摘要
目的 研究乌梅丸调控Kelch样ECH相关蛋白1(Keap-1)-核因子E2相关因子2(Nrf2)/血红素加氧酶1(HO-1)信号通路对葡聚糖硫酸钠(DSS)诱导的溃疡性结肠炎(UC)小鼠氧化应激损伤的抑制作用.方法 将40只C57BL/6J小鼠随机分为正常组、模型组、阳性对照组、低剂量实验组和高剂量实验组,每组8只.自由饮用2％DSS水溶液的方法复制UC模型.造模同时,正常组和模型组小鼠灌胃等体积0.9％NaCl,阳性对照组小鼠灌胃美沙拉嗪(5-ASA)溶液0.005 g·10g-1·d-1,低、高剂量实验组小鼠分别灌胃乌梅丸水煎液0.13、0.26 g·10 g-1·d-1,持续7d.评价小鼠疾病活动指数(DAI)和结肠长度变化;用实时荧光定量聚合酶链反应检测小鼠结肠组织超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、环氧酶2(COX-2)、诱导型一氧化氮合酶(iNOS)mRNA表达水平;用蛋白质印迹法检测小鼠结肠Kelch样ECH相关蛋白(Keap-1)、核因子E2相关因子2(Nrf2)、血红素加氧酶-1(HO-1)蛋白的表达水平.结果 正常组、模型组、阳性对照组和低、高剂量实验组第7天的DAI分别为0、2.62±0.33、1.87±0.35、1.87±0.35 和 1.58±0.35,结肠长度 分别为(8.16±0.47)、(5.98±0.24)、(7.58±0.38)、(7.33±0.24)和(7.48±0.51)cm,SOD mRNA 表达水平分别为 1.01±0.16、0.40±0.01、1.43±0.45、0.65±0.01 和 0.83±0.02,CAT mRNA 表 达水平 分别为 1.01±0.20、0.45±0.01、0.84±0.02、0.68±0.07 和 0.87±0.05,COX-2 mRNA 表达水平分别为 1.03±0.33、16.65±0.60、4.78±0.25、14.07±0.60 和7.39±0.15,iNOS mRNA 表达水平分别为 1.04±0.40、20.71±0.66、8.09±0.93、15.44±0.68 和11.66±0.06,Keap-1 蛋白表达水平分别为 1.22±0.16、1.10±0.05、1.18±0.05、1.94±0.08 和 1.17±0.08,Nrf2 蛋白表达水平分别为 1.12±0.16、0.76±0.15、0.65±0.13、0.70±0.16 和 0.82±0.18,HO-1 蛋白表达水平分别为1.34±0.15、1.00±0.12、0.89±0.10、1.50±0.18 和 1.40±0.13.模型组的上述指标与正常组比较,低、高剂量实验组的上述指标与模型组比较,在统计学上差异均有统计学意义(P＜0.01,P＜0.05).结论 乌梅丸对溃疡性结肠炎小鼠具有抗氧化应激损伤作用,其作用机制可能与调节结肠Keap-1-Nrf2/HO-1信号通路蛋白表达有关.
Abstract
Objective To investigate the inhibitory effects of Wumeiwan on oxidative stress injury of ulcerative colitis mice induced by dextran sulfate sodium(DSS)by regulating Kelch-like ECH related protein 1(Keap-1)-nuclear factor E2 related factor 2(Nrf2)/heme oxygenase-1(HO-1)signaling pathwayand.Methods Forty C57BL/6 mice were randomly divided into five groups:normal group,model group,positive control group,experimental-L,-H groups.UC mice model were induced by free access to 2％DSS water.Mice in normal and model group were orally administered with 0.9％NaCl,mice in positive control group were orally treated with Mesalazine solution(0.005 g·10 g-1·d-1),while mice in experimental groups were orally administered with Wumeiwan decoction at the dose of 0.13 and 0.26 g·10 g-1·d-1,respectively.All the drugs were administered for consecutive 7 days,1 times a day.The levels of disease activity index(DAI)and the colon length were scored.The levels of superoxide dismutase(SOD),catalase(CAT),cyclooxygenase-2(COX-2)and inducible nitric oxide synthase(iNOS)in colon tissue of mice were determined by real-time fluorescence quantitative polymerase chain reaction(qRT-PCR)method.The level of Keap-1,Nrf2,HO-1 proteins in colon tissue were determined by Western blot method.Results The levels of DAI of seventh day in normal group,positive control group,experimental-L,-H groups were 0、(2.62±0.33),(1.87±0.35),(1.87±0.35)and(1.58±0.35);the colon lengths were(8.16±0.47)、(5.98±0.24),(7.58±0.38),(7.33±0.24)and(7.48±0.51)cm;the SOD mRNA were 1.01±0.16、0.40±0.01,1.43±0.45,0.65±0.01 and 0.83±0.02;the CAT mRNA were 1.01±0.20、0.45±0.01,0.84±0.02,0.68±0.07 and 0.87±0.05;the COX-2 mRNA were 1.03±0.33、16.65±0.60,4.78±0.25,14.07±0.60 and 7.39±0.15;the iNOS mRNA were 1.04±0.40、20.71±0.66,8.09±0.93,15.44±0.68 and 11.66±0.06;the levels of Keap-1 were 1.22±0.16、1.10±0.05,1.18±0.05,1.94±0.08 and 1.17±0.08;the levels of Nrf2 were 1.12±0.16、0.76±0.15,0.65±0.13,0.70±0.16 and 0.82±0.18;the levels of HO-1 were 1.34±0.15、1.00±0.12,0.89±0.10,1.50±0.18 and 1.40±0.13,respectively.Significant difference was found between normal group and model group(P＜0.01,P＜0.05);significant difference was also found between the experimental-L,-H groups and model group(P＜0.01,P＜0.05).Conclusion Wumeiwan can inhibit oxidative stress in mice with UC,the mechanisms may be related to adjusted the expression of Keap-1-Nrf2/HO-1 signaling pathway protein in colon.
基金项目
甘肃省自然科学基金资助项目(20JR10RA317)
甘肃省中医药科研立项课题基金资助项目(GZK-2019-23)
甘肃省中医药研究中心开放课题基金资助项目(ZYZX-2020-20)
国家科技期刊平台
NSTL
万方数据