Abstract
Deregulation of cyclin E, an activator of cyclin-dependent kinase 2 (Cdk2), has been associated with a broad spectrum of human malignancies. Yet the mechanism linking abnormal cyclin E expression to carcinogenesis is largely unknown. The gene encoding the F-box protein hCdc4, a key component of the molecular machinery that targets cyclin E for degradation, is frequently mutated in endometrial cancer, leading to deregulation of cyclin E expression. Here we show that hCDC4 gene mutation and hyperphosphorylation of cyclin E, a parameter that usually correlates with hCDC4 mutation, have a strong statistically significant association with polypoidy and aneuploidy in endometrial cancer. On the contrary, elevated expression of cyclin E by itself was not significantly correlated with polyploidy or aneuploidy when tumors of similar grade are evaluated. These data suggest that impairment of cell cycle regulated proteolysis of cyclin E may be linked to carcinogenesis by promoting genomic instability.
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Acknowledgements
This work was supported by a Grant from ‘Fonds zur Förderung der wissenschaftlichen Forschung’ P15995-B05, P16159-B05 and from ‘Jubiläumsfonds der Österreichischen Nationalbank’, Project # 9856, and by NIH Grant CA78343 to SIR.
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Hubalek, M., Widschwendter, A., Erdel, M. et al. Cyclin E dysregulation and chromosomal instability in endometrial cancer. Oncogene 23, 4187–4192 (2004). https://doi.org/10.1038/sj.onc.1207560
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DOI: https://doi.org/10.1038/sj.onc.1207560
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