Macrophage‐Capturing Self‐Assembly Photosensitizer Nanoparticles Induces Immune Microenvironment Re‐Programming and Golgi‐Responsive Immunogenic Cell Death in Head and Neck Carcinoma

Abstract Head and neck carcinoma treatment is shifted toward the combination of therapy causing immune checkpoint blockade (ICB) and immunogenic cell death. In this study, a CSFRi‐chimeric TAM CSFR+ ‐targeting extracellular vesicle (EV@CSFRi) platform is developed and designed an intracellular protoporphyrin conjugated with RVRR peptide sequence for furin‐cleavage to perform Golgi‐targeting and generating ROS (GT‐RG). The graphical abstract illustrates the self‐assembly of GT‐RG nanoparticles into nanofiber through the hydrophily of RVRR and hydrophobicity of RG, and the red line indicates the site of furin cleavage. As is shown in the Graphical abstract, the Golgi‐targeting Protoporphyrin‐RVRR platform is composed with CSFRi‐chimeric extracellular vesicles and forms the tumor‐responsive TAM‐reprogramming bilayers (GT‐RG EV @CSFRi). The GT‐RG EV @CSFRi acted as a multifunctional theranostic platform, which can induce immunogenic cell death and further help modulate TAM, thus suppressing the HNC xenograft model by combination therapy with anti‐PD‐1.