title: Effects of calcium dobesilate on glomerulus TIMP1 and collagen IV of diabetic rats.
abstract: To observe the effects of calcium dobesilate on the expression of glomerular tissue inhibitor of metalloproteinase 1 (TIMP1), collagen IV, and ultrastructure of glomerular basement membrane in diabetic rats, rats model of diabetes was established by unilateral nephrectomy and intraperitoneal injection of 1% STZ (55 mg/kg), and rats were administered calcium dobesilate 100 mg/ kg (DD group) or distilled water (DM group) respectively. 12 weeks later, the changes in the renal ultrastructure and creatinine clearance rate (Ccr) were examined in each group. The expression of glomerular TIMP1 and collagen IV were studied by immunohistochemical staining. Our results showed that after 12 weeks, the Ccr in DD group increased and was significantly higher than that in DM group. Electron microscopy showed that thickness of glomerular capillary basement membrane (GBM) in Group DD was less than that of DM group. No hyperplasia of collagen fibers was found, and the distance between the holes of endothelial cells in DD group was not as even as that in the normal group, but more even than that of DM group, and podocyte processes was still in order. Immunohistochemical staining of glomeruli showed that expression of TIMP1 and collagen IV in DD group were significantly less than those of DM group DM. It is concluded that calcium dobesilate can improve diabetic nephropathy by inhibiting the over- accumulation of collagen IV and calcium dobesilate may also contribute to diabetes by inhibiting the expression of TIMP1.
authors.affiliation: Department of Nephrology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
authors.forename: Junwu
authors.initials: J
authors.lastname: Dong
authors.forename: Xiaochen
authors.initials: X
authors.lastname: Liu
authors.forename: Shenwei
authors.initials: S
authors.lastname: Liu
authors.forename: Mingbo
authors.initials: M
authors.lastname: Li
authors.forename: Yanmei
authors.initials: Y
authors.lastname: Xu
authors.forename: Bing
authors.initials: B
authors.lastname: Cui
mesh_terms: D000818:Animals; D002123:Calcium Dobesilate / Q000627:therapeutic use*; D024141:Collagen Type IV / Q000096:biosynthesis* / Q000235:genetics; D003921:Diabetes Mellitus, Experimental / Q000188:drug therapy; D003928:Diabetic Nephropathies / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D007678:Kidney Glomerulus / Q000378:metabolism* / Q000648:ultrastructure; D009392:Nephrectomy; D051381:Rats; D017207:Rats, Sprague-Dawley; D019715:Tissue Inhibitor of Metalloproteinase-1 / Q000096:biosynthesis* / Q000235:genetics
chemical_list: D024141:Collagen Type IV; D019715:Tissue Inhibitor of Metalloproteinase-1; D002123:Calcium Dobesilate