Stability of epitheliotrophic factors in autologous serum eye drops from chronic Stevens-Johnson syndrome dry eye compared to non-autoimmune dry eye

Abstract

Purpose: To compare the concentrations of epitheliotrophic factors in autologous serum eye drops (ASE) prepared from sera of chronic Stevens-Johnson syndrome (SJS) patients with dry eyes to those prepared from non-autoimmune dry eye controls and to study the stability of the epitheliotrophic factors in different storage conditions. Methods: Twenty-percent ASE were prepared from 10 chronic SJS patients with dry eyes and 10 age-matched non-autoimmune dry eye controls. The concentrations of major epitheliotrophic factors comprising epidermal growth factor (EGF), transforming growth factor-beta1 (TGF-β1), transforming growth factor-beta2 (TGF-β2), and fibronectin in those ASE preparations were determined by enzyme-linked immunosorbent assay (ELISA) at baseline and after different storage conditions: at 4°C for 1 week and 1 month; and at -20°C for 1, 3 and 6 months. Results: There were no significant differences in the concentrations of EGF, TGF-β1, TGF-β2 and fibronectin in 20% ASE between the SJS and control groups (EGF: 176.9±40.9 vs. 185.5±36.9 pg/mL, TGF-β1: 9.5±2.1 vs. 9.5±1.9ng/mL, TGF-β2: 55.3±30.0 vs. 63.91±45.6 pg/mL and fibronectin: 70.5±20.2 vs. 62.2±21.3 g/mL, respectively). These factors were stable at 4°C for up to 1 month. Storage at -20°C for up to 6 months resulted in a slight decrease in TGF-β1 (SJS: from 9.58.4ng/mL, p < 0.01 and control: from 9.58.1ng/mL, p < 0.01). Conclusions: The results suggested that the epitheliotrophic capacity of ASE from chronic SJS should be comparable to those from non-autoimmune dry eye patients, and that ASE should be sufficiently stable for up to 6 months, if stored properly at -20°C. © 2011 Informa Healthcare USA, Inc.