A novel approach of proteomics to study the mechanism of action of grape seed proanthocyanidin extracts on diabetic retinopathy in rats

• Published in: Chinese medical journal Vol. 121; no. 24; pp. 2544 - 2552
• Main Authors: Li, Man, Ma, Ya-bing, Gao, Hai-qing, Li, Bao-ying, Cheng, Mei, Xu, Ling, Li, Xiao-li, Li, Xian-hua
• Format: Journal Article
• Language: English
• Published: China Department of Geriatrics, Qilu Hospital of Shandong University, Jinan, Shandong 250012, China 20.12.2008
• Subjects: Animals; Blood Glucose - drug effects; Blood Glucose - metabolism; Body Weight - drug effects; Diabetes Mellitus, Experimental - complications; Diabetes Mellitus, Experimental - metabolism; Diabetes Mellitus, Experimental - pathology; Diabetic Retinopathy - drug therapy; Diabetic Retinopathy - metabolism; Diabetic Retinopathy - pathology; Electrophoresis, Gel, Two-Dimensional; Glycated Hemoglobin A - metabolism; Glycation End Products, Advanced - metabolism; Grape Seed Extract; Male; Plant Extracts - pharmacology; Proanthocyanidins - pharmacology; Proteomics - methods; Rats; Rats, Wistar; 并发症; 糖尿病; 葡萄籽提取物; 视网膜病变; grape seed proanthocyanidin extracts; proteomics; diabetic retinopathy; advanced glycation end products
• ISSN: 0366-6999; 2542-5641
• DOI: 10.1097/00029330-200812020-00014

Background Diabetic retinopathy （DR） is a leading cause of visual impairment and blindness among the people of occupational age. To prevent the progress of retina injury, effective therapies directed toward the key molecular target are required. Grape seed proanthocyanidin extracts （GSPE） have been reported to be effective in treating diabetic complications, while little is discussed about the functional protein changes. Methods We used streptozotocin （STZ） to induce diabetes in rats. GSPE （250 mg/kg body weight per day） were administrated to diabetic rats for 24 weeks. Serum glucose, glycated hemoglobin and advanced glycation end products （AGEs） were determined. Consequently, 2-D difference gel electrophoresis and mass spectrometry were used to investigate retina protein profiles among control, STZ-induced diabetic rats, and GSPE treated diabetic rats. Results GSPE significantly reduced the AGEs of diabetic rats （P 〈0.05）. Moreover, GSPE significantly suppressed the vascular lesions of central regions, decreased capillary enlargements and neovascularization, similar to those of the control rats under light microscope. Eighteen proteins were found either up-regulated or down-regulated in the retina of STZ-induced diabetic rats. And seven proteins in the retina of diabetic rats were found to be back-regulated to normal levels after GSPE therapy. These back-regulated proteins are involved in many important biological processes such as heat shock, ubiquitin-proteasome system, cell proliferation, cell growth and glucose metabolism. Conclusions These findings might promote a better understanding for the mechanism of DR, and provide novel targets for evaluating the effects of GSPE therapy.