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Systemic lupus erythematosus (SLE) is an autoimmune disorder characterized by the involvement of multiple organ systems with alternating clinical exacerbations and remissions. Circulating immune complexes and autoantibodies can cause tissue damage and organ dysfunction with manifestations involving the skin, serosal surfaces, central nervous system, and kidneys (Rahman & Isenberg, 2008). B cells are believed to play an important role in SLE. B cells can function as APCs, produce cytokines and chemokines contributing to lymphoid regulation, and can respond to stimuli in the microenvironment at local tissues (Ramanujam & Davidson, 2008). Pathogenic autoantibodies produced by autoreactive B cells are believed to play an important role in the pathogenesis of SLE. CXCL13 has been shown to be a key mediator of organization of lymphoid tissues. CXCL13 is a B cell chemoattractant that is expressed by peritoneal macrophages and follicular dendritic cells in secondary lymphoid organs, such as the follicles of Peyer’s patches, the spleen and lymph nodes. Through interaction with CXCR5, a G-protein coupled receptor, CXCL13 attracts B lymphocytes and promotes migration of small numbers of T helper follicular cells and macrophages (Gunn et al., 1998). CXCL13 is critical for B cell homing and follicle formation in lymph node and spleen, and it is required for the development of lymph nodes and Peyer’s patches (Ansel et al., 2000). CXCL13 protein level is elevated in ectopic B cell follicles formed in the inflamed tissues of multiple chronic diseases, and plays an important role in maintaining inflammation by actively recruiting B cells (Carlsen et al., 2004; Magliozzi et al., 2004; Salolonsson et al., 2002; Shi et al., 2001;). CXCL13 has been shown to have increased expression in the thymus and kidney of aged NZB/W F1 mice, and may play a role in breaking immune tolerance in the thymus of autoimmune prone mice (Ishikawa et al., 2001). Treatment with anti-CXCL13 has shown efficacy in animal models of RA and EAE (Bagaeva et al. 2006; Zheng et al., 2005). Because of its function and presence in various pathological conditions, CXCL13 and CXCL13 dependent pathways are thought to be instrumental in the pathogenesis of a variety of diseases where B cells may play a significant role, including RA, OA, UC, and SLE, and could be potential targets for autoimmune therapy (Table 1).

Anti-CXCL13 and Anti-TNFα Monoclonal Antibodies Combinatorial Treatment Inhibits Autoimmune Disease in a Murine Model of Systemic Lupus Erythematosus