title: Evaluation of neonatal streptozotocin induced diabetic rat model for the development of cataract.
abstract: Type 2 diabetes (T2D) generally follows prediabetes (PD) conditions such as impaired fasting glucose (IFG) and/or impaired glucose tolerance (IGT). Although studies reported an association of IGT or IFG with cataract, the experimental basis for PD associated cataract is not known. Hence, we evaluated neonatal streptozotocin (nSTZ) induced rat model to study PD associated cataractogenesis by injecting STZ to two-day old rats. While majority (70%) of nSTZ injected pups developed IGT (nSTZ-PD) by two months but not cataract even after seven months, remaining (30%) nSTZ rats developed hyperglycemia (nSTZ-D) by two months and mature cataract by seven months. Lens biochemical analysis indicated increased oxidative stress as indicated by increased SOD activity, lipid peroxidation, and protein carbonyl levels in nSTZ-D cataractous lens. There was also increased polyol pathway as assessed by aldose reductase activity and sorbitol levels. Though nSTZ-PD animals have not shown any signs of lenticular opacity, insolubilization of proteins along with enhanced polyol pathway was observed in the lens. Further there was increased oxidative stress in lens of IGT animals. These results suggest that oxidative stress along with increased polyol pathway might play a role in IGT-associated lens abnormalities. In conclusion, nSTZ-PD rat model could aid to investigate IGT-associated lens abnormalities.
authors.affiliation: Department of Biochemistry, National Institute of Nutrition, Jamai-Osmania, Hyderabad 500007, India.
authors.forename: Madhoosudan A
authors.initials: MA
authors.lastname: Patil
authors.affiliation: Department of Biochemistry, National Institute of Nutrition, Jamai-Osmania, Hyderabad 500007, India.
authors.forename: Palla
authors.initials: P
authors.lastname: Suryanarayana
authors.affiliation: Department of Pathology, National Institute of Nutrition, Hyderabad 500007, India.
authors.forename: Uday Kumar
authors.initials: UK
authors.lastname: Putcha
authors.affiliation: Department of Pathology, National Institute of Nutrition, Hyderabad 500007, India.
authors.forename: Myadara
authors.initials: M
authors.lastname: Srinivas
authors.affiliation: Department of Biochemistry, National Institute of Nutrition, Jamai-Osmania, Hyderabad 500007, India.
authors.forename: G Bhanuprakash
authors.identifier: 0000-0003-4787-3944
authors.initials: GB
authors.lastname: Reddy
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D002386:Cataract / Q000097:blood / Q000209:etiology* / Q000378:metabolism; D003921:Diabetes Mellitus, Experimental / Q000097:blood / Q000139:chemically induced / Q000150:complications*; D003924:Diabetes Mellitus, Type 2 / Q000097:blood / Q000139:chemically induced / Q000150:complications*; D004195:Disease Models, Animal; D005951:Glucose Tolerance Test; D006943:Hyperglycemia / Q000150:complications; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley