1. TLR3 activation enhances abscopal effect of radiotherapy in HCC by promoting tumor ferroptosis
- Author
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Liman Qiu, Hongbing Ji, Kai Wang, Wenhan Liu, Qizhen Huang, Xinting Pan, Honghao Ye, Zhenli Li, Geng Chen, Xiaohua Xing, Xiuqing Dong, Ruijing Tang, Haipo Xu, Jingfeng Liu, Zhixiong Cai, and Xiaolong Liu
- Subjects
Poly(I:C) ,Hepatocellular Carcinoma ,Radiotherapy ,Abscopal Effect ,Ferroptosis ,Medicine (General) ,R5-920 ,Genetics ,QH426-470 - Abstract
Abstract Radiotherapy (RT) has been reported to induce abscopal effect in advanced hepatocellular carcinoma (HCC), but such phenomenon was only observed in sporadic cases. Here, we demonstrated that subcutaneous administration of Toll-like receptor 3 (TLR3) agonist poly(I:C) could strengthen the abscopal effect during RT through activating tumor cell ferroptosis signals in bilateral HCC subcutaneous tumor mouse models, which could be significantly abolished by TLR3 knock-out or ferroptosis inhibitor ferrostatin-1. Moreover, poly(I:C) could promote the presentation of tumor neoantigens by dendritic cells to enhance the recruitment of activated CD8+ T cells into distant tumor tissues for inducing tumor cell ferroptosis during RT treatment. Finally, the safety and feasibility of combining poly(I:C) with RT for treating advanced HCC patients were further verified in a prospective clinical trial. Thus, enhancing TLR3 signaling activation during RT could provide a novel strategy for strengthening abscopal effect to improve the clinical benefits of advanced HCC patients.
- Published
- 2024
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