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Blood, 1 May 2007, Vol. 109, No. 9, pp. 3998-4005.
Prepublished online as a Blood First Edition Paper on January 16, 2007; DOI 10.1182/blood-2006-08-041202.
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Submitted August 11, 2006
Accepted November 17, 2006
Trib1 and Evi1 cooperate with Hoxa and Meis1 in myeloid leukemogenesis
Guang Jin, Yukari Yamazaki, Miki Takuwa, Tomoko Takahara, Keiko Kaneko, Takeshi Kuwata, Satoshi Miyata, and Takuro Nakamura*
Dept of Carcinogenesis, the Cancer Institute, Japanese Foundation for Cancer Research, Tokyo, Japan
Bioinformatics Group, Genome Center, Japanese Foundation for Cancer Research, Tokyo, Japan
* Corresponding author; email: takuro-ind{at}umin.ac.jp.
Cooperative activation of Meis1 and Hoxa9 perturbs myeloid differentiation and eventually leads myeloid progenitors to leukemia. Yet it remains to be clarified what kinds of subsequent molecular processes are required for development of overt leukemia. To understand the molecular pathway in Hoxa9/Meis1-induced leukemogenesis retroviral insertional mutagenesis was applied using retrovirus-mediated gene transfer. The mice received Hoxa9/Meis1-transduced bone marrow cells developed acute myeloid leukemia (AML), and Trib1, Evi1, Ahi1, Rar , Pitpnb and AK039950 were identified as candidate cooperative genes located near common retroviral integration sites. Trib1 and Evi1 were up-regulated due to retroviral insertions and co-expression of these genes significantly accelerated the onset of Hoxa9/Meis1-induced AML, suggesting that Trib1 and Evi1 are the key collaborators. Furthermore, Trib1 by itself is a novel myeloid oncogene, enhancing phosphorylation of ERK resulting in inhibition of apoptosis. These results demonstrate the importance of specific oncogene interaction in myeloid leukemogenesis.
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