The invention discloses targeted nano-particles TPPO NPs capable of efficiently delivering and locally controlling
oxygen release to improve the
curative effect of sonodynamic and
antibody therapy, and relates to a preparation method of multifunctional nano-particles and application of the multifunctional nano-particles in tumor diagnosis and treatment. According to the preparation method disclosed by the invention, targeting nanoparticles capable of efficiently carrying O2 are prepared by using a lipidated sound-sensitive agent, namely pyropheophorbide a lipid, distearoyl
phosphatidyl ethanolamine-
polyethylene glycol 2000, distearoyl
phosphatidyl ethanolamine-
polyethylene glycol 2000-NHS, perfluorobromooctane (PFOB) and
trastuzumab (Tra). Under the targeting effect of
trastuzumab, the nanoparticles recognize HER-2 positive gastric
cancer cells, and efficient enrichment of the nanoparticles at the HER-2 positive gastric
cancer cells is achieved together with
permeation enhancing and retention enhancing effects. Under the ultrasonic action, on one hand, the sonosensitizer generates
reactive oxygen species (ROS), and the
sonodynamic therapy effect is achieved; on the other hand, O2 carried by perfluorobromooctane PFOB in the nanoparticles can be controllably released, so that the hypoxia of tumors is relieved, and the sonodynamic and
antibody treatment effects are enhanced.