BACKGROUND: This study evaluated the postulate that the vitreous of diabetic db/db mice, a genetic model of type 2 diabetes that manifests hyperglycemia and insulin resistance, exhibits alterations in angiogenic and metabolic factors that reflect abnormalities in the retinal microvasculature participatory in the pathogenesis of diabetic retinopathy. METHODS: Vitreous obtained from db/db and age-matched nondiabetic db/m mice was analyzed by Western blot for pigment epithelium-derived factor (PEDF) and vascular endothelial growth factor (VEGF), by immunoassay for type IV collagen, and by measurement of TBARs for lipid peroxide products. RESULTS: Compared to nondiabetic db/m controls, vitreous from db/db mice contained decreased PEDF and increased VEGF (VEGF:PEDF relative ratio 2.2 +/- 0.3 and 1.0 +/- 0.1 in db/db vs. db/m, respectively; p < 0.05), and elevated concentrations of lipid peroxide products (187 +/- 43 and 84 +/- 15 ng/ml in db/db vs. db/m, respectively; p < 0.05) and type IV collagen (5.2 +/- 0.7 and 3.1 +/- 0.4 nmol/ml in db/db vs. db/m, respectively; p < 0.05). These changes were observed at age 18-20 weeks, consistent with an early stage in the development of retinal microvascular pathology. CONCLUSIONS: The findings support the potential usefulness of vitreous from the db/db mouse as a model tissue for investigation of pathogenetic factors and assessment of therapeutic interventions in early diabetic retinopathy.
BACKGROUND: This study evaluated the postulate that the vitreous of diabetic db/db mice, a genetic model of type 2 diabetes that manifests hyperglycemia and insulin resistance, exhibits alterations in angiogenic and metabolic factors that reflect abnormalities in the retinal microvasculature participatory in the pathogenesis of diabetic retinopathy. METHODS: Vitreous obtained from db/db and age-matched nondiabetic db/m mice was analyzed by Western blot for pigment epithelium-derived factor (PEDF) and vascular endothelial growth factor (VEGF), by immunoassay for type IV collagen, and by measurement of TBARs for lipid peroxide products. RESULTS: Compared to nondiabetic db/m controls, vitreous from db/db mice contained decreased PEDF and increased VEGF (VEGF:PEDF relative ratio 2.2 +/- 0.3 and 1.0 +/- 0.1 in db/db vs. db/m, respectively; p < 0.05), and elevated concentrations of lipid peroxide products (187 +/- 43 and 84 +/- 15 ng/ml in db/db vs. db/m, respectively; p < 0.05) and type IV collagen (5.2 +/- 0.7 and 3.1 +/- 0.4 nmol/ml in db/db vs. db/m, respectively; p < 0.05). These changes were observed at age 18-20 weeks, consistent with an early stage in the development of retinal microvascular pathology. CONCLUSIONS: The findings support the potential usefulness of vitreous from the db/db mouse as a model tissue for investigation of pathogenetic factors and assessment of therapeutic interventions in early diabetic retinopathy.
Authors: Ali H Amin; Zakaria Y Abd Elmageed; Devika Nair; Megan I Partyka; Philip J Kadowitz; Souad Belmadani; Khalid Matrougui Journal: Lab Invest Date: 2010-05-03 Impact factor: 5.662
Authors: Kyoungmin Park; Kyungwon Lee; Bin Zhang; Ti Zhou; Xi He; Guoquan Gao; Anne R Murray; Jian-Xing Ma Journal: Mol Cell Biol Date: 2011-05-16 Impact factor: 4.272
Authors: Sarah ElHajj Chehadeh; Noura S Sayed; Hanin S Abdelsamad; Wael Almahmeed; Ahsan H Khandoker; Herbert F Jelinek; Habiba S Alsafar Journal: Front Endocrinol (Lausanne) Date: 2022-01-06 Impact factor: 5.555