Background Renal hypertrophy has been regarded as the early feature of diabetic nephropathy （DN）, which may eventually lead to proteinuria and renal fibrosis. However, the exact mechanism of renal hypertrophy is sti...Background Renal hypertrophy has been regarded as the early feature of diabetic nephropathy （DN）, which may eventually lead to proteinuria and renal fibrosis. However, the exact mechanism of renal hypertrophy is still unclear. The aim of this study was to investigate the possible association of connective tissue growth factor （CTGF） with renal hypertrophy in uninephrectomized diabetic rats. Methods Seventy-two Sprague-Dawley （SD） rats were randomly divided into two groups： control group （group C, n=32） and diabetic nephropathy （group DN, n=40）. Each group was re-divided into 4 subgroups according to the experimental period. The rats were sacrificed at 1, 2, 4, and 8 weeks respectively after induction of diabetes. Diabetes was induced by intraperitoneal injection of streptozotocin （STZ） after rats had received uninephrectomy. Blood glucose （BG）, body weight （BW）, 24-h urinary albumin excretion （24hUalb）, kidney weight （KW）, KW/BW, glomerular tuft area （AG）, glomerular tuft volume （VG）, proximal tubular area （AT） at each time point, the width of glomerular basement membrane （GBM） and tubular basement membrane （TBM） at week 8 were measured when the rats were sacrificed. Renal expression of CTGF and p27kipl were detected by immnnohistochemical staining. The relationship between CTGF expression and increasing of VG and AT was analyzed. Results There was a significant increase of 24hUalb, KW, and KW/BW from week 1 onward in diabetic rats compared to those in group C （P〈0.05, respectively）, diabetic rats also had a significant increase of AG, VG, and AT from week 1 onward. It was also shown that diabetic rats had a thickening of GBM [（245.7±103.0） nm vs （121.8±19.1） nm, P〈0.01] and TBM [（767.7±331.1） nm vs （293.0±110.5） nm, P〈0.01] at week 8. There was a weak expression for CTGF and p27kipl in normal glomeruli and tubuli, while a significant increasing expression of CTGF and p27kipl was found in glomeruli and tubuli in diabetic k展开更多
基金This research is supported by the National Natural Science Fundation (No. 30471732), Jiangsu Provincial Natural Science Fundation (No. 2002052), and the Jiangsu Key Medical Talent Project (No. 2002072).
文摘Background Renal hypertrophy has been regarded as the early feature of diabetic nephropathy （DN）, which may eventually lead to proteinuria and renal fibrosis. However, the exact mechanism of renal hypertrophy is still unclear. The aim of this study was to investigate the possible association of connective tissue growth factor （CTGF） with renal hypertrophy in uninephrectomized diabetic rats. Methods Seventy-two Sprague-Dawley （SD） rats were randomly divided into two groups： control group （group C, n=32） and diabetic nephropathy （group DN, n=40）. Each group was re-divided into 4 subgroups according to the experimental period. The rats were sacrificed at 1, 2, 4, and 8 weeks respectively after induction of diabetes. Diabetes was induced by intraperitoneal injection of streptozotocin （STZ） after rats had received uninephrectomy. Blood glucose （BG）, body weight （BW）, 24-h urinary albumin excretion （24hUalb）, kidney weight （KW）, KW/BW, glomerular tuft area （AG）, glomerular tuft volume （VG）, proximal tubular area （AT） at each time point, the width of glomerular basement membrane （GBM） and tubular basement membrane （TBM） at week 8 were measured when the rats were sacrificed. Renal expression of CTGF and p27kipl were detected by immnnohistochemical staining. The relationship between CTGF expression and increasing of VG and AT was analyzed. Results There was a significant increase of 24hUalb, KW, and KW/BW from week 1 onward in diabetic rats compared to those in group C （P〈0.05, respectively）, diabetic rats also had a significant increase of AG, VG, and AT from week 1 onward. It was also shown that diabetic rats had a thickening of GBM [（245.7±103.0） nm vs （121.8±19.1） nm, P〈0.01] and TBM [（767.7±331.1） nm vs （293.0±110.5） nm, P〈0.01] at week 8. There was a weak expression for CTGF and p27kipl in normal glomeruli and tubuli, while a significant increasing expression of CTGF and p27kipl was found in glomeruli and tubuli in diabetic k
基金supported by the National Basic Research Development Program of China (No. 2006CB504005)the National Natural Science Foundation of China (No. 30672247 and No. 30370717)Shanghai Science and Technology Commission (No. 064909003)
