Immunotherapy is recognized as one of the most promising approaches to treat
cancers. However, its effect in
glioblastoma (GBM) treatment is insufficient, which can in part be attributed to the immunosuppressive tumor microenvironment (TME). Microglia and macrophages are the main immune infiltrating cells in the TME of GBM. Unfortunately, instead of initiating the anti-
tumor response, GBM-infiltrating microglia and macrophages switch to a
tumor-promoting phenotype (M2), and support
tumor growth, angiogenesis, and immunosuppression by the release of
cytokines. In this work, a virus-mimicking membrane-coated
nucleic acid nanogel Vir-Gel embedded with therapeutic
miRNA is developed, which can reprogram microglia and macrophages from a pro-invasive M2 phenotype to an anti-
tumor M1 phenotype. By mimicking the
virus infection process, Vir-Gel significantly enhances the targetability and cell uptake efficiency of the miR155-bearing
nucleic acid nanogel. In vivo evaluations demonstrate that Vir-Gel apparently prolongs the circulation lifetime of miR155 and endows it with an active
tumor-targeting capability and excellent
tumor inhibition efficacy. Owing to its noninvasive feature and effective delivery capability, the virus-mimicking
nucleic acid nanogel provides a general and convenient platform that can successfully treat a wide range of diseases.