枸杞多糖及其复方对链脲佐菌素所致糖尿病大鼠胰岛功能的保护效应

背景:目前,西药治疗糖尿病主要着眼于刺激已受损的胰岛β细胞加强分泌胰岛素,在保护受损的β细胞这方面,中药治疗尤为重要。目的:观察枸杞多糖及其养阴活血复方对链脲佐菌素诱导的糖尿病大鼠胰岛功能的保护作用。设计:随机对照动物实验。单位:河南科技大学第一附属医院,医学院。材料:Wistar雄性大鼠70只,6周龄,体质量200g左右。方法:实验于自2001-10/2002-04在河南科技大学动物房进行。70只大鼠分为两组,第1组10只,为正常对照组,第2组60只,为造模组,造模成功共30只,数字表法随机分为3组:链脲佐菌素模型组和复方治疗组、枸杞多糖治疗组各10只;每天9:00复方治疗组灌胃自拟益气养阴活血中药复方(黄芪、山药、葛根各30g,枸杞子、丹参、花粉、地骨皮各15g,当归、知母各12g,丹皮、五味子各10g,水蛭5g,山萸肉20g,等,中药由河南科技大学第一附属医院药房提供,按常规煎后浓缩至相当于生药3.0kg/L)60g/kg,枸杞多糖治疗组灌胃枸杞多糖(由本室从宁夏枸杞子中分离、纯化得到)0.5g/kg,链脲佐菌素模型组和正常组灌胃相当体积的生理盐水,共3周。测定各组在实验3周前后的空腹血糖和胰岛素,并计算胰岛β细胞功能指数;取胰脏检测超氧化物歧化酶、一氧化氮合酶活性和一氧化氮、丙二醛浓度。主要观察指标:正常组、链脲佐菌素组、复方组和枸杞多糖组治疗3周前后的空腹血糖、空腹胰岛素和胰岛β细胞功能指数;各组治疗后胰脏超氧化物歧化酶、一氧化氮合酶活性和一氧化氮、丙二醛浓度。结果:实验大鼠正常组10只,模型组入选造模成功者30只,最终进入结果分析40只。①实验初,与正常对照组比较,各模型组空腹血糖均明显升高(t=16.51～10.07,P<0.01),而空腹胰岛素水平和β细胞功能指数明显下降(t=13.64～100.99,P<0.01).②实验3周后,复方治疗组、枸杞多糖组与链脲佐菌素模型组比较,空腹血糖、一氧化氮、丙二醛浓度、一氧化氮合酶活性明显下降(t=8.08～72.68,P<0.01),而空腹胰岛素水平和β细胞功能指数、超氧化物歧化酶活性明显上升(t=4.39～17.87,P<0.05～0.01)。③复方治疗组的空腹血糖、丙二醛浓度、一氧化氮合酶活性、一氧化氮浓度下降,空腹胰岛素及β细胞功能指数上升均显著优于枸杞多糖治疗组(P<0.01)。结论:枸杞多糖及益气养阴活血复方能使链脲佐菌素诱导的糖尿病大鼠空腹胰岛素及β细胞功能指数升高,血糖下降,改善胰岛β细胞功能,可能与提高胰岛超氧化物歧化酶活性、降低一氧化氮合酶活性有关。

Protective effect of lycium barbarum polysaccharide and its compound recipe on pancreatic islet function in rats with streptozotocin-induced diabetes mellitus

BACKGROUND: At present, treatment of diabetes mellitus with western medicine starts from the angle of stimulating injured β cell of islet to strength insulin secreting. Treatment with traditional Chinese medicine is very important in protecting injured β cells.OBJECTIVE: To observe the protective effect of lycium barbarum polysaccharide and nourishing yin and activating blood compound recipe on pancreatic islet function in rats with streptozotocin-induced diabetes mellitus.DESIGN: A randomized and controlled animal experiments.SETTING: First Affiliated Hospital and Medical College of Henan University of Science and Technology.MATERIALS: Totally 70 male Wistar rats, aged 6 weeks, with body mass of 200 g, were used in this experiment.METHODS: This experiment was carried out at the Animal Room of Henan University of Science and Technology from October 2001 to April 2002. Totally 70 rats were divided into two groups: normal control group (n=10) and modeling group (n=60). Totally 30 successful model rats were randomly subdivided into 3 groups: streptozotocin model group, compound recipe treated group and lycium barbarum polysaccharide-treated group,with 10 rats in each group ;Intragastric administration of 60 g/kg Chinese herb compound recipe for nourishing yin and activating blood was performed on the rats in the compound recipe treated group at 9:00 every day (huangqi, shanyao, gegen respectively 30 g, gouqizi, danshen, huafen,digupi respectively 15 g, danggui, zhimu respectively 12 g, danpi, wuweizi respectively 10 g, shuizhi 5 g, shanyurou 20 g, etc, provided by drug store of First Hospital Affiliated to Henan University of Science and Technology,were decocted and condensed to be equivalent crude drug 3.0 kg/L with routine method). Intragastric administration of 0.5 g/kg lycium barbarum polysaccharide was given in the lyciun barbarum polysaccharide treated group (lycium barbarum polysaccharide was isolated and purified from ningxia barbary wolfberry fruit). Intragastric administration of comparative volume of normal saline was performed in the streptozotocin model group and normal control group, totally 3 weeks. The levels of fasting blood glucose (FBG) and insulin were measured at 3 weeks before and after experiment, and function index of β cell of islet was calculated; Pancreas was taken out to detect SOD activity, NOS activity and concentrations of NO and MDA were also detected.RESULTS: Ten rats in normal control group and 30 successful model rats in model group entered the stage of result analysis. ① In the initial stage of experiment, FBG level in each modeling group was significantly increased (t=16.51 to 10.07,P ＜ 0.01), while fasting insulin level and function index of β cell were significantly decreased (t=13.64 to 100.99 ,P ＜ 0.01 ) in comparison with normal control group. ② At 3 weeks after experiment, levels of FBG, NO , MDA , NOS activity were significantly decreased in the compound recipe treated group and lycium barbarum polysaccharide group compared with streptozotocin model group (t=8.08 to 72.68 ,P ＜ 0.01 ), while level of fasting insulin and function index of β cell, SOD activity were significantly increased in the compound recipe treated group and lycium barbarum polysaccharide group compared with streptozotocin model group (t=4.39 to 17.87,P ＜ 0.05-0.01 ). ③ Levels of FBG and MDA , NOS activity and concentration of NO were significantly decreased in the compound recipe treated group, and fasting insulin and function index of βcells were significantly increased in comparison with lycium barbarum polysaccharide group(P ＜ 0.01 ).CONCLUSION: Lycium barbarum polysaccharide and nourishing yin and activating blood compound recipe increase the level of fasting insulin and function index of βcell of rats with streptozotocin induced diabetes mellitus, decrease the level of blood glucose, improve the function of βcell of islet, which might be related to the increase of pancreatic islet SOD activity and decrease NOS activity.