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We investigated the antitumor activity of daucusol (DS) derived from Daucus carota L. in PC-3, A549 and HeLa cell lines by the MTT assay. Optical microscopy revealed that exposure of PC-3 cells to DS resulted in cytoplasmic vacuolation. Flow cytometry analysis of the phase of the cell cycle did not reveal a sub-G1 peak, and no caspase-dependent activation was observed after DS treatment. The levels of endoplasmic reticulum (ER) stress biomarkers, LC3B-II and ubiquitinated proteins were increased. It was also observed that oxidative stress played an important role in the activation of the cytoplasmic vacuolation-mediated cell-death pathway. In vivo, DS inhibited tumor growth in nude mice by 39.13% compared to the vehicle. Protein expression in the tumor tissue was consistent with their expression in vitro. Our findings indicate that DS induced cytoplasmic vacuolation-mediated death in PC-3 cells by triggering oxidative stress and suggest that targeting this pathway could serve as a novel therapeutic approach for prostate cancer

archives of biological sciences

Promotion of cytoplasmic vacuolation-mediated cell death of human prostate cancer PC-3 cells by oxidative stress induced by daucusol, a new guaiane-type sesquiterpenoid from Daucus carota L.