黄芪多糖对糖尿病仓鼠脂代谢紊乱及心肌PPAR-α表达的影响

Effects of astragalus polysaccharides on lipid metabolism and PPAR-α gene expression in myocardium of diabetic hamsters

目的观察黄芪多糖(astragalus polysaccharides,APS)对糖尿病(diabetes mellitus,DM)仓鼠糖脂代谢和过氧化物酶体增生物激活体-α(proxisome proliferator activated receptors-α,PPAR-α)及其下游基因表达的影响,探讨其对DM心肌病变可能的干预机制。方法45只仓鼠随机分为3组。正常对照组:健康仓鼠15只;DM组:链脲佐菌素(STZ)诱导糖尿病仓鼠15只;APS治疗组:STZ诱导糖尿病仓鼠15只,每天给予APS2g/kg,灌胃10周。分别检测3组仓鼠的血糖、血脂、胰岛素、C肽、心肌酶谱水平,心肌细胞超微结构,荧光定量RT-PCR法和Western blot法分别检测心肌PPAR-α及靶基因(FATP、ACS)mRNA和蛋白的表达。结果DM组与正常组比较有明显的脂代谢紊乱;APS治疗组血糖、糖化血清蛋白、心肌酶谱和血脂水平较DM组明显下降,胰岛素和C肽水平无差异;APS治疗组心肌超微结构异常较DM组明显改善;APS组心肌组织PPAR-α、FATP和ACS的基因及蛋白表达较DM组显著增高。结论APS可以通过影响PPAR-α表达部分改善糖尿病仓鼠心肌脂代谢紊乱。

Objective This article was designed to observe the effects of astragalus polysaccharides （APS） on glucose and lipid metabolism, and on expressions of proxisome proliferator activated receptors-α （PPAR-α） and its downstream genes in diabetic hamsters cardiomyopathy. Methods Forty-five hamsters were divided into 3 groups randomly： normal control group （15 normal hamsters）, diabetic control group [15 streptozotocin （STZ）-induced diabetic hamsters], and astragalus polysaccharides （APS）-therapy group （15 STZ-induced diabetic hamsters administered with APS 2 g/kg per day orally for 10 weeks）. The levels of insulin, C-peptide, myocardial enzymes, glycosylated serum protein （GSP） and lipoprotein of all hamsters were measured. The ultrastructure of myocardium was studied, and the gene and protein expressions of PPAR-α, FATP and ACS were also detected by fluorescent quantitative RT-PCR and Western blot. Results It was shown that Compared with DM group, the levels of GSP, myocardial enzymes and lipoprotein of hamsters in APS-therapy group were lower, the myocardial ultrastructure of hamsters in APS-therapy group was well-protected, and the gene and protein expression of PPAR-α, FATP and ACS of hamsters in APS-therapy group were higher. Conclusions APS is partly effective in treating diabetic cardiomyopathy.