SEARCH:   Advanced

Blood, 1 September 2004, Vol. 104, No. 5, pp. 1465-1473. Prepublished online as a Blood First Edition Paper on May 13, 2004; DOI 10.1182/blood-2003-11-4039. This Article Full Text Full Text (PDF) All Versions of this Article: 2003-11-4039v1 104/5/1465    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 Weston, V. J. Articles by Stankovic, T. Search for Related Content PubMed PubMed Citation Articles by Weston, V. J. Articles by Stankovic, T. Related Collections Neoplasia Apoptosis Signal Transduction Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  NEOPLASIA Apoptotic resistance to ionizing radiation in pediatric B-precursor acute lymphoblastic leukemia frequently involves increased NF-B survival pathway signaling Victoria J. Weston, Belinda Austen, Wenbin Wei, Eliot Marston, Azra Alvi, Sarah Lawson, Philip J. Darbyshire, Mike Griffiths, Frank Hill, Jill R. Mann, Paul A. H. Moss, A. Malcolm R. Taylor, and Tatjana Stankovic From the Cancer Research UK Institute for Cancer Studies, Birmingham University, Edgbaston, United Kingdom; Department of Haematology, Birmingham Children's Hospital, Birmingham, United Kingdom; and West Midlands Regional Genetics Laboratory, Birmingham Women's Hospital, Edgbaston, United Kingdom. To investigate possible causes of the variable response to treatment in pediatric B-precursor acute lymphoblastic leukemia (ALL) and to establish potential novel therapeutic targets, we used ionizing radiation (IR) exposure as a model of DNA damage formation to identify tumors with resistance to p53-dependent apoptosis. Twenty-one of 40 ALL tumors responded normally to IR, exhibiting accumulation of p53 and p21 proteins and cleavage of caspases 3, 7, and 9 and of PARP1. Nineteen tumors exhibited apoptotic resistance and lacked PARP1 and caspase cleavage; although 15 of these tumors had normal accumulation of p53 and p21 proteins, examples exhibited abnormal expression of TRAF5, TRAF6, and cIAP1 after IR, suggesting increased NF-B prosurvival signaling as the mechanism of apoptotic resistance. The presence of a hyperactive PARP1 mutation in one tumor was consistent with such increased NF-B activity. PARP1 inhibition restored p53-dependent apoptosis after IR in these leukemias by reducing NF-B DNA binding and transcriptional activity. In the remaining 4 ALL tumors, apoptotic resistance was associated with a TP53 mutation or with defective activation of p53. We conclude that increased NF-B prosurvival signaling is a frequent mechanism by which B-precursor ALL tumors develop apoptotic resistance to IR and that PARP1 inhibition may improve the DNA damage response of these leukemias. CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this? This article has been cited by other articles: E. Marston, V. Weston, J. Jesson, E. Maina, C. McConville, A. Agathanggelou, A. Skowronska, K. Mapp, K. Sameith, J. E. Powell, et al. Stratification of pediatric ALL by in vitro cellular responses to DNA double-strand breaks provides insight into the molecular mechanisms underlying clinical response Blood, January 1, 2009; 113(1): 117 - 126. [Abstract] [Full Text] [PDF] D. S. Kim, J. A. Franklyn, A. L. Stratford, K. Boelaert, J. C. Watkinson, M. C. Eggo, and C. J. McCabe Pituitary Tumor-Transforming Gene Regulates Multiple Downstream Angiogenic Genes in Thyroid Cancer J. Clin. Endocrinol. Metab., March 1, 2006; 91(3): 1119 - 1128. [Abstract] [Full Text] [PDF] A. Holleman, M. L. den Boer, R. X. de Menezes, M. H. Cheok, C. Cheng, K. M. Kazemier, G. E. Janka-Schaub, U. Gobel, U. B. Graubner, W. E. Evans, et al. The expression of 70 apoptosis genes in relation to lineage, genetic subtype, cellular drug resistance, and outcome in childhood acute lymphoblastic leukemia Blood, January 15, 2006; 107(2): 769 - 776. [Abstract] [Full Text] [PDF] A. J. Alvi, B. Austen, V. J. Weston, C. Fegan, D. MacCallum, A. Gianella-Borradori, D. P. Lane, M. Hubank, J. E. Powell, W. Wei, et al. A novel CDK inhibitor, CYC202 (R-roscovitine), overcomes the defect in p53-dependent apoptosis in B-CLL by down-regulation of genes involved in transcription regulation and survival Blood, June 1, 2005; 105(11): 4484 - 4491. [Abstract] [Full Text] [PDF]

	Copyright © 2004 by American Society of Hematology         Online ISSN: 1528-0020