Abstract
Programmed cell death ligand 1 (PD-L1) interacts with programmed cell death protein-1 (PD-1) as an immune checkpoint. Reactivating the immune response by inhibiting PD-L1 using therapeutic antibodies provides substantial clinical benefits in many, though not all, melanoma patients. However, transcriptional suppression of PD-L1 expression as an alternative therapeutic anti-melanoma strategy has not been exploited. Here we provide biochemical evidence demonstrating that ultraviolet radiation (UVR) induction of PD-L1 in skin is directly controlled by nuclear factor E2-related transcription factor 2 (NRF2). Depletion of NRF2 significantly induces tumor infiltration by both CD8+ and CD4+ T cells to suppress melanoma progression, and combining NRF2 inhibition with anti-PD-1 treatment enhanced its anti-tumor function. Our studies identify a critical and targetable PD-L1 upstream regulator and provide an alternative strategy to inhibit the PD-1/PD-L1 signaling in melanoma treatment.
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Acknowledgements
We thank Drs. Wenshu Wu and Rui He for carefully reading and suggestions. This work was supported by the National Institutes of Health (RC: R01CA137098, R01CA193913 and R01CA196896), Melanoma Research Foundation Establish Investigator Award (RC), Hong Kong, Macao Young Scientists of the National Natural Science Foundation of China (Grant No.81428025 for RC) and National Natural Science Foundation of China (81630106), and the Priority Academic Program Development of Jiangsu Higher Education Institutions (Integration of Chinese and Western Medicine) grant (PC). National Natural Science Foundation of China (31771619) for HH. The National Natural Science Foundation of China (Grant No. 81673977 for 2016 for XM). RC is an American Cancer Society Research Scholar.
Author contributions
BZ, LT, SC, and CY performed most of the experiments with assistance from SP, XL, TL, WL, CH, LS, ZX, GZ, XC, and XG. PC, RC, and NX designed and supervised the experiments. RC, NX, and PC wrote the manuscript with assistance from CG.
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These authors contributed equally: Bo Zhu, Liming Tang, Shuyang Chen, Chengqian Yin.
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Zhu, B., Tang, L., Chen, S. et al. Targeting the upstream transcriptional activator of PD-L1 as an alternative strategy in melanoma therapy. Oncogene 37, 4941–4954 (2018). https://doi.org/10.1038/s41388-018-0314-0
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DOI: https://doi.org/10.1038/s41388-018-0314-0
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