h后,计算各组大鼠胃黏膜损伤指数,观察大鼠胃组织病理学变化,采用酶联免疫吸附法测定大鼠胃组织中核因子E2相关因子2(Nrf2)含量和超氧化物歧化酶(SOD)活性.结果:与正常组比较,模型组大鼠胃黏膜损伤明显,黏膜下层毛细血管破裂出血,胃黏膜损伤指数显著升高(P<0.01);胃组织中Nrf2含量和SOD活性显著降低(P<0.05或P<0.01).与模型组比较,各给药组大鼠胃黏膜的损伤均不同程度减轻;阳性组和辣蓼提取物中、高剂量组大鼠胃黏膜损伤指数显著降低(P<0.05),胃组织中Nrf2含量和SOD活性显著升高(P<0.05或P<0.01).结论:辣蓼提取物对无水乙醇致大鼠AGML具有较好的保护作用,其机制可能与提高胃黏膜组织中Nrf2含量和增强SOD活性有关.