CXCL1 and rheumatoid arthritis: LMPs extracted from the joints of patients with RA induce the release of IL-6, CCL1, CCL2, and CCL5 by FLSs from the same individuals [95], and MPs obtained from Jurkat cells and U937 human promocytes induce the production of angiogenic chemokines such as CXCL1, CXCL2, CXCL3, CXCL5, and CXCL6 by FLSs from RA patients.