3.1. 6-Gingerol down-regulated LPS-induced cytokine production andNOS2 protein expressionTo evaluate the anti-inflammatory activity of 6-gingerol, the proteinexpression of pro-inflammatory cytokines TNF-αand IL-6 in C6 cellswas examined by ELISA. As shown inFig. 1A, 6-gingerol reduced LPS-induced TNF-αand IL-6 expression in a concentration-dependentmanner. In addition, LPS significantly increased NO production(Fig. 1B) and NOS2 protein expression (Fig. 1C) in C6 cells; these werereversed by pretreatment with 6-gingerol at 5 or 20μM.