Abstract
Inhibitors of the Hsp90 molecular chaperone are showing considerable promise as potential chemotherapeutic agents for cancer. Here, we describe the structure-based design, synthesis, structure-activity relationships and pharmacokinetics of potent small-molecule inhibitors of Hsp90 based on the 4,5-diarylisoxazole scaffold. Analogues from this series have high affinity for Hsp90, as measured in a fluorescence polarization (FP) competitive binding assay, and are active in cancer cell lines where they inhibit proliferation and exhibit a characteristic profile of depletion of oncogenic proteins and concomitant elevation of Hsp72. Compound 40f (VER-52296/NVP-AUY922) is potent in the Hsp90 FP binding assay (IC50 = 21 nM) and inhibits proliferation of various human cancer cell lines in vitro, with GI50 averaging 9 nM. Compound 40f is retained in tumors in vivo when administered i.p., as evaluated by cassette dosing in tumor-bearing mice. In a human colon cancer xenograft model, 40f inhibits tumor growth by approximately 50%.
Original language | English |
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Pages (from-to) | 196-218 |
Number of pages | 23 |
Journal | J Med Chem |
Volume | 51 |
Issue number | 2 |
DOIs | |
Publication status | Published - 24 Jan 2008 |
Keywords
- Animals
- Antineoplastic Agents
- Binding, Competitive
- Cell Line, Tumor
- Cell Proliferation
- Crystallography, X-Ray
- Drug Screening Assays, Antitumor
- Fluorescence Polarization
- HSP90 Heat-Shock Proteins
- Humans
- Isoxazoles
- Mice
- Mice, Nude
- Models, Molecular
- Neoplasm Transplantation
- Resorcinols
- Structure-Activity Relationship
- Transplantation, Heterologous
Research Beacons, Institutes and Platforms
- Manchester Cancer Research Centre