细胞生物学
转染
生物物理学
材料科学
缺氧(环境)
细胞内
化学
纳米技术
生物
生物化学
基因
氧气
有机化学
作者
Xiaoyu Ding,Xiaowen Xing,Jianfeng Liu,Pengchong Zhu,Cui Wang,Rui Bai,Bo Kong,Chuyang Zeng,Wei Zhang,Yulong Yin,Haitao Zhang,Jiajia Xiang,Zengqiang Yuan,Zhiqiang Liu
标识
DOI:10.1002/adfm.202301451
摘要
Abstract Myocardial ischaemia is pathologically complicated; various changes in intracellular and extracellular microenvironments make it essential to develop a smart drug system with multiple stimulus responses to adapt to the complex process. Inspired by the cobweb, this study designs a microreticular nanosystem that adheres to tissue and is sequentially responsive to multiple stimuli in the ischaemic microenvironment. The nanosystem is fabricated from hyaluronic acid (HA), ROS‐responsive B‐PDEA, and hypoxia‐sensitive VEGF‐expressing plasmids (EPODNA) through electrostatic interactions. After intramyocardial injection, the tissue‐adhesive property of the nanosystem will significantly decrease its acute loss from the injection site. Extracellularly, the microreticular nanosystem first responds to activated hyaluronidase (hyal), releasing HA for microenvironment regulation and B‐PDEA/DNA nanoparticles (NP) with high transfection efficiency for cardiac cells. Intracellularly, ROS sequentially induced B‐PDEA/DNA NP dissociation, consuming some ROS to attenuate oxidative stress and releasing DNA to promote its expression. Meanwhile, local hypoxia significantly activates VEGF expression in plasmids for myocardial revascularization and repair. The function of the microreticular nanosystem is systematically evaluated in vitro. In a rat model of myocardial infarction, treatment with the microreticular nanosystem significantly promotes functional and structural improvements. Collectively, the study provides a promising smart nanosystem to promote tissue repair after complex damage.
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