大蒜素对高脂饮食诱发大鼠非酒精性脂肪肝的保护作用

目的：观察大蒜素对大鼠非酒精性脂肪肝（NAFLD）的保护作用,并初步探讨相关机制。方法：SD大鼠50只,随机平均分成5组,每组10只：正常组、模型组、大蒜素高、中、低剂量组（30、20、10 mg/kg）。实验12周后观察各组大鼠肝功能酶学、血浆内毒素的含量、肝组织中血清丙二醛（MDA）含量、过氧化物歧化酶（SOD）活性、肝组织谷胱甘肽（GSH）含量、脂质代谢、血清游离脂肪酸（FFA）等水平,以及病理组织学的特点。结果：大蒜素高、中、低剂量组大鼠血脂和血浆内毒素水平与模型组相比差异均有统计学意义（P〈0.01或P〈0.05） ,各用药组大鼠血清SOD活性、MDA含量和FFA水平,以及肝组织SOD活性、MDA含量、GSH含量与模型组相比差异均有统计学意义（P〈0.01或P〈0.05） ,组织学观察表明高、中剂量大蒜素均能明显减轻肝细胞脂肪变性（P〈0.05）。结论：大蒜素对大鼠NAFLD具有很好的保护作用,并有一定的量效关系,其机制可能与对抗脂质过氧化反应和降低血浆内毒素水平有关。

Effect of garlicin on protecting nonalcoholic fat liver in SD rats induced by high fat diet

AIM: To study the effect of garlicin on protecting nonalcoholic fat liver in rats induced by high fat diet and explore the pathogenesis involved. METHODS: According to the dosage of garlicin and diet, fifty SD rats were randomly divided into five equal groups: normal control group, model control group and garlicin (10, 20, 30 mg/kg) groups. Apart from the rats in normal control group, the rats were all fed with high fat and high cholesterol diet. After 12 weeks, the levels of serum endotoxin (ETX), total cholesterols (TC), triglyceride (TG), superoxide dismutase (SOD), malondialdehyde (MDA), transaminase and free fatty acids (FFA) were detected. The levels of MDA, SOD, glutathione hormone (GSH) in hepatic tissue were also detected. Then the features of live pathology were observed. RESULTS: The levels of ETX, TC and TG in garlicin groups were significantly lower than those in model control group (P<0.05 or P<0.01). The SOD and GSH in serum and hepatic tissue of rats treated with garlicin were significantly higher than those in model control group (P<0.05 or P<0.01), while the serum MDA and FFA as well as MDA in hepatic tissue were significantly lower than those in model control group (P<0.05, or P<0.01). High dosage of garlicin could alleviate adipose degeneration of hepatic cells compared with low-dose garlicin group (P<0.05). CONCLUSION: Garlicin has high effect of preventing nonalcoholic fat liver disease in a dose-dependent manner. The anti-lipid peroxidation and lowering serum endotoxin effect of garlicin may be the mechanism.