Insights Into the Mechanism of Anticancer Drug Imatinib Revealed Through Multi-Omic Analyses in Yeast.

Abstract

Imatinib mesylate is a receptor tyrosine kinase inhibitor drug with broad applications in cancer therapeutics, for example, in chronic myeloid leukemia and gastrointestinal stromal tumors. In this study, new multi-omics findings in yeast on the mechanism of imatinib are reported, using the model organism Saccharomyces cerevisiae. Whole-genome analysis of the transcriptional response of yeast cells following long-term exposure to imatinib, flux-balance analysis (FBA), and modular analysis of protein/protein interaction network consisting of proteins encoded by differentially expressed genes (DEGs) were performed. DEGs indicated that carbon, nitrogen, starch, sucrose, glyoxylate/dicarboxylate metabolism, valine and leucine degradation, and tricarboxylic acid cycle (TCA) were significantly upregulated. By contrast, ribosome biogenesis, pentose/glucuronate interconversion, tryptophan/pyruvate metabolic pathways, and meiosis were significantly downregulated. FBA revealed that a large set of metabolic pathways was altered by imatinib to compensate cancer-associated metabolic changes. Integration of transcriptome and interactome (protein/protein interactions) data helped to identify the core regulatory genes and pathways through elucidation of the active subnetworks. It appears that imatinib may also contribute to antitumoral immune response in the tumor microenvironment and most of the metabolic rearrangements are at posttranscriptional level. Furthermore, additional support for possible contribution of thiamine/pyridoxal phosphate biosynthesis and mitogen-activated protein kinase pathway to drug resistance is noted. This report advances multi-omics understanding of the mechanism of imatinib, and by extension, offers new molecular avenues toward precision medicine and discovery of novel drug targets in cancer therapeutics.