“…These surface antigens and mediators facilitate the progression of RA by mediating inammatory cell migration and neovascularization. 9,11,12 Second, synovial broblasts in RA might induce activated macrophages to differentiate into osteoclasts, causing severe cartilage damage. 13,14 Folate receptor b (FRb) is a receptor overexpressed on the surface of RA-activated macrophages, which could specically recognize and bind to a nanoscale drug delivery system modied with folic acid molecules (FA).…”