The present invention relates to a multifunctional
cascade reactive nano - scale
ultrasound contrast agent and its preparation method and application. The contrast agent (GHB - NPs) has a core of
chitosan loaded with Basigin - siRNA and modified with
hyaluronidase, and a shell membrane of
phospholipid -
polyethylene glycol - 2GSH. Perfluoropentane is encapsulated inside the shell membrane, and the particle size is 106 - 295 nm. For the GHB - NPs prepared by the present invention, DSPE - PEG2k - 2GSH on its surface can react with highly expressed γ - GGT on the surface of
tumor cells, resulting in electrostatic repulsion to
expose hyaluronidase, enabling GHB - NPs to penetrate deep into tumor tissues, and having targeting and high efficiency for the treatment of tumors. And it can be used in combination with UTMD. By inhibiting the β -
catenin / c - Myc pathway, it down - regulates
glycolysis - related proteins and reduces the production of
lactic acid and ATP, which is beneficial to the treatment of tumor diseases. And the present invention has experimentally proved that GHB - NPs + UTMD has an obvious
therapeutic effect on
melanoma model mice, and can be used for the preparation of anti - tumor drugs to achieve the integration of tumor diagnosis and treatment.