CXCL8 and rheumatoid arthritis: IL-8, MCP-1/CCL2, RANTES/CCL5 and IP-10 also contribute to the pathogenesis of RA as chemotactic factors of neutrophils (Bickel, 1993), monocytes (Stankovic et al., 2009) or T cells (Pavkova Goldbergova et al., 2012; Antonelli et al., 2014).