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STAT3/p53 pathway activation disrupts IFN-β–induced dormancy in tumor-repopulating cells
Yuying Liu, … , F. Xiao-Feng Qin, Bo Huang
Yuying Liu, … , F. Xiao-Feng Qin, Bo Huang
Published February 12, 2018
Citation Information: J Clin Invest. 2018;128(3):1057-1073. https://doi.org/10.1172/JCI96329.
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Research Article Immunology

STAT3/p53 pathway activation disrupts IFN-β–induced dormancy in tumor-repopulating cells

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Abstract

Dynamic interaction with the immune system profoundly regulates tumor cell dormancy. However, it is unclear how immunological cues trigger cancer cell–intrinsic signaling pathways for entering into dormancy. Here, we show that IFN-β treatment induced tumor-repopulating cells (TRC) to enter dormancy through an indolamine 2,3-dioxygenase/kynurenine/aryl hydrocarbon receptor/p27–dependent (IDO/Kyn/AhR/p27-dependent) pathway. Strategies to block this metabolic circuitry did not relieve dormancy, but led to apoptosis of dormant TRCs in murine and human melanoma models. Specifically, blocking AhR redirected IFN-β signaling to STAT3 phosphorylation through both tyrosine and serine sites, which subsequently facilitated STAT3 nuclear translocation and subsequent binding to the p53 promoter in the nucleus. Upregulation of p53 in turn disrupted the pentose phosphate pathway, leading to excessive ROS production and dormant TRC death. Additionally, in melanoma patients, high expression of IFN-β correlated with tumor cell dormancy. Identification of this mechanism for controlling TRC dormancy by IFN-β provides deeper insights into cancer-immune interaction and potential new cancer immunotherapeutic modalities.

Authors

Yuying Liu, Jiadi Lv, Jinyan Liu, Xiaoyu Liang, Xun Jin, Jing Xie, Le Zhang, Degao Chen, Roland Fiskesund, Ke Tang, Jingwei Ma, Huafeng Zhang, Wenqian Dong, Siqi Mo, Tianzhen Zhang, Feiran Cheng, Yabo Zhou, Qingzhu Jia, Bo Zhu, Yan Kong, Jun Guo, Haizeng Zhang, Zhuo-Wei Hu, Xuetao Cao, F. Xiao-Feng Qin, Bo Huang

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