Metabolic Characterization of Antifolate Responsiveness and Non-responsiveness in Malignant Pleural Mesothelioma Cells.

Front Pharmacol 2018 12;9:1129. Epub 2018 Oct 12.

Tsuruoka Metabolomics Laboratory, National Cancer Center, Tsuruoka, Japan.

Antifolates are a class of drugs effective for treating malignant pleural mesothelioma (MPM). The majority of antifolates inhibit enzymes involved in purine and pyrimidine synthesis such as dihydrofolate reductase (DHFR), thymidylate synthase (TYMS), and glycinamide ribonucleotide formyltransferase (GART). In order to select the most suitable patients for effective therapy with drugs targeting specific metabolic pathways, there is a need for better predictive metabolic biomarkers. Antifolates can alter global metabolic pathways in MPM cells, yet the metabolic profile of treated cells has not yet been clearly elucidated. Here we found that MPM cell lines could be categorized into two groups according to their sensitivity or resistance to pemetrexed treatment. We show that pemetrexed susceptibility could be reversed and DNA synthesis rescued in drug-treated cells by the exogenous addition of the nucleotide precursors hypoxanthine and thymidine (HT). We observed that the expression of pemetrexed-targeted enzymes in resistant MPM cells was quantitatively lower than that seen in pemetrexed-sensitive cells. Metabolomic analysis revealed that glycine and choline, which are involved in one-carbon metabolism, were altered after drug treatment in pemetrexed-sensitive but not resistant MPM cells. The addition of HT upregulated the concentration of inosine monophosphate (IMP) in pemetrexed-sensitive MPM cells, indicating that the nucleic acid biosynthesis pathway is important for predicting the efficacy of pemetrexed in MPM cells. Our data provide evidence that may link therapeutic response to the regulation of metabolism, and points to potential biomarkers for informing clinical decisions regarding the most effective therapies for patients with MPM.

Download full-text PDF

Source
https://www.frontiersin.org/article/10.3389/fphar.2018.01129
Publisher Site
http://dx.doi.org/10.3389/fphar.2018.01129DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6194193PMC
October 2018

Publication Analysis

Top Keywords

mpm cells
20
cells
9
malignant pleural
8
metabolic pathways
8
resistant mpm
8
mpm
8
pleural mesothelioma
8
metabolic
5
addition nucleotide
4
nucleotide precursors
4
precursors hypoxanthine
4
exogenous addition
4
cells exogenous
4
metabolomic analysis
4
rescued drug-treated
4
drug-treated cells
4
hypoxanthine thymidine
4
thymidine observed
4
lower pemetrexed-sensitive
4
pemetrexed-targeted enzymes
4

Similar Publications