Abstract
Background
Serum eyedrops have been successfully used in the treatment of severe dry eye, persistent epithelial defects and other severe ocular surface disorders. A number of clinical studies showed a variable efficacy of this approach, but the parameters for the production of this blood product varied significantly. In order to establish an optimised protocol for the production of serum eyedrops, we examined the effect of various clotting times, centrifugation forces, types of diluent and dilutions on the concentration of growth factors, fibronectin, and vitamins in serum and tested the epitheliotrophic capacity of these serum modifications in a cell culture model of human SV-40-immortalised corneal epithelial cells (HCE-T).
Methods
Serum samples were prepared with a clotting time of 20, 60 or 120 min, a centrifugation force of 500×g or 3,000×g, and diluted with BSS or isotonic saline. The concentrations of EGF, TGF-β1, PDGF-AB, FGF, HGF, fibronectin, vitamin A and vitamin E in these samples were evaluated with ELISA and HPLC. HCE-T cells were incubated for 24, 48, 72, 96 and 144 h with 100, 50, 25, 12.5, 6.25 and 3.125% serum in diluent, and cell proliferation, migration and differentiation were evaluated by means of a luminescence-based ATP assay, a colony-dispersion assay and scanning electron microscopy.
Results
Using a longer clotting time resulted in an increased concentration of all the epitheliotrophic factors examined in serum; the diffference was statistically significant for EGF, TGF-β1 and HGF. Increasing the g force of centrifugation from 500×g to 3,000×g resulted in significantly less TGF-β1, but more EGF and vitamin A. Cell proliferation was better supported by serum prepared with 3,000×g and diluted with BSS. Serum prepared with a longer clotting time yielded better cell migration and differentiation.
Conclusion
Clotting time, centrifugation and diluents have a significant impact on the composition and epitheliotrophic effects of serum. A long clotting time (≥120 min), a sharp centrifugation (3,000×g for 15 min) and dilution with BSS improve the ability of serum eyedrops to support proliferation, migration and differentiation of corneal epithelial cells.
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Acknowledgements
The authors thank Kaoru Araki-Sasaki, Tane Memorial Eye Hospital, Japan, and Fiona Stapleton, University of New South Wales, Australia, for providing HCE-T cell line; Gudrun Müller, Department of Ophthalmology, University of Lübeck, for technical assistance; Gudrun Knebel and Harry Manfeldt, Institute of Anatomy, University of Lübeck, for excellent support in SEM.
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Liu, L., Hartwig, D., Harloff, S. et al. An optimised protocol for the production of autologous serum eyedrops. Graefe's Arch Clin Exp Ophthalmol 243, 706–714 (2005). https://doi.org/10.1007/s00417-004-1106-5
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DOI: https://doi.org/10.1007/s00417-004-1106-5