纳米反应器
细胞内
肿瘤微环境
细胞生物学
体内
化学
癌细胞
免疫系统
生物
生物化学
免疫学
癌症
催化作用
遗传学
生物技术
作者
Ké Li,Kun Xu,Ye He,Yulu Yang,Meijun Tan,Yulan Mao,Yunling Zou,Feng Qian,Zhong Luo,Kaiyong Cai
出处
期刊:ACS Nano
[American Chemical Society]
日期:2023-03-02
卷期号:17 (5): 4667-4687
被引量:27
标识
DOI:10.1021/acsnano.2c10893
摘要
The hypoxia microenvironment of solid tumors poses a technological bottleneck for ferroptosis and immunotherapy in clinical oncology. Nanoreactors based on special physiological signals in tumor cells are able to avoid various tumor tolerance mechanisms by alleviating the intracellular hypoxia environment. Herein we reported a nanoreactor Cu2–xSe that enabled the conversion of Cu elements between Cu+ and Cu2+ for the generation of O2 and the consumption of intracellular GSH content. Furthermore, to enhance the catalytic and ferroptosis-inducing activities of the nanoreactors, the ferroptosis agonist Erastin was loaded on the ZIF-8 coating on the surface of Cu2–xSe to up-regulate the expression of NOX4 protein, increase the intracellular H2O2 content, catalyze the Cu+ to produce O2 and activate ferroptosis. In addition, the nanoreactors were simultaneously surface functionalized with PEG polymer and folic acid molecules, which ensured the in vivo blood circulation and tumor-specific uptake. In vitro and in vivo experiments demonstrated that the functionalized self-supplying nanoreactors can amplify the ability to generate O2 and consume intracellular GSH via the interconversion of Cu elements Cu+ and Cu2+, and impair the GPX4/GSH pathway and HIF-1α protein expression. At the same time, by alleviating the intracellular hypoxia environment, the expression of miR301, a gene in the secreted exosomes was decreased, which ultimately affected the phenotype polarization of TAMs and increased the content of IFN γ secreted by CD8+ T cells, which further promoted the ferroptosis induced by Erastin-loaded nanoreactors. This combined therapeutic strategy of activating the tumor immune response and ferroptosis via self-supplying nanoreactors provides a potential strategy for clinical application.
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