背景:钩藤具有清热平肝、活血通经、息风止痉功效,主要用于治疗头晕目眩、惊痫抽搐和全身麻木等心脑血管和神经系统疾病.目的:观察钩藤水煎剂对高脂性肥胖大鼠体质量、进食量、摄入热量、血糖、胰岛素、抗氧化能力的影响.设计:完全随机分组设计,对照实验.单位:兰州大学基础医学院生理研究所材料:实验于2003-03/2003-05在兰州大学基础医学院生理研究所实验室完成.选用健康雄性SD大鼠27只,随机分为3组,每组9只,分别为正常对照组,高脂饮食组和钩藤组.方法:[1]正常对照组饲以基础饲料(蛋白质、脂肪、碳水化合物含量分别为18.2%,4.5%,55.2%),高脂饮食组及钩藤组均给予高脂饲料(蛋白质、脂肪、碳水化合物含量分别为23.7%,21.6%,39.0%).[2]正常对照组及高脂饮食组每日正常自由饮水.钩藤组自实验第1天起自由饮服10 g/L的钩藤水煎剂,后每天增加剂量至第1周末达到60g/L,并维持到第7周末.[3]每天称量各组大鼠的进食量,计算摄入热量,每周称量各组大鼠体质量,计算李氏指数[体质量(g)1/3×103/体长(cm)].[4]在实验第7周末大鼠禁食12 h后,取血,采用己糖激酶法测定空腹血糖、用放免法测定胰岛素,用硫代巴比妥酸比色法测定丙二醛,用比色法测定总抗氧化力及血清游离脂肪酸水平.[5]3组间计量资料差异性比较采用F检验,两两比较采用LSD法.主要观察指标:钩藤水煎剂对高脂性肥胖大鼠体质量、进食量、摄入热量、空腹血糖、血清胰岛素、游离脂肪酸、丙二醛、总抗氧化能力的影响.结果:进入结果分析大鼠27只,每组9只.[1]体质量:实验第3-7周末,高脂饮食组明显高于正常对照组(P＜0.05～0.01),钩藤组明显低于高脂饮食组(P＜0.05～0.01);实验第1～6周末,钩藤组与正常对照组相近(P＞0.05),第7周高于正常对照组(P＜0.01).[2]李氏指数:实验第7周末,高脂饮食组明显高于正常对照组和钩藤组(P＜0.01).[3]摄食量:实验第1～7周末,钩藤组大鼠进食量均明显低于正常对照组(P＜0.01);第3,5,6,7周末钩藤组明显低于高脂饮食组(P＜0.05～0.01).[4]摄入热量:钩藤组第1,2,4周末明显高于正常对照组(P＜0.05～0.01).第3,5,6,7周末钩藤组大鼠明显低于高脂饮食组(P＜0.01).[5]空腹血糖:3组大鼠相近.[6]血胰岛素和丙二醛水平:高脂饮食组明显高于正常对照组和钩藤组(P＜0.01).[7]游离脂肪酸水平:高脂饮食组明显高于正常对照组(P＜0.05),与钩藤组相近.[8]总抗氧化力:高脂饮食组明显低于钩藤组(P＜0.01).结论:[1]饮用钩藤水煎剂可明显抑制高脂性肥胖大鼠的体质量、进食量.[2]可降低高脂性肥胖大鼠自由基和血清胰岛素水平,且血清胰岛素水平降低可能是由于游离脂肪酸水平降低所致.[4]饮用钩藤水煎剂可增加高脂性肥胖大鼠的总抗氧化能力.%BACKGROUND: Ramulus Uncariae et Uncus can be used to treat many diseases of cardiovesculer and neurosystem by calming and protecting endothelium and neuron.OBJECTIVE: To study the effects of drinking water extracts of Ramulus Uncariae et Uncus on body mass, food intake, energy intakes, serum glucose, insulin, total antioxidative ability of high-fat-fed rats.DESIGN: A completely randomized and controlled experiment.SETTING: Institute of Physiology, Foundational Medical College of Lanzhou University.MATERIALS: The experiment which is Gansu Province Key Labor of Pre-clinical Research for Chinese Herbs & New Drugs was carried out at the Physiological Laboratory of Institute of Foundational Medical College of Lanzhou University from March 2003 to May 2003. Twenty-seven healthy male SD rats were randomly divided into the following three groups (9 rats each group): namely, the normal control group, the high-fat-fed group and the Ramulus Uncariae et Uncus group.METHODS: [1] The rats of control group were fed with referenced diets(Protein, fat and carbohydrate was made up fore18.2%, 4.5%, 55.2% respectively), while the rats of high-fat-fed and the Ramulus Uncariae et Uncus group were fed with high-fat diets in which protein, fat and carbohydrate accounted for 23.7%, 21.6%, 39.0% respectively. [2]The rats in control and high-fat group could drink water freely every day while the rats in Ramulus Uncariae et Uncus group drank freely one percent water extract of Ramulus Uncariae et Uncus at the first day of the experiment, later the concentration of Ramulus Uncariae et Uncus increased gradually to six percent at the sixth day, which lasted until the end of the experiment. [3]Food intake was monitored daily, and body mass weekly at set time, the energy intake was calculated on basis of food intake. We calculated the Lee's Index [(body mass)1/3 (g) × 103 / body