Abstract
Background
The purpose of this study was to investigate the effect of clonidine, an alpha2-adrenergic receptor (α2-ADR) agonist, on vascular endothelial growth factor (VEGF) expression and secretion in the human retinal pigment epithelial cell line (ARPE-19) stimulated with interleukin-1β (IL-1β).
Methods
Alpha2-ADRs (α2A, α2B, and α2C) mRNA expression in ARPE-19 cells was examined by semiquantitative reverse transcription polymerase chain reaction (RT-PCR). Clonidine and inhibitors against protein kinases that are involved in the regulation of the intracellular signal transduction were added to serum-free medium before stimulation of IL-1β. The α2-ADR antagonist, Yohimbine, was loaded 30 min before the addition of clonidine. The expression of VEGF mRNA and protein was measured by real-time PCR and enzyme-linked immunosorbent assay.
Results
Alpha2A-ADR, α2B-ADR, and α2C-ADR mRNA was expressed in RPE cells. Clonidine, an inhibitor of p38MAPK and MEK1/2, inhibited the expression of VEGF protein and mRNA in the RPE cells stimulated with IL-1β. The inhibitory effect of clonidine on the secretion of VEGF protein stimulated with IL-1β was blocked by α2-ADR antagonists.
Conclusions
The effect of clonidine on the expression of VEGF may be via suppression of the p38MAPK and MEK1/2 signal transduction pathways activated with IL-1β.
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Acknowledgments
This work was supported in part by a Grant-in-Aid for Scientific Research (No.: 19791259) from the Ministry of Education, Science, Sports, and Culture of Japan.
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The authors have full control of all primary data, and agree to allow Graefe’s Archive for Clinic and Experimental Ophthalmology to review the data upon request.
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Watanabe, K., Zhang, XY., Kitagawa, K. et al. The effect of clonidine on VEGF expression in human retinal pigment epithelial cells (ARPE-19). Graefes Arch Clin Exp Ophthalmol 247, 207–213 (2009). https://doi.org/10.1007/s00417-008-0990-5
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DOI: https://doi.org/10.1007/s00417-008-0990-5