Reprogramming the tumor microenvironment with oxygen-driven nanomotors for cuproptosis-enhanced immunotherapy.

Cancer immunotherapy has revolutionized the landscape of cancer treatment, particularly through the development of immune checkpoint blockade (ICB) targeting the PD-1/PD-L1 axis. However, the therapeutic efficacy of these interventions is frequently hindered by the immunosuppressive tumor microenvironment (TME), which is characterized by hypoxia, poor immune cell infiltration, and impaired antigen presentation. To overcome these barriers, MP-GCZ has been developed as a self-oxygenating biomimetic nanomotor to synergistically reprogram the TME and enhance antitumor immune responses through integrated multimodal mechanisms. This nanosystem combines photothermal therapy (PTT), cuproptosis-induced immunogenic cell death (ICD), and localized immune checkpoint modulation to address the complex immunosuppressive network of the TME. By leveraging a metal-organic framework scaffold, MP-GCZ enables controlled delivery of therapeutic components that alleviate hypoxia, trigger immunogenic tumor cell death, and enhance adaptive immune responses. When activated by near-infrared irradiation, MP-GCZ enhances dendritic cell maturation, increases infiltration of cytotoxic T lymphocytes, thereby transforming immunologically "cold" tumors into inflamed, immunogenic environments. Preclinical studies demonstrate that this strategy effectively suppresses both primary tumor growth and distant metastases, driven by systemic antitumor immunity. MP-GCZ represents a promising comprehensive approach to overcoming TME-mediated resistance and may offer a valuable solution to enhance the clinical efficacy of cancer immunotherapy.