PT  - JOURNAL ARTICLE
AU  - Estefanía Armas-González
AU  - Ana Díaz-Martín
AU  - María Jesús Domínguez-Luis
AU  - María Teresa Arce-Franco
AU  - Ada Herrera-García
AU  - María Vanesa Hernández-Hernández
AU  - Sagrario Bustabad
AU  - Alicia Usategui
AU  - José L. Pablos
AU  - Juan D. Cañete
AU  - Federico Díaz-González
TI  - Differential Antigen-presenting B Cell Phenotypes from Synovial Microenvironment of Patients with Rheumatoid and Psoriatic Arthritis
AID  - 10.3899/jrheum.141577
DP  - 2015 Oct 01
TA  - The Journal of Rheumatology
PG  - 1825--1834
VI  - 42
IP  - 10
4099  - http://www.jrheum.org/content/42/10/1825.short
4100  - http://www.jrheum.org/content/42/10/1825.full
SO  - J Rheumatol2015 Oct 01; 42
AB  - Objective. To study the qualitative and quantitative phenotypic changes that occur in molecules involved in antigen presentation and costimulation in synovial B cells from rheumatoid arthritis (RA) and psoriatic arthritis (PsA).Methods. The presence of HLA-DR, CD86, and CD40 in CD20+ cells was studied in RA synovium biopsies using immunohistochemistry and immunofluorescence. Expression was assessed by flow cytometry of the Class II molecules CD40, CD86, CD23, and CD27 on B cells from the synovial fluid (SF), with respect to peripheral blood, from 13 patients with RA and 15 patients with PsA. Expression of interferon-induced protein with tetratricopeptide repeats 4 (IFIT4) in immune-selected CD20+ cells from patients with RA was assessed by quantitative realtime PCR.Results. Infiltrating synovial RA, B cells expressed HLA-DR, CD40, and CD86. Increased expression of CD86, HLA-DR, and HLA-DQ in B cells from SF was found in patients with RA and PsA. HLA-DP was also elevated in rheumatoid SF B cells; conversely, a significantly lower expression was observed in SF from patients with PsA. CD40 expression was increased in SF B cells from PsA, but not in patients with RA. Interestingly, CD20 surface expression level was significantly lower in SF B cells (CD19+, CD138−) from RA, but not in patients with PsA. CD27 upregulation and CD23 downregulation were observed in synovial B cells in both pathologies. Finally, a 4-fold increase in IFIT4 mRNA content was shown in B cells from SF in patients with RA.Conclusion. Synovial B cells from patients with RA and patients with PsA express different antigen-presenting cell phenotypes, suggesting that this cell type plays a dissimilar role in the pathogenesis of each disease.