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        Single Cell Analysis of Synovial Tissue B-Cells

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        Mononuclear cells often form highly organized lymphoid structures in the chronically inflamed synovial tissue of patients with rheumatoid arthritis (RA) within which B-cells are activated and may differentiate into effector plasma cells. The analysis of those activated B-cells and the determination of their specificity is of great importance for the understanding of the pathogenesis of RA. Here, we describe a technique that combines histological analysis of synovial tissue with a molecular analysis of the Vgene repertoire at the level of the single B-cell.
        Immunohistochemical staining of tissue sections allows us to identify the activated B-cells. Those cells are then isolated using a micromanipulator and the rearranged immunoglobulin (Ig) genes amplified, cloned and sequenced. The combination of the V(D)J gene segments and the pattern of somatic mutations in the V-region genes, allows us to identify clonal relationships between the isolated B cells. Once Ig genes for a heavy and a light chain have been isolated from individual B-cells, they can be used to generate recombinant antibodies. These antibodies can be used to determine the antigens which support the activation of B-cells in the inflamed synovial tissue
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