@article {Burnstine318, author = {Michael A Burnstine and Susan G Elner and Victor M Elner}, title = {Orbital fibroblast chemokine modulation: effects of dexamethasone and cyclosporin A}, volume = {82}, number = {3}, pages = {318--322}, year = {1998}, doi = {10.1136/bjo.82.3.318}, publisher = {BMJ Publishing Group Ltd}, abstract = {AIM Orbital inflammation is common, but the mechanisms underlying leucocytic infiltration of orbital tissue are poorly understood. Human orbital fibroblasts (OF) express chemokines, interleukin 8 (IL-8) and monocyte chemotactic protein 1 (MCP-1), when exposed to proinflammatory cytokines. The effects of dexamethasone (DEX) and cyclosporin A (CSA) on OF IL-8 and MCP-1 were examined. METHODS Cultured human OF were incubated with recombinant interleukin 1β (rIL-1β; 0.2, 2.0, 20 ng/ml) alone or incubated with rIL-1β and DEX (10-8, 10-7, 10-6 M) or CSA (3, 30, 300 ng/ml) for 24 hours. ELISA and northern blot analyses were performed to determine OF IL-8 and MCP-1 protein secretion and mRNA expression, respectively. RESULTS OF lacked constitutive IL-8 or MCP-1 expression, but secreted significant amounts of these chemokines and expressed substantial steady state mRNA for both chemokines upon rIL-1β stimulation. DEX caused dose dependent inhibition of IL-1 induced IL-8 (p\<0.001) and MCP-1 (p\<0.05) secretion and mRNA expression at all concentrations of rIL-1β. CSA enhanced IL-1 induced OF IL-8 (p\<0.001) and suppressed rIL-1β induced OF MCP-1 (p\<0.05) secretion when lower doses of rIL-1β were used. These effects on secreted chemokines at different concentrations of rIL-1β and immunomodulating agents were corroborated by steady state OF IL-8 and MCP-1 mRNA expression. CONCLUSIONS DEX is a potent inhibitor of OF IL-8 and MCP-1. In contrast, CSA enhances IL-1 induced OF IL-8 and suppresses OF MCP-1. These observations may explain the relative lack of CSA effectiveness in human orbital diseases that respond to corticosteroids.}, issn = {0007-1161}, URL = {https://bjo.bmj.com/content/82/3/318}, eprint = {https://bjo.bmj.com/content/82/3/318.full.pdf}, journal = {British Journal of Ophthalmology} }