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Blood, 1 January 2006, Vol. 107, No. 1, pp. 257-264. Prepublished online as a Blood First Edition Paper on September 15, 2005; DOI 10.1182/blood-2005-05-2091. This Article Full Text Full Text (PDF) All Versions of this Article: 2005-05-2091v1 107/1/257    most recent Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Rights and Permissions Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Pérez-Galán, P. Articles by Colomer, D. Search for Related Content PubMed PubMed Citation Articles by Pérez-Galán, P. Articles by Colomer, D. Related Collections Neoplasia Apoptosis Oncogenes and Tumor Suppressors Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  NEOPLASIA The proteasome inhibitor bortezomib induces apoptosis in mantle-cell lymphoma through generation of ROS and Noxa activation independent of p53 status Patricia Pérez-Galán, Gaël Roué, Neus Villamor, Emili Montserrat, Elias Campo, and Dolors Colomer From the Hematopathology Unit, Departments of Pathology and Hematology, Hospital Clínic, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), University of Barcelona, Barcelona, Spain. Mantle-cell lymphoma (MCL) is a mature B-cell lymphoma with an aggressive course and generally poor prognosis. Conventional chemotherapy has little efficacy. Bortezomib is a novel, reversible, and highly specific proteasome inhibitor that appears as a new hope for MCL treatment. We have analyzed the in vitro sensitivity to bortezomib in 4 MCL cell lines and in primary tumor cells from 10 MCL patients. Bortezomib induced phosphatidylserine exposure, mitochondrial depolarization, ROS generation, Bax and Bak conformational changes, and caspase activation. In addition, ROS scavengers, but not pancaspase inhibitors, blocked all apoptosis hallmarks. Protein and mRNA-expression analysis, revealed marked up-regulation of the BH3-only protein Noxa, between 4 to 6 hours after bortezomib addition, independent of p53 status. However, this up-regulation was faster and higher in cells with functional p53. Noxa RNA interference markedly decreased sensitivity to bortezomib, pointing to this protein as a key mediator between proteasome inhibition and mitochondrial depolarization in MCL cells. Noxa interacts with the antiapoptotic protein Mcl-1 and promotes Bak release from Mcl-1, suggesting that up-regulation of Noxa might counteract Mcl-1 accumulation after bortezomib treatment. These findings should be useful to extend the therapeutic strategies in MCL patients and to improve their prognosis. CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this? This article has been cited by other articles: S. Chen, Y. Dai, X.-Y. Pei, and S. Grant Bim Upregulation by Histone Deacetylase Inhibitors Mediates Interactions with the Bcl-2 Antagonist ABT-737: Evidence for Distinct Roles for Bcl-2, Bcl-xL, and Mcl-1 Mol. Cell. Biol., December 1, 2009; 29(23): 6149 - 6169. [Abstract] [Full Text] [PDF] A. M. Evens, W. G. Spies, I. B. Helenowski, D. Patton, S. Spies, B. D. Jovanovic, S. Miyata, E. Hamilton, D. Variakojis, J. Chen, et al. 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