摘要
目的观察二甲双胍(MET)对2型糖尿病(T2DM)模型大鼠肾组织非酶糖基化终末产物(AGEs)及其受体(RAGE)mRNA表达的影响,探讨MET对糖尿病肾病的保护机制。方法用高脂饲料喂养结合腹腔注射小剂量链脲佐菌素(STZ)建立2型糖尿病大鼠模型。模型大鼠随机分组,给予二甲双胍干预治疗(MET组,300 mg·kg^(-1)·d^(-1))、格列本脲干预(GLY组,5 mg·kg^(-1)·d^(-1)),并设立糖尿病模型组(T2DM组)和正常对照组(NC组)。给药8周后,观察各组大鼠血糖(BG)、糖化血红蛋白(Hb A1c)、尿素氮(BUN)、尿白蛋白和尿AGEs排泄的情况;免疫组化测肾小球AGEs蛋白表达;Real-time PCR检测肾组织RAGE mRNA表达。结果 8周末,MET组及GLY组BG、Hb A1c、FINS、尿白蛋白/尿肌酐(UACR)、基底膜厚度(GBMT)明显低于T2DM组,高于NC组(P<0.05),MET组与GLY组BG、Hb A1c和FINS差异无统计学意义(P>0.05);MET组尿AGEs/尿肌酐(UGCR)、肾组织AGEs蛋白和RAGE mRNA表达明显低于糖尿病模型组(P<0.05),但比NC组高(P<0.05);MET组UGCR、肾组织AGEs和RAGE mRNA表达低于GLY组(P<0.05)。结论 MET可减少AGEs在糖尿病大鼠肾组织的积累,并下调糖尿病大鼠肾组织RAGE mRNA的过度表达,该作用可能与其肾脏保护作用有关。
Aims To observe the influences of met-formin ( MET ) on the expression of renal tissue ad-vanced glyclation end-products( AGEs) protein and its receptor mRNA ( RAGE mRNA ) in type 2 diabetes mellitus (T2DM) model rats, and to discuss the mech-anism of the MET in the treatment of diabetic nephrop-athy ( DN ) . Methods The rat model of T2 DM was established by fed with high-fat diet and intraperitoneal injection of low-dose of streptozotocin ( STZ ) . All rats were randomly divided into metformin group( MET,300 mg·kg-1 ·d-1 ) , glyburide group( GLY,5 mg·kg-1 ·d-1),T2DM model group(T2DM) and normal con-trol group ( NC ) . After 8 weeks ’ observation, blood glucose ( BG ) , glycated hemoglobin ( HbA1 c ) , blood urea nitrogen(BUN), urinary albumin,urinary AGEs and urine creatinine were detected. The expression of renal tissue AGEs was detected by immunohistochemis-try assay, and the expression of RAGE mRNA was measured by real-time PCR. Results The levels of BG, HbA1c , urinary albumin/urine creatinine ( UACR ) , glomerular basement membrane thickness ( GBMT ) in MET group and GLY group were signifi-cantly lower than those of T2DM group, while higher than those of NC group(P<0. 05), the levels of BG, FINS and HbA1 c were not statistically significant be-tween MET and GLY group ( P >0. 05 ) . The urinary AGEs/urine creatinine( UGCR) , the expressions of re-nal tissue AGEs and RAGE mRNA in MET group and GLY group were significantly decreased compared with those of T2 DM group ( P < 0. 05 ) , but higher than those of NC group ( P <0. 05 ) . The UGCR, the ex-pressions of AGEs and RAGE mRNA in MET group were lower than those of GLY group(P<0. 05). Con-clusion MET can reduce the accumulation of AGEs in the renal tissue,and down-regulate the over-expres-sion of RAGE mRNA in T2DM rats.
出处
《中国药理学通报》
CAS
CSCD
北大核心
2016年第5期703-707,共5页
Chinese Pharmacological Bulletin
基金
安徽省高校省级自然科学研究项目(No KJ2011A157)
安徽省自然科学基金资助项目(No 1508085SMH227)
