Tumor Cell Membrane‐Coated Liquid Metal Nanovaccine for Tumor Preventionǂ

Summary of main observation and conclusion Herein, we report on a tumor nanovaccine LMNP@CM that enhances the process of antigen‐presenting by stimulating the immune system to uptake tumor antigens actively. The nanovaccine is comprised of polyethylene glycol modified liquid metal nanoparticles (LMNP) and tumor cell membranes (CM) as antigens. Under 808 nm irradiation, the photothermal conversion effect of injected LMNP can cause mild local inflammation, and subsequently induces antigen‐presenting cells active recruitment and facilitates cellular uptake of tumor antigens. Meanwhile, because of the immune adjuvant effect of metal materials, the nanovaccine LMNP@CM promotes the maturation and activation of antigen‐presenting cells and induces anti‐tumor immune response effectively. By priming the host immune recognition of tumor antigens, this nanovaccine displays prophylactic effects and significantly suppresses tumor growth in a mouse breast tumor model. The nanovaccine LMNP@CM represents a novel strategy of utilizing light‐controlled means to actively induce anti‐tumor immune processes, showing advanced therapeutic potentials and robust adaptability for treating multiple tumors by changing the loaded antigens.