MMP3 and rheumatoid arthritis: miR-17-92 was down-regulated in activated fibroblast-like synoviocytes (FLS) isolated from RA patients, and miR-19a and miR-19b-1 regulate Toll- like receptor 2 (TLR2) expression thereby reducing the inflammatory response induced by bacterial lipoprotein (BLP) in FLS and which is characterized by the secretion of IL-6 and Matrix metalloproteinases (MMP-3) 4, 11.