Abstract

Objective To observe the effects of berberine (BBR) on expression of inflammatory cytokines in THP-1 cells induced by lipopolysaccharide (LPS),and investigate the anti-inflammatory effects of BBR.Methods For analysing the toxicity of BBR on THP-1 cells,THP-1 cells were divided into control group,and different concentrations of BBR groups (BBR 5,10,20,50 μmol/L).After incubation for 6,24 and 48 hours,lactate dehydrogenase (LDH) released from THP-1 cells was used to assay the cytotoxicity of BBR.For analysis of the effects of BBR on inflammatory cytokines induced by LPS in THP-1 cells,THP-1 cells were divided into control group,LPS group (1 μg/mL LPS),and different concentrations of BBR with LPS groups (BBR 5,10 and 20 μmol/L + 1 μg/mL LPS).After 6,24 or 48 hours of incubation,the concentrations of inter4eukin (IL)-1 β,IL-6,IL-8 and tumor necrosis factor(TNF)-α in the culture medium were measured by enzyme-linked immunosorbent assay (ELISA).Results The survival rates of THP-1 cells were all over 90％after treated with BBR lower than 20 μmol/L for 6,24 and 48 hours.BBR decreased the release of IL-1β,IL-6,IL-8 and TNF-α from THP-1 cells in a dose-dependent manner.After 6 hours,20 μmol/L of BBR decreased the secretion of IL-1 β,IL-8 and TNF-α significantly compared with LPS group (P ＜ 0.05).After 24 hours,the secretion of IL-8 and TNF-α was decreased significantly in 20 μmol/L of BBR + LPS group compared with those in LPS group (P ＜ 0.05).After 48 hours,the secretion of TNF-α was decreased signifi-cantly (F=92.625,P ＜ 0.05) in 5 μmol/L BBR + LPS group,the secrection of IL-1β、IL-6 and TNF-α were decreased (all P ＜ 0.05) in 10 μmol/L BBR + LPS group,and the secretion of IL-1β,IL-6 and TNF-α were decreased in 20 μmol/L BBR + LPS group compared with those in LPS group (all P ＜ 0.05).Conclusion BBR can decrease the secretion of inflammatory cytokines in THP-1 cells induced by LPS in a dose-dependent manner. Key words: Berberine; THP-1 cells; Lipopolysaccharide; Inflammatory cytokines

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