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Cell Death Dis 2016[Jan]; 7 (1): e2046- PMID26764572show ga
This study demonstrates, for the first time, that loss of a single forkhead box class O (FoxO) transcription factor, can promote lymphomagenesis. Using two different mouse models, we show that FoxO3 has a significant tumour-suppressor function in the context of Myc-driven lymphomagenesis. Loss of FoxO3 significantly accelerated myeloid tumorigenesis in vavP-MYC10 transgenic mice and B lymphomagenesis in E?-myc transgenic mice. Tumour analysis indicated that the selective pressure for mutation of the p53 pathway during E?-myc lymphomagenesis was not altered. Frank tumours were preceded by elevated macrophage numbers in FoxO3?/? vavP-MYC10 mice but, surprisingly, pre-B-cell numbers were relatively normal in healthy young FoxO3?/?E?-myc mice. In vitro assays revealed enhanced survival capacity of Myc-driven cells lacking FoxO3, but no change in cell cycling was detected. The loss of FoxO3 may also be affecting other tumour-suppressive functions for which FoxO1/4 cannot fully compensate.