摘要
目的探讨灵芝多糖联合二甲双胍对2型糖尿病大鼠心肌纤维化的预防作用及其作用机制。方法 SD大鼠高脂饮食喂养4周后,腹腔注射链脲佐菌素(STZ)30 mg·kg-1建立2型糖尿病(type 2 diabetes mellitus,T2DM)模型。成模后将大鼠随机分为正常对照组、模型组、灵芝多糖组(灵芝多糖600 mg·kg-1)、二甲双胍组(二甲双胍600 mg·kg-1)及联合用药组(灵芝多糖300 mg·kg-1+二甲双胍300 mg·kg-1)。药物治疗12周末测量大鼠空腹血糖;饱和苦味酸-天狼猩红染色下观察心肌纤维化程度;荧光分光光度计法检测大鼠血清晚期糖基化终末产物(advanced glycosylation end products,AGEs)的含量;测量心肌过氧化氢酶(CAT)、谷胱甘肽过氧化物酶(GSH-Px)水平;免疫组化法和蛋白印迹法检测心肌组织AGEs及CTGF蛋白的表达。结果联合用药组可有效抑制心肌纤维化的病理进程,升高心肌组织CAT、GSH-Px水平及降低血清AGEs含量,减少心肌组织AGEs及CTGF的表达。结论灵芝多糖联合二甲双胍可能通过抑制心肌氧化应激,降低血清AGEs水平,以及下调心肌AGEs、CTGF的表达来预防心肌纤维化。
Aim To study the effects of ganoderma lu-cidum polysaccharides and metformin on myocardial fi-brosis of type 2 diabetic rats and its mechanism. Methods SD rats were fed with high fat diet for 4 weeks, and then were injected with streptozotocin （30mg＆#183;kg-1 ） to replicate type 2 diabetic model. The diabetic rats were randomized into normal control group,diabetes group, ganoderma lucidum polysaccha-rides group （ 600 mg ＆#183; kg-1 ） , metformin group （ 600 mg＆#183;kg-1 ） , and combination group（ ganoderma lucid-um polysaccharides 300 mg＆#183;kg-1 ＋metformin 300 mg ＆#183;kg-1 ） . After 12 weeks’ treatment,the levels of fast-ing serum glucose were determined and the extent of myocardial fibrosis was observed by Picro-sirius red staining. The contents of AGEs in serum were deter-mined by fluorescence spectrophotometer. The activities of CAT and GSH-Px in myocardium were detected. Im-munohistochemical method and Western blot were used to detect myocardial tissue AGEs and CTGF protein ex-pression. Results Combination group could repress patho-proceeding of myocardial fibrosis efficiently, im-prove the activity of CAT and GSH-Px in myocardium and lower the concentration of AGEs in serum, as well as reduce the expression of AGEs and CTGF in myo-cardium. Conclusions Ganoderma lucidum polysac-charides and metformin could prevent myocardial fibro-sis. The possible mechanism may be related to repress-ing oxidative stress of myocardium, lowering serum AGEs and down regulating AGEs and CTGF of myocar-dium.
出处
《中国药理学通报》
CAS
CSCD
北大核心
2014年第4期536-541,共6页
Chinese Pharmacological Bulletin
基金
科技部"十一五"国家科技支撑计划子课题项目(No 2006DAI06A20-02)
江苏省优势学科项目
