Original articles
Yang Gao, Jie Gao, Ganen Mu, Yumin Zhang, Fan Huang, Wenxue Zhang, Chunhua Ren, Cuihong Yang, Jianfeng Liu. Selectively enhancing radiosensitivity of cancer cells via in situ enzyme-instructed peptide selfassembly[J]. Acta Pharmaceutica Sinica B, 2020, 10(12): 2374-2383

Selectively enhancing radiosensitivity of cancer cells via in situ enzyme-instructed peptide selfassembly
Yang Gaoa, Jie Gaoa, Ganen Mua, Yumin Zhanga, Fan Huanga, Wenxue Zhangb, Chunhua Rena, Cuihong Yanga, Jianfeng Liua
a Tianjin Key Laboratory of Radiation Medicine and Molecular Nuclear Medicine, Institute of Radiation Medicine, Chinese Academy of Medical Sciences&Peking Union Medical College, Tianjin 300192, China;
b Radiation Oncology Department, Tianjin Medical University General Hospital, Tianjin 300052, China
The radiotherapy modulators used in clinic have disadvantages of high toxicity and low selectivity. For the first time, we used the in situ enzyme-instructed self-assembly (EISA) of a peptide derivative (Nap-GDFDFpYSV) to selectively enhance the sensitivity of cancer cells with high alkaline phosphatase (ALP) expression to ionizing radiation (IR). Compared with the in vitro pre-assembled control formed by the same molecule, assemblies formed by in situ EISA in cells greatly sensitized the ALPhigh-expressing cancer cells to γ-rays, with a remarkable sensitizer enhancement ratio. Our results indicated that the enhancement was a result of fixing DNA damage, arresting cell cycles and inducing cell apoptosis. Interestingly, in vitro pre-formed assemblies mainly localized in the lysosomes after incubating with cells, while the assemblies formed via in situ EISA scattered in the cell cytosol. The accumulation of these molecules in cells could not be inhibited by endocytosis inhibitors. We believed that this molecule entered cancer cells by diffusion and then in situ self-assembled to form nanofibers under the catalysis of endogenous ALP. This study provides a successful example to utilize intracellular in situ EISA of small molecules to develop selective tumor radiosensitizers.
Key words:    In situ enzyme-instructed self-assembly (EISA)    Pre-assembly    Alkaline phosphatase (ALP)    Peptide    Cancer radiotherapy    Nanofiber    Histone deacetylases inhibitor (HDACI)    Radiosensitizer   
Received: 2020-03-25     Revised: 2020-05-20
DOI: 10.1016/j.apsb.2020.07.022
Funds: This work was supported by the National Natural Science Foundation of China (81971733, 31771085 and 81722026), the CAMS Innovation Fund for Medical Sciences (CIFMS, 2016-I2M-3e022, China), the Non-profit Central Research Institute Fund of Chinese Academy of Medical Sciences (2018RC350016 and 2018PT35031, China) and the Science Foundation for Distinguished Young Scholars of Tianjin (18JCJQJC47300 and 19JCJQJC62200, China).
Corresponding author: Chunhua Ren, renchunhua@irm-cams.ac.cn;Cuihong Yang, yangcuihong@irm-cams.ac.cn;Jianfeng Liu, liujianfeng@irm-cams.ac.cn     Email:renchunhua@irm-cams.ac.cn;yangcuihong@irm-cams.ac.cn;liujianfeng@irm-cams.ac.cn
Author description:
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Yang Gao
Jie Gao
Ganen Mu
Yumin Zhang
Fan Huang
Wenxue Zhang
Chunhua Ren
Cuihong Yang
Jianfeng Liu

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