HoxA9 regulated Bcl-2 expression mediates survival of myeloid progenitors and the severity of HoxA9-dependent leukemia

Gabriela Brumatti, Marika Salmanidis, Chung H. Kok, Rebecca A. Bilardi, Jarrod J. Sandow, Natasha Silke, Kylie Mason, Jolanda Visser, Anissa M. Jabbour, Stefan P. Glaser, Toru Okamoto, Philippe Bouillet, Richard J. D'Andrea, Paul G. Ekert

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Deregulated expression of Hox genes such as HoxA9 is associated with development of myeloproliferative disorders and leukemia and indicates a poor prognosis. To investigate the molecular mechanisms by which HoxA9 promotes immortalization of hematopoietic cells, we generated growth factor dependent myeloid cells in which HoxA9 expression is regulated by administration of 4-hydroxy-tamoxifen. Maintenance of HoxA9 overexpression is required for continued cell survival and proliferation, even in the presence of growth factors. We show for the first time that maintenance of Bcl-2 expression is critical for HoxA9-dependent immortalization and influences the latency of HoxA9-dependent leukemia. Hematopoietic cells lacking Bcl-2 were not immortalized by HoxA9 in vitro. Furthermore, deletion of Bcl-2 delayed the onset and reduced the severity of HoxA9/Meis1 and MLL-AF9 leukemias. This is the first description of a molecular link between HoxA9 and the regulation of Bcl-2 family members in acute myeloid leukemia.

Original languageEnglish
Pages (from-to)1933-1947
Number of pages15
JournalOncotarget
Volume4
Issue number11
DOIs
Publication statusPublished - Nov 2013

Keywords

  • Apoptosis
  • Bcl-2
  • HoxA9
  • Leukemia

ASJC Scopus subject areas

  • Oncology

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