AMPK acts as an upstream mediator of Nrf2 activation during β-HIVS-regulated macrophage polarization. (A) RAW 264.7 cells were incubated with 1 μM β-HIVS for different time periods, and Western blot analysis was conducted to detect the levels of p-AMPKα (Thr-172) and AMPKα. *p < 0.05 compared with the ‘0 h’ group. (B–F) The macrophages were incubated with 1 μM β-HIVS alone or combined with CC (Compound C, 10 μM, 30 min earlier) for 1 h, followed by 100 ng/mL LPS for another 3 h (B,C) or 24 h (D–F). After treatment, Western blot analysis was used to detect the levels of p-AMPKα/AMPKα (B), nuclear Nrf2 (C), HO-1, and NQO-1 (D). $p < 0.05, #p < 0.05, △p < 0.05, and *p < 0.05 vs. the control, β-HIVS alone, LPS alone, and LPS + β-HIVS groups, respectively. Real-time PCR assay (E) and flow cytometry assay (F) were performed to examine the changes in macrophage polarization, respectively. $p < 0.05, #p < 0.05, and *p < 0.05 vs. the control, LPS alone, and LPS + β-HIVS groups, respectively.