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Cell and Tumor Biology |
Department of Discovery Medicine, Wyeth Research, Cambridge, Massachusetts
Requests for reprints: Diane R. Wonsey, Dana Farber Cancer Institute, 44 Binney Street, Mayer 649, Boston, MA 02115. Phone: 617-582-7944; E-mail: Diane_Wonsey{at}dfci.harvard.edu.
Expression of the forkhead transcription factor FoxM1 correlates with proliferative status in a variety of normal and transformed cell types. Elevated expression of FoxM1 has been noted in both hepatocellular carcinoma and basal cell carcinoma. However, whether FoxM1 expression is essential for the viability of transformed cells is unknown. We report here that the expression of FoxM1 is significantly elevated in primary breast cancer. Microarray analysis shows that FoxM1 regulates genes that are essential for faithful chromosome segregation and mitosis, including Nek2, KIF20A, and CENP-A. Loss of FoxM1 expression generates mitotic spindle defects, delays cells in mitosis, and induces mitotic catastrophe. Time-lapse microscopy indicates that depletion of FoxM1 generates cells that enter mitosis but are unable to complete cell division, resulting in either mitotic catastrophe or endoreduplication. These findings indicate that FoxM1 depletion causes cell death due to mitotic catastrophe and that inhibiting FoxM1 represents a therapeutic strategy to target breast cancer.
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