NPM-ALK Is a Key Regulator of the Oncoprotein FOXM1 in ALK-Positive Anaplastic Large Cell Lymphoma.
Barger, Carter J
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Haque, M., Li, J., Huang, Y., Almowaled, M., Barger, C. J., Karpf, A. R., Wang, P., et al. (2019). NPM-ALK Is a Key Regulator of the Oncoprotein FOXM1 in ALK-Positive Anaplastic Large Cell Lymphoma.. Cancers, 11 (8)https://doi.org/10.3390/cancers11081119
Forkhead Box M1 (FOXM1) is an oncogenic transcription factor implicated in the pathogenesis of solid and hematologic cancers. Here, we examined the significance of FOXM1 in NPM-ALK-positive anaplastic large cell lymphoma (NPM-ALK+ ALCL), with a focus on how it interacts with NPM-ALK, a key oncogenic driver in these tumors. FOXM1 was expressed in NPM-ALK+ ALCL cell lines (5/5), patient samples (6/6) and tumors arising in NPM-ALK transgenic mice (4/4). FOXM1 was localized in the nuclei, and confirmed to be transcriptionally active. Inhibition of FOXM1 in two NPM-ALK+ ALCL cells using shRNA and pharmalogic agent (thiostrepton) resulted in reductions in cell growth and soft-agar colony formation, which were associated with apoptosis and cell-cycle arrest. FOXM1 is functionally linked to NPM-ALK, as FOXM1 enhanced phosphorylation of the NPM-ALK/STAT3 axis. Conversely, DNA binding and transcriptional activity of FOXM1 was dependent on the expression of NPM-ALK. Further studies showed that this dependency hinges on the binding of FOXM1 to NPM1 that heterodimerizes with NPM-ALK, and the phosphorylation status of NPM-ALK. In conclusion, we identified FOXM1 as an important oncogenic protein in NPM-ALK+ ALCL. Our results exemplified that NPM-ALK exerts oncogenic effects in the nuclei, and illustrated a novel role of NPM1 in NPM-ALK pathobiology.
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External DOI: https://doi.org/10.3390/cancers11081119
This record's URL: https://www.repository.cam.ac.uk/handle/1810/295799
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