Immunotherapy for Tumor Metastasis by Artificial Antigen-Presenting Cells via Targeted Microenvironment Regulation and T-Cell Activation

Authors：Lu, Yao^*; Li, Lihua; Du, Jingwen; Chen, Jieli; Xu, Xingyi; Yang, Xianfeng; Ding, Changhai^*; Mao, Chuanbin^*

Source：ACS applied materials & interfaces, 2021, 13(47): 55890-55901.

DOI：10.1021/acsami.1c17498

• artificial antigen-presenting cells
• nanocatalysts
• tumor microenvironment
• tumor metastasis
• immunotherapy

Effective expansion of T-cells without ex vivo stimulation and maintenance of their antitumor functions in the complex tumor microenvironment (TME) are still daunting challenges in T-cell-based immunotherapy. Here, we developed biomimetic artificial antigenpresenting cells (aAPCs), ultrathin MnOx nanoparticles (NPs) functionalized with T-cell activators (anti-CD3/CD28 mAbs, CD), and tumor cell membranes (CMs) for enhanced lung metastasis immunotherapy. The aAPCs, termed CD-MnOx@CM, not only efficiently enhanced the expansion and activation of intratumoral CD8(+) cytotoxic T-cells and dendritic cells after homing to homotypic metastatic tumors but also regulated the TME to facilitate T-cell survival through catalyzing the decomposition of intratumoral H2O2 into O-2. Consequently, the aAPCs significantly inhibited the development of lung metastatic nodules and extended the survival of a B16-F10 melanoma metastasis model, while minimizing adverse events. Our work represents a new biomaterial strategy of inhibiting tumor metastasis through targeted TME regulation and in situ T-cell-based immunotherapy.

• Institution
  浙江大学; y; 南方医科大学; 河北医科大学