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Ciccia, F; Accardo-Palumbo, A; Alessandro, R; Alessandri, C; Priori, R; Guggino, G; Raimondo, S; Carubbi, F; Valesini, G; Giacomelli, R; Rizzo, A; Triolo, G
Clinical and experimental immunology, 08/2015, Letnik: 181, Številka: 2Journal Article
Summary The aim of this study was to investigate the expression of the interleukin (IL)-36 axis in patients with primary Sjögren's syndrome (pSS). Blood and minor labial salivary glands (MSG) biopsies were obtained from 35 pSS and 20 non-Sjögren's syndrome patients (nSS) patients. Serum IL-36alpha was assayed by enzyme-linked immunosorbent assay (ELISA). IL-36alpha, IL-36R, IL-36RA, IL-38, IL-22, IL-17, IL-23p19 and expression in MSGs was assessed by reverse transcription-polymerase chain reaction (RT-PCR), and tissue IL-36alpha and IL-38 expression was also investigated by immunohistochemistry (IHC). alphabeta and gammadelta T cells and CD68+ cells isolated from MSGs were also studied by flow cytometry and confocal microscopy analysis. IL-36alpha was over-expressed significantly in the serum and in the salivary glands of pSS. Salivary gland IL-36alpha expression was correlated with the expression levels of IL-17, IL-22 and IL-23p19. IL-38, that acts as inhibitor of IL-36alpha, was also up-regulated in pSS. alphabeta+ CD3+ T cells and CD68+ cells were the major source of IL-36alpha in minor salivary glands of pSS. gammadelta T cells were not significantly expanded in the salivary glands of pSS but produced more IL-17, as their percentage correlated with the focus score. Higher expression of IL-36alpha and IL-36R was also demonstrated in gammadelta T cells isolated from pSS compared to controls. In this study we demonstrate that a significant increase in circulating and tissue levels of IL-36alpha occurs in pSS patients.
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in: SICRIS
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