Abstract
The homeobox (Hox) gene family encodes a group of transcription factors preferentially expressed during embryonic development and hematopoiesis. Deregulation of Hox gene expression is frequently associated with acute leukemia. HoxA9 is the most commonly overexpressed Hox gene in acute leukemia. However, little is known regarding specific pathways regulated by HoxA9 that promote the growth and survival of leukemic cells. We have generated a conditional model of HoxA9 activity in the stromal cell dependent, HoxA9 negative, pre-B-cell line B-lineage-2 (BLIN-2). Conditional HoxA9 activation in BLIN-2 resulted in increased proliferation in the presence and absence of stromal cell support. Stimulation of HoxA9 activity resulted in increased expression of the c-Myb transcription factor and induction of insulin-like growth factor-1 receptor (IGF-1R) surface expression. HoxA9-mediated proliferative effects in BLIN-2 cells were abrogated when the cells were treated with specific IGF-1R tyrosine kinase inhibitors or with an IGF-1R mAb (A12). IGF-1R expression correlated with endogenous HoxA9 expression in a small panel of mixed lineage leukemia (MLL)/AF4 cell lines. siRNA knockdown of endogenous HoxA9 expression in the MLL/AF4-positive cell line RS4;11 resulted in loss of IGF-1R expression. These data indicate that HoxA9 overexpression induces IGF-1R expression and subsequently promotes leukemic cell growth.
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Acknowledgements
We thank Thomas Green for technical assistance. FEB was supported in part by grants from the Brody Brothers Medical Foundation of East Carolina University and the Leo W Jenkins Cancer Center seed grant program.
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Whelan, J., Ludwig, D. & Bertrand, F. HoxA9 induces insulin-like growth factor-1 receptor expression in B-lineage acute lymphoblastic leukemia. Leukemia 22, 1161–1169 (2008). https://doi.org/10.1038/leu.2008.57
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DOI: https://doi.org/10.1038/leu.2008.57
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