RESUMO
OBJECTIVE: In rheumatoid arthritis (RA) joint erosion is accompanied by T cell infiltration of the synovial tissue. The resulting T cell receptor (TCR) repertoire is a combination of antigen driven shaping, nonspecific selection by endothelial cell-T cell interactions, and cytokine mediated chemoattraction. Considering the conflicting results of molecular biology studies of the TCR repertoire in RA, we attempted to obtain new data to clarify the situation through microscopic distribution analysis of TCR beta chain diversity in synovium follicular CD4/CD8 subsets. METHODS: We used dual color fluorescence confocal microscopy with CD4/CD8 monoclonal antibodies (Mab) and a panel of new anti-V beta Mab. The analysis focussed on lymphocyte rich, follicle-like areas of synovial tissue from 4 patients with RA. RESULTS: The expression of individual TCR beta families varied between areas within the T cell follicles, and between patients. Normal absolute levels of some beta chains can be completely skewed towards one subset, indicating that overall TCR evaluation is insufficient. CONCLUSION: Confocal microscopy analysis of localized TCR diversity in RA synovium offers novel insight into overall V beta gene usage, which appears to be the accumulation of several localized microexpansions.
Assuntos
Artrite Reumatoide/metabolismo , Receptores de Antígenos de Linfócitos T alfa-beta/metabolismo , Membrana Sinovial/metabolismo , Anticorpos Monoclonais , Artrite Reumatoide/imunologia , Artrite Reumatoide/patologia , Relação CD4-CD8 , Humanos , Microscopia Confocal , Membrana Sinovial/imunologia , Membrana Sinovial/patologia , Subpopulações de Linfócitos T/imunologia , Distribuição TecidualRESUMO
Rheumatoid pericarditis (RP) is a well known extraarticular manifestation of rheumatoid arthritis (RA). It is not frequently diagnosed despite its high reported prevalence in post-mortem studies. There have been no immunohistological studies of its presence in pericardial membranes. Here we report a complete immunohistological study of two RA patients with RP complications, using a panel of monoclonal antibodies (mAbs) for the recognition of B, T, and NK cells. Both cases showed strong and almost exclusive pericardial membrane infiltration of CD8+ T-cells which was correlated with a higher than expected similar increase in the subset of peripheral blood lymphocytes (PBL). These findings suggest an important role for CD8+ T-cells in chronic RA, especially in this extraarticular manifestation of the disease.