Journal
ACS NANO
Volume 16, Issue 4, Pages 5778-5794Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c10892
Keywords
nanomicelles; rod-like microparticle; active targeting internalization; immunotherapy
Categories
Funding
- National Key R&D Program of China [2021YFB3800900]
- National Natural Science Foundation of China [51725303, 51703189, 51903214, 52033007]
- Sichuan Science and Technology Program [2019YJ0245, 2020YFSY0017]
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In this study, a localized drug delivery system based on a hierarchical-structured fiber device was developed to precisely reprogram tumor-associated macrophages (TAMs) and combine them with immunogenic cell death (ICD), aiming to enhance the antitumor immunotherapeutic effect.
How to precisely reprogram tumor-associated macrophages (TAMs) and combine them with immunogenic cell death (ICD) is still a great challenge in enhancing the antitumor immunotherapeutic effect. Here, we developed a localized drug delivery system with a step-by-step cell internalization ability based on a hierarchical-structured fiber device. The chemotherapeutic agent-loaded nanomicelles are encapsulated in the internal chambers of the fiber, which could first be internalized by actively targeting tumor cells to induce ICD. Next, the rod-like microparticles can be gradually formed from long to short shape through hydrolysis of the fiber matrix in the tumor microenvironment and selectively phagocytosed by TAMs but not to tumor cells when the length becomes less than 3 mu m. The toll-like receptors 7 (TLR7) agonist imiquimod could be released from these microparticles in the cytoplasm to reprogram M2-like TAMs. The in vivo results exhibit that this localized system can synergistically induce an antitumor immune response and achieve an excellent antitumor efficiency. Therefore, this system will provide a promising treatment platform for cancer immunotherapy.
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