Regulation of Trib2 by an E2F1-C/EBP feedback loop in AML cell proliferation

Rishi, L. et al. (2014) Regulation of Trib2 by an E2F1-C/EBP feedback loop in AML cell proliferation. Blood, 123(15), pp. 2389-2400. (doi: 10.1182/blood-2013-07-511683) (PMID:24516045)

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The loss of regulation of cell proliferation is a key event in leukemic transformation, and the oncogene tribbles (Trib)2 is emerging as a pivotal target of transcription factors in acute leukemias. Deregulation of the transcription factor E2F1, normally repressed by CCAAT enhancer-binding protein α (C/EBPα)-p42, occurs in acute myeloid leukemia (AML), resulting in the perturbation of cell cycle and apoptosis, emphasizing its importance in the molecular pathogenesis of AML. Here we show that E2F family members directly regulate Trib2 in leukemic cells and identify a feedback regulatory loop for E2F1, C/EBPα, and Trib2 in AML cell proliferation and survival. Further analyses revealed that E2F1-mediated Trib2 expression was repressed by C/EBPα-p42, and in normal granulocyte/macrophage progenitor cells, we detect C/EBPα bound to the Trib2 promoter. Pharmacological inhibition of the cell cycle or Trib2 knockdown resulted in a block in AML cell proliferation. Our work proposes a novel paradigm whereby E2F1 plays a key role in the regulation of Trib2 expression important for AML cell proliferation control. Importantly, we identify the contribution of dysregulated C/EBPα and E2F1 to elevated Trib2 expression and leukemic cell survival, which likely contributes to the initiation and maintenance of AML and may have significant implications for normal and malignant hematopoiesis.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Keeshan, Dr Karen and Salome, Ms Mara and Campos, Ms Joana and O'Connor, Ms Caitriona
Authors: Rishi, L., Hannon, M., Salome, M., Hasemann, M., Frank, A.-K., Campos, J., Timoney, J., O'Connor, C., Cahill, M. R., Porse, B., and Keeshan, K.
College/School:College of Medical Veterinary and Life Sciences > School of Cancer Sciences
Journal Name:Blood
Publisher:American Society of Hematology
ISSN (Online):1528-0020

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
542691Development of a flow cytometry service within the Paul O'Gorman Leukaemia Research CentreAlison MichieThe Kay Kendall Leukaemia Fund (KENDALL)KKL501RI CANCER SCIENCES