length (cm)]. [4] At the end of the seventh week, all rats were fasted for twelve hours to collect blood for the measure of some serum items. The serum levels of glucose were determined with hexokinase. The levels of insulin was measured by Radioimmunology methods. Malondiadehyde was measured by thiobarbituricbased colorimetric assay. Total antioxidative ability and free fatty acid were evaluated by colorimetric assay. [5] The difference of quantity data among the tree groups were statistically analyzed by F analysis, while the difference between two groups was analyzed by LSD methods. The main indexes of the experiment were body mass, food intake, energy intake, serum glucose after fasting, insulin, free fatty acid, malondialdehyde and total antioxidative ability respectively.RESULTS: Twenty-seven rats date was analyzed and nine rats in every group. [1] Body mass: Compared with the high-fat-fed group, body mass in rats of the control group and the Ramulus Uncariae et Uncus group were less from the end of the third week to the end of the experiment (P ＜ 0.05-0.01).As compared between the Ramulus Uncariae et Uncus group and the control group, there was no significant difference from the first week to the sixth week (P ＞ 0.05), while the body mass of the former group was bigger than that of the latter at the end of the seventh week (P ＜ 0.01). [2] Lee's Index of the rats in high-fat-fed group was significantly higher than those of the rats in the control and Ramulus Uncariae et Uncus group (P ＜ 0.01).[3] Food intake: From the first week, compared with the control group, the food intake of rats in Ramulus Uncariae et Uncus group was less (P ＜ 0.01)and lower than that in high-fat-fed group at the end of the third, fifth, sixth and seventh week, too (P ＜ 0.05-0.01). [4] Energy intake: As the food was high-fat, the Energy intake of rats in the Ramulus Uncariae et Uncus group was higher than that of the control group at the end of the first, second and forth week (P ＜ 0.05-0.01), while less than that of the high-fat-fed group at the end of the third, fifth, sixth and seventh week (P ＜ 0.01). [5] The serum glucose: There was no statistical significance among the three groups. [6]The level of serum insulin and malondiadehyde of the rats in high-fat-fed group were higher than that of the control group and the Ramulus Uncariae et Uncus (P ＜ 0.01). [7] The level of free fatly acid of rats in high-fat-fed group was higher than that of the control group (P ＜ 0.05), while there wasno statistical difference compared with the Ramulus Uncariae et Uncus group. [8] The level of total antioxidative of the rats in high-fat group was lower than that of the Ramulus Uncariae et Uncus group (P ＜ 0.01).CONCLUSION: [1] Drinking water extracts of Ramulus Uncariae et Uncus could inhibit the weight gain and food intake, [2] reduce level of free radical and insulin of serum, which could be caused by the dec lining of free fatty acid. [3] In the same time, increase the total antioxidative ability of the obese rats caused by high-fat diets.
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