目的:探讨辛伐他汀保护高脂饮食致肾脏损伤的新机制.方法:雌性SD大鼠随机分为标准饮食组、高脂饮食组及辛伐他汀治疗组,高脂饮食组和辛伐他汀治疗组先予高脂饮食20周,后者在高脂饮食的同时予辛伐他汀[10 mg/(kg·d)]灌胃治疗8周.分析大鼠血脂和肾脏的病理学变化、肾脏中脂联素、脂联素受体R1,R2,AMP依赖的蛋白激酶(AMPK),过氧化物酶体增殖物激活受体α(PPARα)、葡萄糖调节蛋白78(GRP78)和转录因子GADD153(CHOP)的表达.结果:高脂饮食组大鼠体质和血脂水平明显增高,脂联素及其受体表达明显下调,AMPKα磷酸化降低,PPARα表达降低,GRP78和CHOP基因表达水平均明显上调.辛伐他汀治疗组上述指标均出现明显改善.结论:辛伐他汀可能通过升高肾脏脂联素及其受体的表达,减少内质网应激来改善高脂诱导的大鼠肾脏损伤.%Objective To probe the new mechanism of simvastatin on high-fat diet-induced kidney dam-age. Methods Female SD rats were subjected to a standard control diet(SCD)or high-fat diet(HFD)for 20 weeks,then the HFD group was randomly divided into HFD group and HFD group with simvastatin treatment (HFD+ST,10mg·kg-1·d-1 )for another 8 weeks. The expression of adiponectin,adiponectin receptors R1 and R2, Adenosine 5′-monophosphate(AMP)-activated protein kinase(AMPK),peroxisome proliferator-activated receptorα(PPARα),glucose regulated protein 78(GRP78)and GADD153(CHOP)in kidney were assessed respective-ly. Results Body weight and serum lipid levels in HFD group significantly increased ,expression of adiponectin and its receptors significantly down-regulated. Phosphorylation of AMPKα and PPARα expression decreased,and expression of GRP78 and CHOP up-regulated significantly. Above indexes in simvastatin treatment groups improved significantly. Conclusion Simvastatin can improve high-fat induced kidney damages ,probably by increasing expression of adiponectin and its receptors ,decreasing endoplasmic reticulum stress.
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