芝麻素的抗氧化作用及其对代谢综合征大鼠肾病的影响

目的探讨芝麻素(sesamin,Ses)对代谢综合征大鼠肾病的影响。方法高脂、高糖诱导大鼠代谢综合征24wk,第9周口服含药芝麻素(120、60、30mg·kg-1.d-1)和辛伐他汀(5mg·kg-1.d-1)16wk,称体重和左肾湿重;测血糖、血脂、血压、肾功能、肾皮质氧化和抗氧化指标;HE和Masson染色观察肾脏形态及胶原沉积;免疫组化法表达诱导型一氧化氮合酶和硝基酪氨酸。结果芝麻素高中剂量组能明显降低代谢综合征大鼠血糖、血脂和血压,提高肾皮质总超氧化物歧化酶、过氧化氢酶、谷胱甘肽过氧化酶活性,减少丙二醛、NO2-/NO3-和羟自由基含量,下调诱导型一氧化氮合酶和硝基酪氨酸,减轻肾小球与肾间质胶原沉积,逆转肾小球硬化和肾间质纤维化,改善肾功能。结论芝麻素具有抗氧化应激和改善代谢综合征肾病的作用。

Antioxidation and renoprotective effect of sesamin in metabolic syndrome rats

Aim To explore renoprotective effect of sesamin in metabolic syndrome rats.Methods Metabolic syndrome was induced by high-fat and refined-carbohydrate diet.Sesamin(120,60 and 30 mg·kg-1·d-1)and simvastatin(5 mg·kg-1·d-1)were given to the metabolic syndrome rats at 9th week,which lasted for 16 weeks.After 24 weeks,body weight,left kidney humid weight,blood sugar,blood fat,systolic blood pressure,renal function,and indexes of oxygenation and antioxygenation for renal cortex were measured.Pathological changes,collagen deposition and iNOS protein and nitrotyrosine expression of kidney were observed by HE-staining,Masson-staining and immunohistochemical method,respectively.Results Decreasein blood sugar,blood fat,blood pressure,and MDA,·OH and NO2-/NO3-in renal cortex was obviously observed in high-and middle-dosage sesamin groups;activities of T-SOD,CAT and GSH-Px in renal cortex was increased;expression of iNOS protein and nitrotyrosine in kidney was down-regulated;inflammatory cell infiltration and collagen deposition in renal glomerulus and renal interstitium were improved;glomerular sclerosis and renal interstitial fibrosis were reversed;renal function was ameliorated.Conclusion Sesamin played a role in antioxidative stress and had protective effect upon renal diseases in metabolic syndrome rats.