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Methylprednisolone inhibits interleukin-17 and interferon-gamma expression by both naive and primed T cells

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Author(s): Momčilović Miljana | Miljković Željka | Popadić Dušan | Marković Miloš | Savić Emina | Ramić Zorica | Miljković Djordje | Mostarica-Stojković Marija

Journal: BMC Immunology
ISSN 1471-2172

Volume: 9;
Issue: 1;
Start page: 47;
Date: 2008;
Original page

ABSTRACT
Abstract Background Interleukin-17 (IL-17)-producing cells are increasingly considered to be the major pathogenic population in various autoimmune disorders. The effects of glucocorticoids, widely used as therapeutics for inflammatory and autoimmune disorders, on IL-17 generation have not been thoroughly investigated so far. Therefore, we have explored the influence of methylprednisolone (MP) on IL-17 expression in rat lymphocytes, and compared it to the effect of the drug on interferon (IFN)-γ. Results Production of IL-17 in mitogen-stimulated lymph node cells (LNC) from non-treated rats, as well as in myelin basic protein (MBP)-stimulated draining LNC from rats immunized with spinal cord homogenate and complete Freund's adjuvant was significantly reduced by MP. The reduction was dose-dependent, sustained through the follow-up period of 48 hours, and was not achieved through anti-proliferative effect. Additionally, MP inhibited IL-17 production in purified T cells as well, but to less extent than in LNC. In its influence on IL-17 production MP inhibited Ror-γT transcription factor expression, as well as Jun phosphorylation, but not ERK or p38 activation in mitogen-stimulated LNC. Importantly, MP collaborated with IFN-γ in inhibiting IL-17 generation in LNC. Conclusion The observed difference in the effect of MP on IL-17 and IFN-γ could be important for the understanding of the variability in the efficiency of glucocorticoids in the treatment of autoimmune diseases.
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