Journal
BLOOD
Volume 105, Issue 3, Pages 1222-1230Publisher
AMER SOC HEMATOLOGY
DOI: 10.1182/blood-2004-03-0802
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Funding
- NCI NIH HHS [CA-81358] Funding Source: Medline
- NHLBI NIH HHS [T32-HL07780] Funding Source: Medline
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Coexpression of the homeodomain protein Meis1 and either HoxA7 or HoxA9 is characteristic of many acute myelogenous leukemias. Although Meis1 can be overexpressed in bone marrow long-term repopulating cells, it is incapable of mediating their transformation. Although over-expressing HoxA9 alone transforms murine bone marrow cells, concurrent Meis1 overexpression greatly accelerates oncogenesis. Meis1-HoxA9 cooperation suppresses several myeloid differentiation pathways. We now report that Meis1 overexpression strongly induces apoptosis in a variety of cell types in vitro through a caspase-dependent process. Meis1 requires a functional homeodomain and Pbx-interaction motif to induce apoptosis. Coexpressing HoxA9 with Meis1 suppresses this apoptosis and provides protection from several apoptosis inducers. Pbx1, another Meis1 cofactor, also induces apoptosis; however, coexpressing HoxA9 is incapable of rescuing Pbx-mediated apoptosis. This resistance to apoptotic stimuli, coupled with the previously reported ability to suppress multiple myelold differentiation pathways, would provide a strong selective advantage to Meisl-HoxA9 coexpressing cells in vivo, leading to leukernogenesis. (C) 2005 by The American Society of Hematology.
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