AUTHOR=Wang Xu , Hui Renjie , Chen Yun , Wang Wentao , Chen Yujiao , Gong Xiaohai , Jin Jian TITLE=Discovery of Novel Doxorubicin Metabolites in MCF7 Doxorubicin-Resistant Cells JOURNAL=Frontiers in Pharmacology VOLUME=10 YEAR=2019 URL=https://www.frontiersin.org/journals/pharmacology/articles/10.3389/fphar.2019.01434 DOI=10.3389/fphar.2019.01434 ISSN=1663-9812 ABSTRACT=

Doxorubicin (DOX) is metabolized to a variety of metabolites in vivo, which has been shown to be associated with cardiotoxicity. We speculate that metabolic processes are also present in tumor cells. A LC-MS/MS method was developed to detect intracellular metabolites. Drug resistant tumor cells with high drug stress tolerance and metabolically active are suitable as materials for this study. Our results show difference in drug metabolites between the wild-type and drug-resistant cells. Three novel doxorubicin metabolites were discovered after the LC-MS/MS analysis. All these metabolites and their profiles of metabolites are totally different from that in liver or kidney in vivo. Our results suggest that tumor cells and drug-resistant tumor cells have a unique drug metabolism pathway for doxorubicin.