Abstract
We have recently identified an internal tandem duplication of the human Flt3 gene in approximately 20% of acute myeloid leukemia (AML) cases. In the present study, the wild-type and the mutant Flt3 genes were transfected into two IL-3-dependent cell lines, 32D and BA/F3 cells. Mutant Flt3-transfected cells exhibited autonomous growth while wild-type Flt3-transfected cells with the continuous stimulation of Flt3 ligand exhibited a minimal proliferation. Cells expressing mutant Flt3 showed constitutive activation of STAT5 and MAP kinase. In contrast, Flt3 ligand stimulation caused rapid activation of MAP kinase but not STAT5 in cells expressing wild-type Flt3. Finally, we found constitutive activation of MAP kinase and STAT5 in all clinical samples of AML patients with mutant Flt3. Our study shows the significance of internal tandem duplication of Flt3 receptors for leukemia cell expansion.
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Acknowledgements
The authors thank Dr O Rosnet for providing the Flt3 cDNA clone, and S Suzuki and C Wakamatsu for their technical assistance. Murine IL-3 was provided by Kirin Brewery Co. This work was supported by grants-in-aid from the Public Trust Haraguchi Memorial Cancer Research Fund, Kanae Foundation for Life and Socio-Medical Science, Uehara Memorial Foundation and Osaka Cancer Research Foundation.
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Hayakawa, F., Towatari, M., Kiyoi, H. et al. Tandem-duplicated Flt3 constitutively activates STAT5 and MAP kinase and introduces autonomous cell growth in IL-3-dependent cell lines. Oncogene 19, 624–631 (2000). https://doi.org/10.1038/sj.onc.1203354
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DOI: https://doi.org/10.1038/sj.onc.1203354
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