Radiation-induced eosinophils improve cytotoxic T lymphocyte recruitment and response to immunotherapy
Jianan Cheng, Wen Luo, Chengdu Sun, Zheng Jin, Xianghua Zeng, Peter B. Alexander, Zhihua Gong, Xin Xia, Xiaofang Ding, Shouxia Xu, Ping Zou, Yisong Y. Wan, Qingzhu Jia, Qi-Jing Li, Bo Zhu
Abstract
T cell infiltration and diminishes the anti-tumor effectiveness of radiation. Retrospectively, we identified a strong correlation between eosinophilia and survival benefit in radiation-treated cancer patients. Experimentally, we further show that radiation enhances the intratumoral infiltration of adoptive transferred T cells therapy, bolstering eosinophils by intravenous interleukin-5 administration promotes the efficacy of radiation-induced abscopal effect. Together, these results suggest that eosinophil mobilization can be considered as a mechanistically relevant biomarker for predicting the effectiveness of pre-immunotherapy radiation, as well as a new strategy to enhance T cell-mediated immunotherapy against cancers.