4.5 Article

EphB1 Suppression in Acute Myelogenous Leukemia: Regulating the DNA Damage Control System

Journal

MOLECULAR CANCER RESEARCH
Volume 13, Issue 6, Pages 982-992

Publisher

AMER ASSOC CANCER RESEARCH
DOI: 10.1158/1541-7786.MCR-14-0660-T

Keywords

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Funding

  1. Foundation for Pediatric Oncology Groningen, the Netherlands (SKOG)
  2. Leukemia and Lymphoma society

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Loss of ephrin receptor (EphB1) expression may associate with aggressive cancer phenotypes; however, the mechanism of action remains unclear. To gain detailed insight into EphB1 function in acute myelogenous leukemia (AML), comprehensive analysis of EphB1 transcriptional regulation was conducted. In AML cells, EphB1 transcript was inversely correlated with EphB1 promoter methylation. The presence of EphB1 allowed EfnB1 ligand-mediated p53 DNA binding, leading to restoration of the DNA damage response (DDR) cascade by the activation of ATR, Chk1, p53, p21, p38, CDK1(tyr15), and Bax, and downregulation of HSP27 and Bcl2. Comparatively, reintroduction of EphB1 expression in EphB1-methylated AML cells enhanced the same cascade of ATR, Chk1, p21, and CDK1(tyr15), which consequently enforced programmed cell death. Interestingly, in pediatric AML samples, EphB1 peptide phosphorylation and mRNA expression were actively suppressed as compared with normal bone marrow, and a significant percentage of the primary AML specimens had EphB1 promoter hyper-methylation. Finally, EphB1 repression associated with a poor overall survival in pediatric AML. Combined, the contribution of EphB1 to the DDR system reveals a tumor-suppressor function for EphB1 in pediatric AML. (C) 2015 AACR.

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