Metabolomic profiling to evaluate the efficacy of proxalutamide, a novel androgen receptor antagonist, in prostate cancer cells

SummaryProxalutamide is a newly developed androgen receptor (AR) antagonist for the treatment of castration-resistant prostate cancer (PCa) that has entered phase III clinical trials. In the present study, we intended to elucidate the antitumor efficacy of proxalutamide through the metabolomic profiling of PCa cells. Two AR-positive PCa cell lines and two AR-negative PCa cell lines were investigated. Cell viability assays based on ATP quantitation were conducted. LC-Q/TOF-MS was used to analyze intracellular metabolites before or after the administration of proxalutamide and two other clinical AR antagonists (bicalutamide and enzalutamide). The results of this study showed that the inhibitory effect of proxalutamide on PCa cell proliferation was better than that of bicalutamide and enzalutamide, and proxalutamide preferentially affected AR-positive PCa cells over AR-negative cells. The metabolic composition of PCa cells changed significantly after proxalutamide administration, and these changes in response to proxalutamide were significantly different from those in the presence of the two other AR antagonists. In AR-positive cells, proxalutamide significantly decreased the intracellular levels of glutamine, glutamate, glutathione, cysteine, glycine, aspartate, uridine, cytidine and thymidine. However, the effects of the two other antagonists on these discriminant metabolites were ambiguous, and no changes in these metabolites were found in AR-negative cells. Our findings indi...

Source: Investigational New Drugs - January 31, 2020 Category: Drugs & Pharmacology Source Type: research