Abstract
Purpose
Localized application of hyperthermia is a potential treatment for retinal diseases. Vascular endothelial growth factor (VEGF) derived from the retinal pigment epithelium (RPE) is implicated in a variety of retinal pathologies. As it has been recently shown that hyperthermia may induce VEGF in the RPE, the aim of this study was to investigate hyperthermia-induced VEGF secretion and the pathways of hyperthermal VEGF upregulation in the RPE.
Material and methods
The human RPE cell line (Arpe-19) was exposed to 40°, 42°, 45° and 50 °C for one, five and 15 min. Cell viability was evaluated using a trypan blue exclusion assay, VEGF secretion was evaluated by an enzyme-linked immunosorbent assay ELISA) and VEGF expression was investigated using a Western blot. Involvement of mitogen-activated protein kinase (MAPK) pathways (ERK1/2, JNK, p38) and transient receptor potential vanilloid (TRPV) channels on VEGF induction was investigated using commercially available inhibitors (U0126, SB203580, SP600125, ruthenium red). Expression and phosphorylation of MAPKs was investigated using a Western blot.
Results
Hyperthermia induces time- and temperature-dependent cell death in human RPE cells. VEGF expression and secretion is induced by hyperthermia in a time- and temperature-dependent manner mediated by p38 and to a lesser degree by JNK. TRPV channels seem to play a minor role in regulation of hyperthermia-induced VEGF secretion.
Conclusions
Hyperthermia induces temperature-dependent secretion of VEGF in the RPE, which is mediated by p38 and, to a lesser extent, JNK. This may lead to undesired effects from hyperthermal treatment of retinal diseases.
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Acknowledgements
The authors thank Ms. Serap Luick for her excellent technical assistance. This study was presented at the Tagung der Vereinigung Norddeutscher Augenärzte 2012, the Meeting of the German Society of Ophthalmology 2012, and at the EVER Meeting 2012.
Declaration of interest statement
No conflict of interest exists regarding this study. Independent of this study, AK has been consultant for and has received honoraria for lectures by Novartis Pharma.
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Faby, H., Hillenkamp, J., Roider, J. et al. Hyperthermia-induced upregulation of vascular endothelial growth factor in retinal pigment epithelial cells is regulated by mitogen-activated protein kinases. Graefes Arch Clin Exp Ophthalmol 252, 1737–1745 (2014). https://doi.org/10.1007/s00417-014-2750-z
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DOI: https://doi.org/10.1007/s00417-014-2750-z