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 language | English |
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Pages (from-to) | 407-419 |
Number of pages | 13 |
Journal | Cancer Cell |
Volume | 8 |
Issue number | 5 |
DOIs | |
Publication status | Published - Nov 2005 |
Externally published | Yes |
Keywords
- Administration, Oral
- Animals
- Antineoplastic Agents/pharmacology
- Apoptosis/drug effects
- Boronic Acids/pharmacology
- Bortezomib
- Caspases/metabolism
- Cell Movement/drug effects
- Cell Proliferation/drug effects
- Drug Synergism
- Genes, bcl-2
- Humans
- Lactones/administration & dosage
- Lymphocytes/drug effects
- Mice
- Mitochondria/drug effects
- Multiple Myeloma/drug therapy
- NF-kappa B/metabolism
- Plasmacytoma/drug therapy
- Protease Inhibitors/pharmacology
- Proteasome Endopeptidase Complex/pharmacology
- Pyrazines/pharmacology
- Pyrroles/administration & dosage
- Tumor Cells, Cultured