Co-carcinogenic effects of vitamin E in prostate.

Scientific reports (2019-08-14)
Fabio Vivarelli, Donatella Canistro, Silvia Cirillo, Alessio Papi, Enzo Spisni, Andrea Vornoli, Clara M Della Croce, Vincenzo Longo, Paola Franchi, Sandra Filippi, Marco Lucarini, Cristina Zanzi, Francesca Rotondo, Antonello Lorenzini, Silvia Marchionni, Moreno Paolini

A large number of basic researches and observational studies suggested the cancer preventive activity of vitamin E, but large-scale human intervention trials have yielded disappointing results and actually showed a higher incidence of prostate cancer although the mechanisms underlying the increased risk remain largely unknown. Here we show through in vitro and in vivo studies that vitamin E produces a marked inductive effect on carcinogen-bioactivating enzymes and a pro-oxidant status promoting both DNA damage and cell transformation frequency. First, we found that vitamin E in the human prostate epithelial RWPE-1 cell line has the remarkable ability to upregulate the expression of various phase-I activating cytochrome P450 (CYP) enzymes, including activators of polycyclic aromatic hydrocarbons (PAHs), giving rise to supraphysiological levels of reactive oxygen species. Furthermore, our rat model confirmed that vitamin E in the prostate has a powerful booster effect on CYP enzymes associated with the generation of oxidative stress, thereby favoring lipid-derived electrophile spread that covalently modifies proteins. We show that vitamin E not only causes DNA damage but also promotes cell transformation frequency induced by the PAH-prototype benzo[a]pyrene. Our findings might explain why dietary supplementation with vitamin E increases the prostate cancer risk among healthy men.

Product Number
Product Description

N-Chlorosuccinimide, 98%