Glucose and TGFβ2 Modulate the Viability of Cultured Human Retinal Pericytes and Their VEGF Release

Purpose: Determine the effects of glucose and exogenous TGFβ2 on viability and VEGF release by human retinal pericytes (HRP). Methods: Human retinal pericytes (HRP) were cultured in 5 mM (physiologic) or high (18 mM) glucose with or without added TGFβ2. Viable cells were counted; TGFβ2 and VEGF in the conditioned media (CM) were measured by ELISA. Results: High glucose significantly reduced viable cell number and increased the levels of TGFβ2 and VEGF. TGFβ2 caused a significant dose-dependent effect on viable cell number and on the level of VEGF secreted into the CM by HRP in physiologic glucose, decreasing viable cell number, and increasing VEGF release per 1000 cells at a low concentration (0.1 ng/ml) and increasing viable cell number and decreasing VEGF release per 1000 cells at higher concentrations (1.0 and 10 ng/ml). TGFβ2 affected neither parameter in high glucose. Conclusions: Elevated glucose decreased HRP viability and modulated changes in TGFβ2 and VEGF release. This suggests a novel mechanism for HRP dropout in diabetic retinopathy.

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