糖尿病大鼠外周血单个核细胞内与肾皮质中TGF-β1mRNA水平的相关性研究

目的:观测糖尿病状态及噻唑烷二酮类药物治疗对糖尿病大鼠外周血单个核细胞(PBMC)内TGF-β1mRNA水平的影响,比较其与肾皮质TGF-β1基因表达的关系.方法:54只SD大鼠随机分为正常对照组(C组)、糖尿病组(D组)及吡格列酮治疗组(DP组).2、4、8周每组各取6只,以RT-PCR 狭缝杂交法半定量检测PBMC内和肾皮质TGF-β1mRNA水平.结果:肾皮质TGF-β1mRNA水平8周内D组均高于C组(P<0.05),而PBMC内TGF-β1mRNA水平4周时略高于C组(1.27±0.38 vs 0.88±0.36,P>0.05),8周时差别有统计学意义(1.12±0.08 vs 0.84±0.16,P<0.05).D组和DP组在8周时PBMC内TGF-β1mRNA水平与肾皮质TGF-β1mRNA水平呈正相关(r=0.83、P=0.02,r=0.82、P=0.03).结论:在糖尿病肾病早期,PBMC内TGF-β1mRNA水平增高迟于肾皮质;但PBMC内TGF-β1mRNA水平可反映肾皮质TGF-β1mRNA水平的变化.

TGF-β1mRNA levels in renal cortex and peripheral blood mononuclear cells of diabetic rats

OBJECTIVE: To investigate the effect of hyperglycemia and pioglitazone on TGF-beta(1) gene expression in peripheral blood mononuclear cells (PBMC) and renal cortex, and the correlation of TGF-beta(1)mRNA levels between PBMC and renal cortex in STZ induced diabetic rats. METHODS: Fifty-four Sprague-Dawley rats were randomly divided into three groups: 18 normal control rats (group C), 18 diabetic rats (group D) and 18 diabetic rats treated with pioglitazone (20 mg x kg(-1)x d(-1), group DP). Six rats from each group were sacrificed at 2, 4, 8 weeks. TGF-beta(1)mRNA levels of PBMC and renal cortex were examined by RT-PCR+Slit hybridization analysis. RESULT: TGF-beta(1)mRNA level of renal cortex in group D was significantly higher than that in group C at each time point (P<0. 05); TGF-beta(1)mRNA level of PMBC in group D was slightly higher than that of group C at 4 weeks, and significantly higher at 8 weeks (P=0.01). There was positive correlation of TGF -beta(1)mRNA level between PBMC and renal cortex before (r=0.83, P=0.02) and after pioglitazone treatment at 8 weeks (r=0.82, P=0.03). CONCLUSION: TGF-beta(1)mRNA level of PBMC may reflect the change of TGF-beta(1) gene expression of renal cortex in diabetic rats.