Fig. 5

ROS/AMPK/mTOR pathway was required for HMGB1-mediated autophagy regulating NIS expression (a) FTC-133/TPC-1 cells transfected with HMGB1 shRNA and control shRNA transfection were starved by HBSS for 3 h and then treated with rapamycin (1 μM) for 12 h. ROS production was assessed by measuring the fluorescent intensity of DCF on a fluorescent plate reader. Incremental production of ROS was expressed as a percentage of control. Rap, rapamycin. (n = 3, *P < 0.01, **P > 0.01); (b) FTC-133/TPC-1 cells transfected with HMGB1 shRNA and control shRNA were starved by HBSS for 3 h and then treated with rapamycin (1 μM) for 12 h. Flow cytometry was performed for measuring the ROS level by a DCFH-DA probe in indicated cells. Rap, rapamycin. (n = 3, *P < 0.01, **P > 0.01); (c) FTC-133/TPC-1 cells were transfected with HMGB1 shRNA and control shRNA and then starved by HBSS for 3 h. ATP levels were detected by ATP Assay Kit (n = 3, *P > 0.01); (d) FTC-133/TPC-1 cells were pretreated with NAC (2 mM) and then starved by HBSS for 3 h. LC3-I/II, NIS, p-AMPK, AMPK, p-mTOR, mTOR, p-p70S6K and p70S6K levels were assayed by Western blot; (e) FTC-133/TPC-1 cells transfected with HMGB1 shRNA and control shRNA were starved by HBSS for 3 h and then treated with rapamycin (1 μM) for 12 h. LC3-I/II, NIS, p-mTOR and mTOR levels were assayed by Western blot. Rap, rapamycin