Objective To investigate the effect of Pu-erh tea extract on secretion of tumor necrosis factor-α(TNF-α) by macrophages.Methods Macrophages were differentiated from THP-1 cells after treatment with phorbol ester and used as the model of inflammatory cells,which were treated by the mixture of lipopolysaccharide(LPS) at a final concentration of 100 EU / ml with Pu-erh tea extract at various concentrations(125 and 250 μg / ml) and determined for TNF-α content in cell culture by ELISA.Results Pu-erh tea extract...