CPUL1, a TrxR inhibitor, exhibits proliferation-inhibitory and anti-metastatic effects on A549 cells by modulating epithelial-mesenchymal transition (EMT) through the induction of ROS-mediated ERK/JNK signaling, achieved by inhibiting TrxR1 enzyme activity. The efficacy of CPUL1 is enhanced when used in conjunction with α-Lipoic Acid or Dithiodipropionic acid [1].