Normal inflammasome activation and low production of IL-23 by monocyte-derived macrophages from subjects with a history of reactive arthritis. (August 2013)

• Record Type: Journal Article
• Authors: Välimäki, E; Aittomäki, S; Karenko, L; Kantonen, J; Pettersson, T; Turunen, U; Matikainen, S; Leirisalo-Repo, M; Repo, H
• Is Part Of: Scandinavian journal of rheumatology. Volume 42:Number 4(2013)
• Page Start: 294
• Page End: 298
• Publication Date: 2013-08
• Subjects: Rheumatology -- Periodicals; Arthritis; Rheumatic Diseases; 616.72005
• DOI: 10.3109/03009742.2012.754940
• Languages: English
• ISSNs: 0300-9742

Abstract

<abstract> <title> <x xml:space="preserve">Abstract</x> </title> <p> <bold>Objectives:</bold> The pathogenesis of reactive arthritis (ReA) is incompletely understood but may involve aberration(s) in the host's innate immune response towards infecting microbes. We therefore studied the production of interleukin (IL)-1β, a marker of inflammasome activation, and of IL-6, IL-12, IL-23, and tumour necrosis factor (TNF)-α, promoters of T-cell differentiation, by peripheral blood mononuclear cells (PBMNs) and monocyte-derived macrophages from healthy subjects with a history of ReA.</p> <p> <bold>Method:</bold> The study included 10 human leucocyte antigen (HLA)-B27-positive healthy subjects with previous ReA triggered by <italic>Yersinia enterocolitica</italic> O:3 infection and 20 healthy reference subjects, of whom 10 were HLA-B27 positive. PBMNs and macrophages were cultured for 18 h with bacterial lipopolysaccharide (LPS), muramyl dipeptide (MDP), <italic>Yersinia</italic>, or their appropriate combinations. PBMNs were also stimulated with monosodium urate (MSU) crystals. Cytokine levels were measured using an enzyme-linked immunosorbent assay (ELISA) and the Luminex system.</p> <p> <bold>Results:</bold> IL-1β secretion was similar from cells of the ReA group and from the HLA-B27-positive and -negative reference groups. TNF-α production from macrophages upon co-stimulation of LPS and MDP increased in the order ReA group < HLA-B27-positive reference group < HLA-B27-negative reference group (p for a trend = 0.027). Similarly, <italic>Yersinia</italic>-induced TNF-α and IL-23 production increased in the same order (p for trend for TNF-α = 0.036; p for trend for IL-23 = 0.026).</p> <p> <bold>Conclusions:</bold> PBMNs and macrophages from healthy subjects with previous ReA show normal inflammasome activation and low TNF-α and IL-23 production. This low cytokine production may impair bacterial elimination and thereby contribute to the triggering of ReA.</p> </abstract>