Restoring anti-tumor functions of T cells via nanoparticle-mediated immune checkpoint modulation

Journal of Controlled Release : Official Journal of the Controlled Release Society
Shi-Yong LiJun Wang

Abstract

The core purpose of cancer immunotherapy is the sustained activation and expansion of the tumor specific T cells, especially tumor-infiltrating cytotoxic T lymphocytes (CTLs). Currently, one of the main foci of immunotherapy involving nano-sized carriers is on cancer vaccines and the role of professional antigen presenting cells, such as dendritic cells (DCs) and other phagocytic immune cells. Besides the idea that cancer vaccines promote T cell immune responses, targeting immune inhibitory pathways with nanoparticle delivered regulatory agents such as small interfering RNA (siRNA) to the difficultly-transfected tumor-infiltrating T cells may provide more information on the utility of nanoparticle-mediated cancer immunotherapy. In this study, we constructed nanoparticles to deliver cytotoxic T lymphocyte-associated molecule-4 (CTLA-4)-siRNA (NPsiCTLA-4) and showed the ability of this siRNA delivery system to enter T cells both in vitro and in vivo. Furthermore, T cell activation and proliferation were enhanced after NPsiCTLA-4 treatment in vitro. The ability of direct regulation of T cells of this CTLA-4 delivery system was assessed in a mouse model bearing B16 melanoma. Our results demonstrated that this nanoparticle delivery ...Continue Reading

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