Design, Synthesis, and Biological Evaluation of Hydrophobic-Tagged Glutathione Peroxidase 4 (GPX4) Degraders.

[Display omitted] • A class of hydrophobically tagged molecules as the first examples of HyT-based GPX4 degraders were identified. • 7b effectively induces dose- and time-dependent degradation of GPX4 protein with a DC 50 value of 58 nM. • 7b degrades GPX4 through both the ubiquitin–proteasome and the autophagy-lysosome. • 7b potently suppresses the growth of human fibrosarcoma HT1080 cells. • 7b could significantly increase the accumulation of lipid ROS in HT1080 cells, ultimately leading to ferroptosis. Ferroptosis is an iron-dependent form of oxidative cell death induced by lipid peroxidation accumulation. Glutathione peroxidase 4 (GPX4) plays a key role in the regulation of ferroptosis and is considered to be a promising therapeutic target for cancer and other human diseases. Herein, we describe our design, synthesis, and biological evaluation of a series of HyT-based degraders of the GPX4. One of the most promising compounds, 7b (ZX782), effectively induces dose- and time-dependent degradation of GPX4 protein and potently suppresses the growth of human fibrosarcoma HT1080 cells, which are highly sensitive to ferroptosis and widely used for evaluating compound specificity in ferroptosis. Mechanism investigation indicated that 7b depletes GPX4 through both the ubiquitin–proteasome and the autophagy-lysosome. Furthermore, the degradation of GPX4 induced by 7b could significantly increase the accumulation of lipid reactive oxygen species (ROS) in HT1080 cells, ultimately leading to ferroptosis. Overall, compound 7b exhibits robust potency in depleting endogenous GPX4, thereby modulating ferroptosis in cancer cells. [ABSTRACT FROM AUTHOR]