Discovery of Potent Small-Molecule USP8 Inhibitors for the Treatment of Breast Cancer through Regulating ER? Expression.

Ubiquitin-specific protease 8 (USP8), belonging to the deubiquitinase family, has been implicated to be closely related to the occurrence of many malignant tumors, but only a few USP8-targeting inhibitors have been reported to date. In this study, we present virtual screening to discover novel hit candidates that inhibit the catalytic ...
activity of USP8. Exploration of the structure-activity relationship led to the identification of compound DC-U4106, which binds to USP8 with a KD value of 4.7 ?M and is selective over USP2 and USP7. Western blotting and immunoprecipitation showed that DC-U4106 could target the ubiquitin pathway and facilitate the degradation of ER?. In a xenograft tumor model, DC-U4106 also significantly inhibited tumor growth with minimal toxicity. Overall, our findings suggest that DC-U4106 is a promising drug candidate and targeting the USP8-ER? complex could be a new approach to treat ER-positive or drug-resistant breast cancer.
Mesh Terms:
Breast Neoplasms, Endopeptidases, Endosomal Sorting Complexes Required for Transport, Estrogen Receptor alpha, Female, Humans, Ubiquitin, Ubiquitin Thiolesterase, Ubiquitin-Specific Peptidase 7
J Med Chem
Date: Dec. 14, 2021
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