4,5-diarylisoxazole Hsp90 chaperone inhibitors: potential therapeutic agents for the treatment of cancer

Paul A Brough, Wynne Aherne, Xavier Barril, Jenifer Borgognoni, Kathy Boxall, Julie E Cansfield, Kwai-Ming J Cheung, Ian Collins, Nicholas G M Davies, Martin J Drysdale, Brian Dymock, Suzanne A Eccles, Harry Finch, Alexandra Fink, Angela Hayes, Robert Howes, Roderick E Hubbard, Karen James, Allan M Jordan, Andrea LockieVanessa Martins, Andrew Massey, Thomas P Matthews, Edward McDonald, Christopher J Northfield, Laurence H Pearl, Chrisostomos Prodromou, Stuart Ray, Florence I Raynaud, Stephen D Roughley, Swee Y Sharp, Allan Surgenor, D Lee Walmsley, Paul Webb, Mike Wood, Paul Workman, Lisa Wright

Research output: Contribution to journalArticlepeer-review

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 languageEnglish
Pages (from-to)196-218
Number of pages23
JournalJ Med Chem
Volume51
Issue number2
DOIs
Publication statusPublished - 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

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