Objective To observe the effects of plumbagin on proliferation and the expressions of tumor necrosis factor-α( TNF-α),interleukin-1β( IL-1β) and matrix metalloproteinase-3( MMP-3) in fibroblast-like synoviocytes( FLS) induced by lipopolysaccharide( LPS). Methods Using typeⅡ collagen and Freund's complete adjuvant to make arthritis model in rat. CIA-FLS were primary cultured in vitro,the effect of drug on proliferation of CIA-FLS was detected by MTT method. CIA-FLS were divided into CIA control group,LPS con...