纳米载体
质粒
化学
肿瘤微环境
肿瘤缺氧
癌症研究
DNA
生物化学
生物
药物输送
肿瘤细胞
医学
有机化学
内科学
放射治疗
作者
Xiaolin Hou,Bin Zhang,Kai Cheng,Fang Zhang,Xiao‐Ting Xie,Wei Chen,Lin‐Fang Tan,Jin‐Xuan Fan,Bo Liu,Qiuran Xu
标识
DOI:10.1002/advs.202308349
摘要
Abstract Customizable and number‐tunable enzyme delivery nanocarriers will be useful in tumor therapy. Herein, a phage vehicle, T4‐Lox‐DNA‐Fe (TLDF), which adeptly modulates enzyme numbers using phage display technology to remodel the tumor microenvironment (TME) is presented. Regarding the demand for lactic acid in tumors, each phage is engineered to display 720 lactate oxidase (Lox), contributing to the depletion of lactic acid to restructure the tumor's energy metabolism. The phage vehicle incorporated dextran iron (Fe) with Fenton reaction capabilities. H 2 O 2 is generated through the Lox catalytic reaction, amplifying the H 2 O 2 supply for dextran iron‐based chemodynamic therapy (CDT). Drawing inspiration from the erythropoietin (EPO) biosynthetic process, an EPO enhancer is constructed to impart the EPO‐Keap1 plasmid (DNA) with tumor hypoxia‐activated functionality, disrupting the redox homeostasis of the TME. Lox consumes local oxygen, and positive feedback between the Lox and the plasmid promotes the expression of kelch ECH Associated Protein 1 (Keap1). Consequently, the downregulation of the antioxidant transcription factor Nrf2, in synergy with CDT, amplifies the oxidative killing effect, leading to tumor suppression of up to 78%. This study seamlessly integrates adaptable T4 phage vehicles with bio‐intelligent plasmids, presenting a promising approach for tumor therapy.
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