The effect of 3-MC on ARA metabolism in Dami cells. Dami cells were treated with 10 μM 3-MC for 72 h. The control group of Dami cells received the same final volume of the solvent (DMSO) without 3-MC. After 3-MC treatment, 3-MC-treated Dami cells were divided into two groups. One group of Dami cells (1 × 106 cells) was incubated with 100 μM ARA for 12 h. The other group received 40 μM of SKF-525A in addition to ARA. ARA metabolites, 14,15-EET (A), 14,15-DHET (B), and 20-HETE (C) were identified by LC-MS/MS after liquid/liquid extraction by ethyl acetate. Further details are described in the “Materials and Methods” section. The internal standard utilized was 20-HETE-6 (100 μg/ml). Statistically significant differences as compared with the DMSO treatment group are indicated as *P < 0.05, **P < 0.01, and ***P < 0.001, based on two-tailed Student’s t tests. Data are presented as the mean ± S.D. of reactions performed in triplicate.