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Experimental Therapeutics, Preclinical Pharmacology |
Division of Hematology and Oncology, Cedars-Sinai Medical Center, Los Angeles, California 90048 [M. H. M., H. H. Y., K. P., S. M., J. M. F., C. A., M. J. B., M. F., E. R., J. N., A. M., N. S-S., R. A. V., J. R. B.]; University of California Los Angeles School of Medicine and Jonsson Comprehensive Cancer Center, Los Angeles, California [M. H. M., H. H. Y., K. P., S. M., J. M. F., C. A., M. J. B., M. F., E. R., J. N., A. M., N. S-S., R. A. V., J. R. B.]; Division of Microbiology, University of California San Diego School of Medicine, San Diego, California [Z-q. W.]; and Millennium Pharmaceuticals, Inc., Cambridge, Massachusetts [J. A.]
Increased nuclear factor
B (NF-
B) activity is associated with increased tumor cell survival in multiple myeloma. The function of NF-
B is inhibited through binding to its inhibitor, I
B. Release of activated NF-
B follows proteasome-mediated degradation of I
B resulting from phosphorylation of the inhibitor and, finally, conjugation with ubiquitin. We report that myeloma cells have enhanced I
B
phosphorylation and increased NF-
B activity compared with normal hematopoietic cells. The proteasome inhibitor PS-341 blocked nuclear translocation of NF-
B, blocked NF-
B DNA binding, and demonstrated consistent antitumor activity against chemoresistant and chemosensitive myeloma cells. The sensitivity of chemoresistant myeloma cells to chemotherapeutic agents was markedly increased (100,0001,000,000-fold) when combined with a noncytotoxic dose of PS-341 without affecting normal hematopoietic cells. Similar effects were observed using a dominant negative super-repressor for I
B
. Thus, these results suggest that inhibition of NF-
B with PS-341 may overcome chemoresistance and allow doses of chemotherapeutic agents to be markedly reduced with antitumor effects without significant toxicity.
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A. Fribley, Q. Zeng, and C.-Y. Wang Proteasome Inhibitor PS-341 Induces Apoptosis through Induction of Endoplasmic Reticulum Stress-Reactive Oxygen Species in Head and Neck Squamous Cell Carcinoma Cells Mol. Cell. Biol., November 15, 2004; 24(22): 9695 - 9704. [Abstract] [Full Text] [PDF] |
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L. A. deGraffenried, B. Chandrasekar, W. E. Friedrichs, E. Donzis, J. Silva, M. Hidalgo, J. W. Freeman, and G. R. Weiss NF-{kappa}B inhibition markedly enhances sensitivity of resistant breast cancer tumor cells to tamoxifen Ann. Onc., June 1, 2004; 15(6): 885 - 890. [Abstract] [Full Text] [PDF] |
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X.-Y. Pei, Y. Dai, and S. Grant Synergistic Induction of Oxidative Injury and Apoptosis in Human Multiple Myeloma Cells by the Proteasome Inhibitor Bortezomib and Histone Deacetylase Inhibitors Clin. Cancer Res., June 1, 2004; 10(11): 3839 - 3852. [Abstract] [Full Text] [PDF] |
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B. Zheng, G. V. Georgakis, Y. Li, A. Bharti, D. McConkey, B. B. Aggarwal, and A. Younes Induction of Cell Cycle Arrest and Apoptosis by the Proteasome Inhibitor PS-341 in Hodgkin Disease Cell Lines Is Independent of Inhibitor of Nuclear Factor-{kappa}B Mutations or Activation of the CD30, CD40, and RANK Receptors Clin. Cancer Res., May 1, 2004; 10(9): 3207 - 3215. [Abstract] [Full Text] [PDF] |
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B. Barlogie, J. Shaughnessy, G. Tricot, J. Jacobson, M. Zangari, E. Anaissie, R. Walker, and J. Crowley Treatment of multiple myeloma Blood, January 1, 2004; 103(1): 20 - 32. [Abstract] [Full Text] [PDF] |
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P. M. Voorhees, E. C. Dees, B. O'Neil, and R. Z. Orlowski The Proteasome as a Target for Cancer Therapy Clin. Cancer Res., December 15, 2003; 9(17): 6316 - 6325. [Abstract] [Full Text] [PDF] |
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H. H. Yang, M. H. Ma, R. A. Vescio, and J. R. Berenson Overcoming Drug Resistance in Multiple Myeloma: The Emergence of Therapeutic Approaches to Induce Apoptosis J. Clin. Oncol., November 15, 2003; 21(22): 4239 - 4247. [Abstract] [Full Text] [PDF] |
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