目的:探讨藤茶双氢杨梅素对动脉粥样硬化(AS)大鼠血脂、抗氧化作用的影响。方法健康 SPF 级雄性Wistar 大鼠60只,随机分正常对照组、模型对照组、阳性对照组及双氢杨梅素小剂量组和大剂量组,每组12只。除正常对照组外,其他组大鼠饲养高脂饲料+腹腔注射维生素 D3,复制动脉粥样硬化模型。阳性对照组灌胃辛伐他汀5 mg·kg-1,双氢杨梅素大剂量组、小剂量组分别灌胃广西藤茶双氢杨梅素40,10 mg·kg-1,正常对照组和模型对照组灌胃等体积纯化水,每天1次,连续24周。检测大鼠血清血脂、抗氧化作用指标。结果与模型对照组比较,双氢杨梅素大剂量组、小剂量组的三酰甘油由(191.65±101.10)mg·L-1减少至(111.10±29.29),(120.55±38.12) mg·L-1;总胆固醇(TC)由(151.64±33.62)mg·L-1减少至(148.49±30.14),(118.90±27.38)mg·L-1;高密度脂蛋白胆固醇由(1.29±0.68)mmol·L-1提高到(2.10±0.70),(1.62±0.61)mmol·L-1;低密度脂蛋白胆固醇由(5.01±1.33)mmol·L-1下降至(3.97±0.78),(4.28±0.79) mmol·L-1;超氧化物歧化酶活性由(141.03±42.52)U·mL-1提高到(187.97±42-08),(150.99±46.17)U·mL-1;丙二醛由(20.51±3.81)nmol·mL-1下降至(17.64±1.54),(18.52±3.42)nmol·mL-1,差异有统计学意义(P〈0-05或P〈0.01)。结论藤茶双氢杨梅素可改善AS 大鼠血脂水平和抗氧化作用,对AS 具有一定的防治作用。
Objective To observe the effect of dihydromyricetin of ampelopsis grossedentata on lipid metabolism and antioxidation in atherosclerosis (AS) rats. Methods Sixty Wistar rats were randomly divided into five groups (n = 12 each):normal control group, model control group, positive control group, high dose dihydromyricetin group (40 mg·kg-1 ) and low dose dihydromyricetin group (10 mg·kg-1 ). Except normal control group, rats in the other groups were injected with a single dose of vitamin D3(600 000 U·kg-1 ) and loaded with high fat diet to establish AS model. Simvastatin (5 mg·kg-1 ) was intragastrically administered to positive control group. High and low dose dihydromyricetin groups received intragastric administration of 40 and 10 mg·kg-1 dihydromyricetin, respectively. Equal volume of purified water was given to normal and model group. After 24 weeks of administration, serum levels of lipids, activities of superoxide-dismutase (SOD) and malonicdialdehyde (MAD) were determined. Results As compared with model control group, triglycerides (TG) of high and low dose dihydromyricetin groups was decreased [(191. 65±101. 10) vs. (111. 10±29. 29) and (120. 55±38. 12) mg·L-1 , respectively], total cholesterol (TC) was decreased [(151. 64±33. 62) vs. (148. 49±30. 14) and (118. 90±27. 38) mg·L-1 ], and high density lipoprotein cholesterol (HDL-C) was increased [(1. 29±0. 68) vs. (2. 10±0. 70) and (1. 62±0. 61) mmol·L-1 ], low density lipoprotein cholesterol (LDL-C) was decreased [(5. 01±1. 33) vs. (3. 97±0. 78) and (4. 28±0. 79) mmol·L-1 ], activity of SOD was increased [(141. 03±42. 52) vs. (187. 97±42. 08) and (150. 99±46. 17) U·mL-1 ], and MDA was decreased [(20. 51±3. 81) vs. (17. 64±1. 54) and (18. 52± 3. 42) nmol·mL-1 ], with significant differences (P〈0. 05, P〈0. 01). Conclusion Dihydromyricetin can reduce the level of serum lipid, improve antioxidat