Measurement of GPR120, ERK, Raf and IKKβ. (A) Effect of EPA on the protein expression of GPR120 in RAW264.7 cells; (B) Effect of EPA on the protein expression of ERK1/2 in RAW264.7 cells; (C) Effect of EPA on the protein expression of Raf and IKKβ in RAW264.7 cells. Cells were treated with DMSO (equivalent volume 3.0 μM EPA, as control) or various concentrations (1.2, 1.8, 2.4 and 3.0 μmol) of EPA for 24 h. The expression of protein was analyzed by Western blot. The β-actin was used as an equal loading control (means ± SD, * p < 0.05 and ** p < 0.01 compared with the control). Each bar is representative of 6 independent experiments, and data were analyzed by ANOVA and Duncan’s multiple range tests.