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Experimental Diabetes Research
Volume 2012, Article ID 209567, 8 pages
Research Article

Propyl Gallate Plays a Nephroprotective Role in Early Stage of Diabetic Nephropathy Associated with Suppression of Glomerular Endothelial Cell Proliferation and Angiogenesis

1Department of Nephrology, Renmin Hospital, Hubei University of Medicine, Hubei, Shiyan 442000, China
2Clinic Medicine Research Institute, Renmin Hospital, Hubei University of Medicine, Hubei, Shiyan 442000, China
3Department of Cardiology, Renmin Hospital, Hubei University of Medicine, Hubei, Shiyan 442000, China

Received 18 May 2012; Revised 9 July 2012; Accepted 10 July 2012

Academic Editor: A. Veves

Copyright © 2012 Shaojiang Tian et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


There is growing evidence suggesting that glomerular endothelial cell proliferation and angiogenesis may be responsible for the pathophysiological events in the early stage of diabetic nephropathy. This study was designed to investigate the factors related to glomerular endothelial cell proliferation and glomerular angiogenesis and assess the effect of propyl gallate on preventing these disorders in diabetic rats. We found that glomerular hypertrophy, glomerular mesangial matrix expansion, and albuminuria were significantly increased in DN rats. CD31+ endothelial cells significantly increased in glomerulus of diabetic rats. Double immunofluorescence staining showed some structurally defective vasculus tubes in glomerulus. Real-time PCR and western blot demonstrated the glomerular eNOS expression remained at the same level, while remarkable decreased NO productions and suppressed eNOS activities were observed in diabetic rats. Treatment with propyl gallate improved glomerular pathological changes, reduced endothelial cell proliferation, decreased albuminuria, and restored eNOS activity, but did not alter eNOS expression. These data suggest that endothelial cell proliferation and immature angiogenesis may be the contributors to progression of DN. Propyl gallate is a potential novel therapeutic agent on prevention of diabetic nephropathy.