ZnPc-PEG2-VH032

ZnPc-PEG2-VH032 is a VHL-pathway-dependent photodegradation targeting chimera (PDTAC) and cytotoxic agent. ZnPc-PEG2-VH032 (HY-120217) binds to the VHL ligand domain, and then specifically degrades VHL under light irradiation, a process independent of non-specific ROS-mediated protein damage. ZnPc-PEG2-VH032 uses Zinc phthalocyanine (HY-19204) as a photosensitizer, and generates ROS via type I and type II photodynamic pathways under 680 nm LED irradiation. On one hand, it targets and degrades the bound VHL protein through ROS; on the other hand, it exerts direct photodynamic cytotoxicity. Meanwhile, the degradation of VHL downregulates the phosphorylation level of CDK2/4, induces cell cycle arrest in tumor cells, further enhances the sensitivity of tumor cells to oxidative damage caused by ROS, and achieves a synergistic anti-tumor effect. ZnPc-PEG2-VH032 exerts significant in vivo efficacy in an orthotopic mouse model of non-muscle invasive bladder cancer (NMIBC)^[1]. (Pink: Reactive Oxygen Species (ROS) ligand (HY-19204); Blue: VHL ligand (HY-120217); Black: linker).