Role of mast cell activation in the development of rheumatoid arthritis

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Mast cells (MCs) harboring IgG receptor contribute to the pathogenesis of rheumatoid arthritis. IgG receptor on MCs, but not on other immune cells, is expressed as a tetramer including Fc receptor β chain (FcεRIβ). However, role of FcεRIβ in the development of rheumatoid arthritis is largely unknown. In the present study we investigated the function of FcεRIβ, a regulator of IgG receptor signaling, in rheumatoid arthritis employing an anti-type II collagen (CII) Ab-induced arthritis model. FcεRIβ-/-mice exhibited increased severity of arthritis compared with WT mice. Consistent with this observation, histopathological analyses revealed that infiltrated lymphocytes into the synovium were more increased in FcεRIβ-/- mice than in WT mice. Our findings of the present study suggest that FcεRIβ plays important roles in the regulation of inflammatory responses and that it act as an inhibitory molecule in the development of arthritis.