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Blood, 1 March 2006, Vol. 107, No. 5, pp. 2094-2097. Prepublished online as a Blood First Edition Paper on November 22, 2005; DOI 10.1182/blood-2005-08-3317. This Article Full Text Full Text (PDF) Supplemental Table All Versions of this Article: 2005-08-3317v1 107/5/2094    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 Cai, D. Articles by Burchert, A. Search for Related Content PubMed PubMed Citation Articles by Cai, D. Articles by Burchert, A. Related Collections Neoplasia Oncogenes and Tumor Suppressors Signal Transduction Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  NEOPLASIA Brief report FLT3-ITD–, but not BCR/ABL-transformed cells require concurrent Akt/mTor blockage to undergo apoptosis after histone deacetylase inhibitor treatment Dali Cai, Ying Wang, Oliver G. Ottmann, Peter J. Barth, Andreas Neubauer, and Andreas Burchert From the Universitätsklinikum Marburg und Gießen, Standort Marburg, Klinik für Hämatologie, Onkologie, und Immunologie, and Institut für Pathologie, Marburg; and University Hospital Frankfurt, Medizinische Klinik III, Frankfurt, Germany. Leukemias are differentially sensitive to histone deacytelase inhibitor (HDI)–induced apoptosis, but molecular reasons for this remain unclear. We here show that BCR/ABL-, but not FMS-like tyrosine kinase 3 (FLT3)–internal tandem duplication (ITD)–transformed 32D cells or primary acute myeloid leukemia (AML) blasts undergo apoptosis after treatment with the HDI valproic acid (VPA) plus all-trans retinoic acid (VPA/ATRA). A particular VPA/ATRA responsiveness of Philadelphia chromosome–positive (Ph+) acute lymphatic leukemia (ALL) was confirmed in a therapy-refractory patient in vivo. HDI-stimulated apoptosis in Ph+ cells was caspase dependent, but independent from Akt pathway inhibition. Conversely, separate blockage of the Akt/mTor-signaling pathway was a prerequisite for overcoming apoptosis resistance to VPA/ATRA in FLT3-ITD cells, and primary AML blasts (n = 9). In conclusion, constitutive Akt activation causes apoptosis resistance to VPA/ATRA in AML, but not in Ph+ leukemia. This warrants the application of HDI-based therapies in poor-risk Ph+ ALL, and the use of Akt/mTor inhibitors to overcome HDI resistance in AML. CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this? This article has been cited by other articles: Y. Wang, D. Cai, C. Brendel, C. Barett, P. Erben, P. W. Manley, A. Hochhaus, A. Neubauer, and A. Burchert Adaptive secretion of granulocyte-macrophage colony-stimulating factor (GM-CSF) mediates imatinib and nilotinib resistance in BCR/ABL+ progenitors via JAK-2/STAT-5 pathway activation Blood, March 1, 2007; 109(5): 2147 - 2155. [Abstract] [Full Text] [PDF] S. Knapper, K. I. Mills, A. F. Gilkes, S. J. Austin, V. Walsh, and A. K. Burnett The effects of lestaurtinib (CEP701) and PKC412 on primary AML blasts: the induction of cytotoxicity varies with dependence on FLT3 signaling in both FLT3-mutated and wild-type cases Blood, November 15, 2006; 108(10): 3494 - 3503. [Abstract] [Full Text] [PDF]

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