Abstract
Purpose
Tumor cells are dependent on the glutathione and thioredoxin antioxidant pathways to survive oxidative stress. Since the essential amino acid methionine is converted to glutathione, we hypothesized that methionine restriction (MR) would deplete glutathione and render tumors dependent on the thioredoxin pathway and its rate-limiting enzyme thioredoxin reductase (TXNRD).
Methods
Triple (ER/PR/HER2)-negative breast cancer (TNBC) cells were treated with control or MR media and the effects on reactive oxygen species (ROS) and antioxidant signaling were examined. To determine the role of TXNRD in MR-induced cell death, TXNRD1 was inhibited by RNAi or the pan-TXNRD inhibitor auranofin, an antirheumatic agent. Metastatic and PDX TNBC mouse models were utilized to evaluate in vivo antitumor activity.
Results
MR rapidly and transiently increased ROS, depleted glutathione, and decreased the ratio of reduced glutathione/oxidized glutathione in TNBC cells. TXNRD1 mRNA and protein levels were induced by MR via a ROS-dependent mechanism mediated by the transcriptional regulators NRF2 and ATF4. MR dramatically sensitized TNBC cells to TXNRD1 silencing and the TXNRD inhibitor auranofin, as determined by crystal violet staining and caspase activity; these effects were suppressed by the antioxidant N-acetylcysteine. H-Ras-transformed MCF-10A cells, but not untransformed MCF-10A cells, were highly sensitive to the combination of auranofin and MR. Furthermore, dietary MR induced TXNRD1 expression in mammary tumors and enhanced the antitumor effects of auranofin in metastatic and PDX TNBC murine models.
Conclusion
MR exposes a vulnerability of TNBC cells to the TXNRD inhibitor auranofin by increasing expression of its molecular target and creating a dependency on the thioredoxin pathway.
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Data availability
The data from this study are available from the corresponding author upon request. Additional data are available in Supplementary Data.
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Acknowledgements
We are indebted to Drs. Nobunao Wakabayashi and Craig Thompson for providing MEFs, Dr. Vadim Pokrovsky for providing methioninase, and to Dr. Mark Burkard, Dr. Dudley Lamming and members of the Cryns lab for their critical reading of the manuscript.
Funding
This work was supported by grants from the Breast Cancer Research Foundation (VLC), V Foundation for Cancer Research (VLC), Wisconsin Partnership Program (VLC), and P30CA14520 core facility support.
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Malin, D., Lee, Y., Chepikova, O. et al. Methionine restriction exposes a targetable redox vulnerability of triple-negative breast cancer cells by inducing thioredoxin reductase. Breast Cancer Res Treat 190, 373–387 (2021). https://doi.org/10.1007/s10549-021-06398-y
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DOI: https://doi.org/10.1007/s10549-021-06398-y