Suke Deng, Jiacheng Wang, Yan Hu, Yajie Sun, Xiao Yang, Bin Zhang, Yue Deng, Wenwen Wei, Zhanjie Zhang, Lu Wen, You Qin, Fang Huang, Yuhan Sheng, Chao Wan, Kunyu Yang
Radiotherapy (RT) is used for over 50% of cancer patients and can promote adaptive immunity against tumour antigens. However, the underlying mechanisms remain unclear. Here, we discovered that RT induces the release of irradiated tumour cell-derived microparticles (RT-MPs), which significantly upregulate MHC-I expression on the membranes of non-irradiated cells, enhancing the recognition and killing of these cells by T cells. Mechanistically, RT-MPs induce DNA double-strand breaks (DSB) in tumour cells, activating the ATM/ATR/CHK1-mediated DNA repair signalling pathway, and upregulating MHC-I expression...
April 24, 2024: Cancer Letters