Systemic Factors Related to Intraocular Levels of Interleukin-6 and Vascular Endothelial Growth Factor in Diabetic Retinopathy

• Published in: Journal of ophthalmology Vol. 2019; no. 2019; pp. 1 - 6
• Main Authors: Jung, Byung Ju, Jeon, Sohee, Lee, Mee Yon
• Format: Journal Article
• Language: English
• Published: Cairo, Egypt Hindawi Publishing Corporation 2019; Hindawi; John Wiley & Sons, Inc; Hindawi Limited
• Subjects: Age; Alcohol; Apolipoproteins; Blood pressure; Body mass index; Cholesterol; Cytokines; Dextrose; Diabetes; Diabetic retinopathy; Fasting; Gender; Glucose; Homeostasis; Hyperglycemia; Hypertension; Insulin resistance; Interleukins; Lasers; Lipoprotein A; Lipoproteins; Low density lipoproteins; Patients; Pay-per-view television; Peptides; Permeability; Povidone; Regression analysis; Smoking; Tumor necrosis factor-TNF; Type 2 diabetes; Vascular endothelial growth factor; South Korea
• ISSN: 2090-004X; 2090-0058
• DOI: 10.1155/2019/4831967

This study is for identifying systemic factors correlating with intraocular levels of interleukin-6 (IL-6) and vascular endothelial growth factor (VEGF) in diabetic retinopathy. Forty-two consecutive patients undergoing pars plana vitrectomy (PPV) for PDR were included in this cross-sectional study. The aqueous humor was sampled just prior to PPV for assay of IL-6 and VEGF. One day before PPV, patient characteristics were recorded and a number of systemic markers were amassed, including fasting and postprandial glucose, homeostasis model assessment- (HOMA-) IR, HOMA-beta, C-peptide, insulin, total cholesterol, triglycerides, high-density lipoprotein cholesterol, low-density lipoprotein cholesterol, apolipoprotein- (Apo-) A, Apo-B, and lipoprotein A (Lp-A). Relationships between systemic determinants and intraocular cytokine levels were analyzed by regression analysis. Mean levels of IL-6 and VEGF were 15.3 pg/mL (range, 2.4–10124.5 pg/mL) and 21.1 pg/mL (range, 3.2–766.1 pg/mL), respectively. After adjustment for age, gender, duration of diabetes, and BMI, multivariate analysis showed significant association of smoking (p=0.002) and HOMA-IR (p=0.003) with intraocular IL-6 levels, while intraocular VEGF and systemic Lp-A levels correlated significantly (p=0.032). Insulin resistance and smoking status impacted intraocular levels of IL-6, while intraocular VEGF levels were influenced by Lp-A. An appreciation for the relationship between systemic factors and intraocular cytokines may help elucidate the complex pathophysiology of diabetic retinopathy.