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Blood, 1 April 2004, Vol. 103, No. 7, pp. 2761-2770. Prepublished online as a Blood First Edition Paper on November 26, 2003; DOI 10.1182/blood-2003-09-3037. This Article Full Text Full Text (PDF) All Versions of this Article: 2003-09-3037v1 103/7/2761    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 Dai, Y. Articles by Grant, S. Search for Related Content PubMed PubMed Citation Articles by Dai, Y. Articles by Grant, S. Related Collections Apoptosis Signal Transduction Neoplasia Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  NEOPLASIA Interruption of the NF-B pathway by Bay 11-7082 promotes UCN-01-mediated mitochondrial dysfunction and apoptosis in human multiple myeloma cells Yun Dai, Xin-Yan Pei, Mohamed Rahmani, Daniel H. Conrad, Paul Dent, and Steven Grant From the Departments of Medicine, Biochemistry, Pharmacology, Microbiology, and Radiation Oncology, Virginia Commonwealth University, Medical College of Virginia, Richmond. Interactions between pharmacologic NF-B inhibitors (eg, Bay 11-7082, SN-50) and the checkpoint abrogator UCN-01 have been examined in human multiple myeloma (MM) cells. Exposure of U266 cells to Bay 11-7082 (Bay) in combination with UCN-01 resulted in the abrogation of NF-B/DNA binding activity and the synergistic induction of apoptosis. Comparable synergism was observed in other MM cell lines and patient-derived CD138+ cells and between an inhibitory peptide of NF-B (SN50) and UCN-01. Bay/UCN-01-mediated lethality involved mitochondrial dysfunction, caspase cleavage, and poly adenosine diphosphate-ribose polymerase (PARP) degradation. Although Bay modestly blocked UCN-01-induced extracellular signal-regulated kinase (ERK) phosphorylation, coadministration activated c-Jun N-terminal kinase (JNK) and cdc2/cdk1 and down-regulated Mcl-1, XIAP, and Bcl-xL. Transfection with a constitutively activated mitogen-activated protein kinase kinase (MEK1)/green fluorescent protein (GFP) construct failed to block apoptosis induced by Bay/UCN-01 but significantly attenuated MEK inhibitor (U0126)/UCN-01-induced lethality. Inhibiting JNK activation with SP600125 or D-JNKI1 peptide markedly reduced Bay/UCN-01-mediated mitochondrial dysfunction and apoptosis and the down-regulation of Mcl-1, XIAP, and Bcl-xL but not of cdc2/cdk1 activation. Stable transfection of cells with dominant-negative caspase-9 dramatically diminished Bay/UCN-01 lethality without altering JNK or cdc2/cdk1 activation. Neither interleukin-6 (IL-6)- nor fibronectin-mediated adherence conferred resistance to Bay/UCN-01-induced apoptosis. Together, these findings suggest that a strategy combining UCN-01 with disruption of the IB kinase (IKK)/IB/NF-B pathway warrants attention in MM. (Blood. 2004;103:2761-2770) CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this? This article has been cited by other articles: S. A. Rushworth and D. J. MacEwan HO-1 underlies resistance of AML cells to TNF-induced apoptosis Blood, April 1, 2008; 111(7): 3793 - 3801. [Abstract] [Full Text] [PDF] S. Juliger, H. 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