Nanomotor-driven precision therapy for peritoneal metastasis.

Peritoneal metastasis (PM) is a terminal stage of gastrointestinal cancers, often resulting in poor survival outcomes. Traditional treatments like cytoreductive surgery (CRS) and hyperthermic intraperitoneal chemotherapy (HIPEC) have shown some effectiveness but are associated with significant risks. This study presents a novel nanomotor-based drug delivery system (M@MnO2-Au-mSiO2@CDDP) designed to enhance the efficacy of PM treatment. By utilizing an oxygen-driven heterojunction nanomotor (MnO2-Au-mSiO2), coated with membrane of M1-type macrophages, the system targets PM tumors with high precision through intraperitoneal perfusion. These biomimetic NMs promote deep tumor penetration, enhance reactive oxygen species (ROS) generation, and activate the STING pathway, a critical component in immune regulation. The catalytic properties of MnO2 within the nanomotors enhance drug permeability and retention, enabling targeted and controlled drug release. Both in vitro and in vivo experiments demonstrated the system's ability to significantly inhibit tumor growth, induce apoptosis, and activate immune responses. In addition, the synergistic effect of targeted drug delivery, catalytic therapy and immunotherapy of this system was further confirmed by constructing an in vitro gastric cancer organoid model, showing great clinical application potential. The study also confirmed excellent biocompatibility and stability, making these NMs a promising clinical tool for the treatment of PM. This research underscores the potential of nanotechnology to revolutionize cancer treatment by overcoming the limitations of traditional therapies and paving the way for future innovations in targeted cancer therapies.