Abstract
Despite the fact that AML is the most common acute leukemia in adults, patient outcomes are poor necessitating the development of novel therapies. We identified that inhibition of Thioredoxin Reductase (TrxR) is a promising strategy for AML and report a highly potent and specific inhibitor of TrxR, S-250. Both pharmacologic and genetic inhibition of TrxR impairs the growth of human AML in mouse models. We found that TrxR inhibition leads to a rapid and marked impairment of metabolism in leukemic cells subsequently leading to cell death. TrxR was found to be a major and direct regulator of metabolism in AML cells through impacts on both glycolysis and the TCA cycle. Studies revealed that TrxR directly regulates GAPDH leading to a disruption of glycolysis and an increase in flux through the pentose phosphate pathway (PPP). The combined inhibition of TrxR and the PPP led to enhanced leukemia growth inhibition. Overall, TrxR abrogation, particularly with S-250, was identified as a promising strategy to disrupt AML metabolism.
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Acknowledgements
We thank the Proteomics facility at the Cleveland Clinic Lerner Research Institute for analysis of the mass spectrometry data. This research was supported by the Hematopoietic Biorepository and Cellular Therapy, Athymic Animal and Preclinical Therapeutics, Proteomics and Cytometry and Imaging Microscopy Shared Resources of the Case Comprehensive Cancer Center (P30CA043703). The research was also supported by the NIH grant R43CA22870 (D.N.W. and Y.H.) and VA medical center grant I01BX004995. Targeted metabolomics performed at the University of Michigan metabolomics core was supported by the NIH grant U24DK097153. This research was supported by American Cancer Society (ACS) Award 127430-RSG-15-105-01-CNE (N.P.), NIH/NCI R01CA220297 (N.P), and NIH/NCI R01CA216426 (N.P.). W81XWH-18-1-0035 and W81XWH-18-1-0084 to S.M.K.
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SK and DNW designed the studies, wrote the manuscript and analyzed the data. DNW supervised the study. SK, RL, GL, YH, NO, SAM, JVG, AR, KG, and NI performed experiments. LS analyzed DARTS data. YS and ML provided reagents and assistance with data analysis. VP, CSA, SP, SMK, NP performed metabolomics data peak integration of peak and data analysis. GPT guided the chemistry studies. VP, CSA, and NP were involved in method development for metabolites. SMK guided SP on data analysis. NP and SMK, SK and DNW edited the manuscript.
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DNW is an inventor on patents related to S-250 and his employer Case Western Reserve University is the owner of patents related to S-250. SMK is a stakeholder in NeoZenome Therapeutics Inc. No other authors have any conflicts of interest with this study.
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Karunanithi, S., Liu, R., Hou, Y. et al. Thioredoxin reductase is a major regulator of metabolism in leukemia cells. Oncogene 40, 5236–5246 (2021). https://doi.org/10.1038/s41388-021-01924-0
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DOI: https://doi.org/10.1038/s41388-021-01924-0
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