ObjectiveThe aim of this study was to determine the serum levels of angiopoietin-1 (Ang-1), angiopoietin-2 (Ang-2), soluble vascular endothelial tyrosine kinase receptor (Tie-2) and vascular endothelial growth factor (VEGF), in the serum of type 2 diabetic patients having non-proliferative (NPDR) or proliferative diabetic retinopathy (PDR).MethodsOne hundred patients with type 2 diabetes mellitus were involved in this cross-sectional study. They were classified into 25 diabetic patients without retinopathy, 35 patients with NPDR and 40 PDR patients. The study was carried out in the outpatients clinic of the Research Institute of Ophthalmology, Giza, Egypt from August 2016 through May 2017. Serum VEGF, Ang-1, Ang-2 and Tie-2 receptor levels were assayed using enzyme linked immunosorbent assay (ELISA). Data were analyzed by SPSS version 20 and Microsoft Excel (Version 10) using ANOVA, Harman’s single factor test, and Pearson’s Product Moment Correlation.ResultsThe serum levels of Ang-2 and VEGF were significantly elevated in NPDR groups and PDR group compared to diabetics without retinopathy groups (p<0.001). The serum levels of Ang-1 were significantly higher in the NPDR group compared to the diabetics without retinopathy groups (p<0.01), while no significant difference was observed between the PDR and diabetics without retinopathy groups. Ang-1/Ang-2 ratio was the lowest in the PDR group compared to the NPDR and diabetics without retinopathy groups. The serum levels of Tie-2 were not significantly changed among the three studied groups, serum Ang-2 was positively correlated with VEGF and Tie-2 in the PDR and NPDR groups.ConclusionThe angiopoietin/Tie system and VEGF are essential features in the commencement and development of PDR.

ObjectiveThe focus of this study aimed at measuring multiple inflammatory cytokines levels in the aqueous humor of patients with primary open angle glaucoma (POAG), pseudoexfoliation glaucoma (PEXG) and senile cataract.MethodsThis case control study was conducted at the Research Institute of Ophthalmology, Giza, Egypt in 2016. Aqueous humor (AH) samples were withdrawn from 50 patients (30 POAG, and 20 PEXG) and from 15 patients with senile cataract serving as controls. The levels of IL6, IL8, transforming growth factor β1 (TGFβ1), tumor necrosis growth factor α (TNFα) and serum amyloid A (SAA) were analyzed by ELISA immune-assay. Data were analyzed by SPSS 10, using Pearson Product-Moment Correlation and independent-samples t-test.ResultsThe levels of IL8, TGFβ1, TNFα and SAA were significantly higher in POAG and PEXG patients, compared to senile cataract patients. While the levels of IL6, were significantly decreased in both groups of glaucoma patients compared to cataract patients. Significant positive correlations were detected between IL6, IL 8 & TGF β1, IL 8; SAA, IL8 & TGFβ1, SAA in the aqueous humor of different groups.ConclusionThus the assayed cytokines including TGFβ1, TNFα, IL8 and SAA in aqueous humor, play a vital role in IOP elevations in patients with POAG and PEXG.

No abstract

Inter-eye asymmetry of IOP is a common finding in patients with glaucoma. There is a direct relationship between the amount of IOP asymmetry between the fellow eyes and the likelihood of having glaucoma.

No abstract