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- W4206129675 abstract "Tumor-associated macrophages (TAMs), which dampen the therapeutic efficacy of cancer immunotherapy, are the key players in the immunosuppressive tumor microenvironment (TME). Therefore, reprogramming TAMs into tumoricidal M1 macrophages possesses considerable potential as a novel immunotherapy. However, the low bioavailability of polarization agents and limited accumulation of TAMs restrict their anti-tumor efficacy. In this study, we developed a polymer-based hypoxia-responsive nanocomplex to target TAMs in hypoxia for enhanced cancer immunotherapy. We synthesized a hypoxia-cleavable polymer poly(ethylene glycol)-azo-poly(l-lysine) (PEG-azo-PLL) and formulated a nanocomplex by simple mixing PEG-azo-PLL and poly(I:C). By mimicking in vitro hypoxia conditions, PEG-azo-PLL/poly(I:C) complexes could transform the physicochemical properties to enhance the delivery efficiency of poly(I:C) to tumor hypoxia, where M2-like TAMs are accumulated. Furthermore, PEG-azo-PLL/poly(I:C) could successfully reduce the population of M2-like TAMs in hypoxic tumors and promoted infiltration of CD8+ T cells in vivo, resulting in the favorable conversion of immunosuppressive TME. Finally, PEG-azo-PLL/poly(I:C) could elicit a significant in vivo anti-tumor effect in B16F10-bearing mice in addition to a prolonged survival time, demonstrating that the hypoxia-responsive nanocomplex PEG-azo-PLL/poly(I:C) is a promising approach for TAM reprogramming immunotherapy for solid tumors." @default.
- W4206129675 created "2022-01-25" @default.
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- W4206129675 date "2022-03-01" @default.
- W4206129675 modified "2023-09-26" @default.
- W4206129675 title "Immunostimulation of tumor microenvironment by targeting tumor-associated macrophages with hypoxia-responsive nanocomplex for enhanced anti-tumor therapy" @default.
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- W4206129675 doi "https://doi.org/10.1016/j.jconrel.2022.01.021" @default.
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