Biomimetic liposomes synergize with high-intensity focused ultrasound to induce ferroptosis in tumors

The efficient targeted delivery and on-demand release of nanomedicines still present significant challenges in tumor therapy. In the present study, we developed a novel strategy of tumor ferroptosis therapy through the synergistic effect of nanomedicines (biomimetic liposomes) and a medical device (high-intensity focused ultrasound, HIFU). It was found that HIFU irradiation induced heightened expressions of CD44 and reactive oxygen species (ROS) in tumor cells by 1.43-fold and 2.64-fold, respectively. This allowed the gambogic acid-loaded, platelet-mimicking liposomes (PLip) to more precisely target the tumor cells through the interaction of CD44 and P-selectin on the PLip and subsequently ROS-responsively release the drug from PLip, thus effectively killing tumor cells. Crucially, gambogic acid also significantly enhanced ROS production, leading to lipid peroxidation and augmented ferroptosis induced by HIFU. In summary, HIFU demonstrates immense potential in synergizing with nanomedicines to combat tumors.