二甲双胍对2型糖尿病大鼠肾小球足细胞标志蛋白表达的影响  被引量:8

Protective effects of metformin on glomerular podocytes of type 2 diabetes model rats

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作  者:翟丽敏[1] 叶山东[1] 顾俊菲[1] 杨迪[1] 胡闻[2] 

机构地区:[1]安徽医科大学附属省立医院内分泌科,合肥230001 [2]安徽医科大学附属省立医院病理科,合肥230001

出  处:《中华医学杂志》2015年第40期3313-3316,共4页National Medical Journal of China

基  金:安徽省自然科学基金(11040606M159);安徽高校省级自然科学研究项目(KJ2011A157)

摘  要:目的 观察二甲双胍对2型糖尿病大鼠肾小球足细胞特异性蛋白podocalyxin (PCX)表达和排泄的影响,了解其对肾小球足细胞的保护作用.方法 高脂喂养结合腹腔注射小剂量链脲佐菌素建立大鼠2型糖尿病模型.25只造模成功的SD大鼠随机分为糖尿病组(9只) ,二甲双胍组(300 mg· kg-1· d-1,8只),格列本脲组(5 mg· kg-1 · d-1,8只);并设正常对照组(8 只).干预8周后,检测大鼠血糖(BG)、糖化血红蛋白(HbA1c)、尿PCX和尿肌酐的排泄;免疫组化观察大鼠肾脏PCX蛋白表达水平;实时定量PCR检测大鼠PCX mRNA表达水平;电镜下观察大鼠肾脏病理改变.结果 二甲双胍组、格列本脲组大鼠BG[(9.6 ±1.1)、(9.9 ±1.1)比 (15.6 ±1.6)mmol/L,均P〈0.05]和HbA1c[(7.0 ±0.3)%、(8.0 ±1.0)%比(12.4 ±0.6)%,均P〈0.05]均显著低于糖尿病组,但两药物干预组间差异均无统计学意义(均P〉0.05).糖尿病组大鼠尿PCX肌酐比高于正常对照组[(697 ±136)比(94 ±25) ng/g,P〈0.05],并伴有肾脏组织PCX蛋白(0.75 ±0.11 比3.18 ± 0.14,P〈0.05)和mRNA(0.08 ±0.09比1.00 ±0.02,P〈0.05)表达减少.二甲双胍和格列本脲治疗后上述指标均显著改善(均P〈0.05),且二甲双胍组尿PCX肌酐比[(404 ±83)比(516 ±38) ng/g]、肾脏组织PCX蛋白(1.54 ±0.06比1.06 ±0.10)和mRNA(0.23 ±0.01比0.16 ±0.04)与格列本脲组比较差异均有统计学意义(均P〈0.05).进一步观察发现,糖尿病组与正常对照组比较肾脏基底膜厚度[(267 ±22) 比(106 ±10) nm,P〈0.05]和足突融合率(0.80 ±0.07 比0)增高;与糖尿病组比较,二甲双胍组和格列本脲组肾脏基底膜厚度[(151 ±17)与(204 ±22) nm]和足突融合率(0.49 ± 0.04与0.57 ±0.03)降低,且两药物干预组间比较差异均有统计学意义(均P〈0.05).结论 二甲双胍具有降糖以外的肾小球足细胞保护作用,可能通过调节肾�Objective To observe the effects of metformin (MET) on podocalyxin (PCX) expression in renal tissue from type 2 diabetes mellitus (T2DM) model rats and investigate its protective effects against glomerular podocyte injury.Method The rat model of T2DM was established by feeding with high-fat diet and intraperitoneal injection of low dose of streptozotocin (STZ).All the rats were divided into four groups:diabetic group (n=9), metformin group (300 mg· kg -1· d-1, n=8), glibenclamide group (5 mg· kg -1· d-1, n=8) and normal group (n=8).After 8 weeks, urinary PCX and creatinine, blood glucose(BG) and glycated hemoglobin (HbA1c) were detected in all the rats.Immunohistochemistry was used to observe the protein expression of PCX in renal tissue.Real-time polymerase chain reaction (PCR) was performed to detect mRNA expression of PCX.Pathological changes of renal tissue were observed by electron microscope.Results Metformin and glyburide treatment decreased the levels of BG and HbA 1c [(9.6 ±1.1) and (9.9 ±1.1) vs (15.6 ±1.6) mmol/L, (7.0 ±0.3)% and (8.0 ±1.0)% vs (12.4 ±0.6)%, all P〈0.05], compared with diabetes group, while there was no statistically significant difference between the two intervention groups (P 〉0.05).The level of urinary PCX/urinary creatinine(UPCR) in diabetic rats were higher than that of normal group [ (697 ±136) vs (94 ±25) ng/g, P〈0.05), meanwhile the levels of protein and mRNA expression of PCX in kidney tissue reduced remarkably [(0.75 ±0.11) vs (3.18 ±0.14), (0.08 ±0.09) vs (1.00 ±0.02), both P〈0.05].Above-mentioned indicators could be ameliorated by metformin and glyburide treatment compared to normal group (P〈0.05), and there were statistically significant difference between the two intervention groups [(404 ±83) vs (516 ± 38) ng/g, (1.54 ±0.06) vs(1.06 ±0.10), (0.23 ±0.01) vs (0.16 ±0.04), all P〈0.05)].Further observation foun

关 键 词:糖尿病 2型 二甲双胍 足细胞 格列本脲 足糖萼蛋白 

分 类 号:R587.2[医药卫生—内分泌] R692.9[医药卫生—内科学]

 

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