Abstract
EZH2 has been regarded as an efficient target for diffuse large B-cell lymphoma (DLBCL), but the clinical benefits of EZH2 inhibitors (EZH2i) are limited. To date, only EPZ-6438 has been approved by FDA for the treatment of follicular lymphoma and epithelioid sarcoma. We have discovered a novel EZH1/2 inhibitor HH2853 with a better antitumor effect than EPZ-6438 in preclinical studies. In this study we explored the molecular mechanism underlying the primary resistance to EZH2 inhibitors and sought for combination therapy strategy to overcome it. By analyzing EPZ-6438 and HH2853 response profiling, we found that EZH2 inhibition increased intracellular iron through upregulation of transferrin receptor 1 (TfR-1), ultimately triggered resistance to EZH2i in DLBCL cells. We demonstrated that H3K27ac gain by EZH2i enhanced c-Myc transcription, which contributed to TfR-1 overexpression in insensitive U-2932 and WILL-2 cells. On the other hand, EZH2i impaired the occurrence of ferroptosis by upregulating the heat shock protein family A (Hsp70) member 5 (HSPA5) and stabilizing glutathione peroxidase 4 (GPX4), a ferroptosis suppressor; co-treatment with ferroptosis inducer erastin effectively overrode the resistance of DLBCL to EZH2i in vitro and in vivo. Altogether, this study reveals iron-dependent resistance evoked by EZH2i in DLBCL cells, and suggests that combination with ferroptosis inducer may be a promising therapeutic strategy.
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Acknowledgements
This work was supported by grants from Program of Shanghai Academic Research Leader (22XD1404400), the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA12020233), Youth Innovation Promotion Association of Chinese Academy of Sciences (2020281) and Lingang Laboratory (LG202103-02-05). We thank Haihe Biopharma Co., Ltd. for providing HH2853.
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YC, YFF, JD, and LY designed the experiments. LY, YFW, JX, QQS, SSC, and DZL performed the research. LY and YFW analyzed the data, LY and JX wrote the paper which was revised by JD, YFF, and YC. All authors approved the final version of the paper.
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JD is the Chairman of Haihe Biopharma Co., Ltd. No competing interests is disclosed for rest of the authors.
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Yu, L., Wang, Yf., Xiao, J. et al. Dysregulation of iron homeostasis by TfR-1 renders EZH2 wild type diffuse large B-cell lymphoma resistance to EZH2 inhibition. Acta Pharmacol Sin 44, 2113–2124 (2023). https://doi.org/10.1038/s41401-023-01097-4
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DOI: https://doi.org/10.1038/s41401-023-01097-4
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