A novel orally active proteasome inhibitor induces apoptosis in multiple myeloma cells with mechanisms distinct from Bortezomib

  • Dharminder Chauhan
  • , Laurence Catley
  • , Guilan Li
  • , Klaus Podar
  • , Teru Hideshima
  • , Mugdha Velankar
  • , Constantine Mitsiades
  • , Nicolas Mitsiades
  • , Hiroshi Yasui
  • , Anthony Letai
  • , Huib Ovaa
  • , Celia Berkers
  • , Benjamin Nicholson
  • , Ta-Hsiang Chao
  • , Saskia T C Neuteboom
  • , Paul Richardson
  • , Michael A Palladino
  • , Kenneth C Anderson

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Bortezomib therapy has proven successful for the treatment of relapsed and/or refractory multiple myeloma (MM); however, prolonged treatment is associated with toxicity and development of drug resistance. Here, we show that the novel proteasome inhibitor NPI-0052 induces apoptosis in MM cells resistant to conventional and Bortezomib therapies. NPI-0052 is distinct from Bortezomib in its chemical structure, effects on proteasome activities, mechanisms of action, and toxicity profile against normal cells. Moreover, NPI-0052 is orally bioactive. In animal tumor model studies, NPI-0052 is well tolerated and prolongs survival, with significantly reduced tumor recurrence. Combining NPI-0052 and Bortezomib induces synergistic anti-MM activity. Our study therefore provides the rationale for clinical protocols evaluating NPI-0052, alone and together with Bortezomib, to improve patient outcome in MM.

Original languageEnglish
Pages (from-to)407-19
Number of pages13
JournalCancer Cell
Volume8
Issue number5
DOIs
Publication statusPublished - Nov 2005
Externally publishedYes

Keywords

  • Administration, Oral
  • Animals
  • Antineoplastic Agents
  • Apoptosis
  • Boronic Acids
  • Bortezomib
  • Caspases
  • Cell Movement
  • Cell Proliferation
  • Drug Synergism
  • Genes, bcl-2
  • Humans
  • Lactones
  • Lymphocytes
  • Mice
  • Mitochondria
  • Multiple Myeloma
  • NF-kappa B
  • Plasmacytoma
  • Protease Inhibitors
  • Proteasome Endopeptidase Complex
  • Pyrazines
  • Pyrroles
  • Tumor Cells, Cultured

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