title: Protective effect of clusterin on blood-retinal barrier breakdown in diabetic retinopathy.
abstract: Purpose. To investigate whether clusterin attenuates blood-retinal barrier (BRB) breakdown in diabetic retinopathy. Methods. Mice with streptozotocin-induced diabetes and advanced glycation end product-treated human retinal microvascular endothelial cells (HRMECs) were used to determine the effect of clusterin on vascular permeability and tight junction protein expression, through perfusion of retinal vessels with FITC-bovine serum albumin, a [(3)H]sucrose permeability assay, a cell viability assay, Western blot analysis, immunocytochemistry, immunohistochemistry, and terminal deoxynucleotidyl transferase biotin-dUTP nick-end labeling. Results. Up to 20 mug/mL of clusterin, which is 20 times the effective therapeutic concentration, did not affect the viability of the HRMECs. Moreover, it caused no toxicity in the retina. It effectively inhibited vascular endothelial growth factor-induced hyperpermeability in the HRMECs and the retinas. The antipermeability activity of clusterin was related to the restoration of tight junction proteins. Finally, it was shown to reduce leakage from the vessels in the diabetic retinas and to restore the expression of the tight junction proteins. Conclusions. The data suggest that clusterin, a well-known antipermeability factor naturally secreted by cells, may have therapeutic potential in the treatment of diabetic BRB breakdown.
authors.affiliation: Fight against Angiogenesis-Related Blindness Laboratory, Department of Ophthalmology, Seoul National University College of Medicine and Seoul Artificial Eye Center, Clinical Research Institute, Seoul National University Hospital, Seoul, Korea.
authors.forename: Jeong-Hun
authors.initials: JH
authors.lastname: Kim
authors.forename: Jin Hyoung
authors.initials: JH
authors.lastname: Kim
authors.forename: Young Suk
authors.initials: YS
authors.lastname: Yu
authors.forename: Bon Hong
authors.initials: BH
authors.lastname: Min
authors.forename: Kyu-Won
authors.initials: KW
authors.lastname: Kim
mesh_terms: D000818:Animals; D001813:Blood-Retinal Barrier / Q000187:drug effects*; D015153:Blotting, Western; D002199:Capillary Permeability / Q000187:drug effects; D018929:Cell Culture Techniques; D002470:Cell Survival / Q000187:drug effects; D051152:Clusterin / Q000302:isolation & purification / Q000494:pharmacology*; D003921:Diabetes Mellitus, Experimental / Q000188:drug therapy*; D003930:Diabetic Retinopathy / Q000188:drug therapy*; D004730:Endothelium, Vascular / Q000187:drug effects / Q000378:metabolism; D017127:Glycation End Products, Advanced / Q000494:pharmacology; D007150:Immunohistochemistry; D020287:In Situ Nick-End Labeling; D007267:Injections; D008565:Membrane Proteins / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D010750:Phosphoproteins / Q000378:metabolism; D012171:Retinal Vessels / Q000166:cytology; D042461:Vascular Endothelial Growth Factor A / Q000633:toxicity; D014822:Vitreous Body; D062826:Zonula Occludens-1 Protein
chemical_list: D051152:Clusterin; D017127:Glycation End Products, Advanced; D008565:Membrane Proteins; D010750:Phosphoproteins; C569042:TJP1 protein, human; C569043:Tjp1 protein, mouse; D042461:Vascular Endothelial Growth Factor A; D062826:Zonula Occludens-1 Protein