Abstract
Cell-cycle inhibitors of the Cip/Kip and INK4 families are involved in cellular senescence and tumor suppression. Some of these proteins, p21Cip1, p16INK4a and p15INK4b, are coexpressed in response to antiproliferative signals such as cellular senescence resulting in cell-cycle arrest. To understand the roles of these inhibitors and their synergistic effect, we have characterized the growth properties and senescent behavior of primary cells deficient in p21Cip1 and expressing an endogenous Cdk4R24C (cyclin-dependent kinase) mutant (Cdk4R24C knock-in cells) insensitive to INK4 proteins. Inactivation of both p21Cip1 and INK4 pathways strongly cooperate in suppressing cellular senescence in vitro. These double mutant cells behavior as immortal cultures and display high sensitivity to cellular transformation by oncogenes. Moreover, mice double mutant in the INK4 and p21Cip1 pathways (Cdk4R24C; p21Cip1-null mice) display an increased incidence of specific sarcomas, suggesting a significant cooperation between these two families of cell-cycle inhibitors in senescence responses and tumor suppression in vivo.
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Acknowledgements
We thank Mariano Barbacid for helpful discussions, and Sheila Rueda and Blanca Velasco for their valuable help in the management of the mouse colony. This work was supported by grants from the INSERM, and Association pour la Recherche contre le Cancer and the Région Aquitaine (to PD); Ministerio de Sanidad (FIS-02/0126), Fundación Mutua Madrileña and the Ministerio de Educación y Ciencia (SAF2005-00944) (to AC); and from the Ministerio de Educación y Ciencia (SAF2006-05186), Fundación Científica de la Asociación Española contra el Cáncer, Fundación Ramón Areces and Fundación Médica Mutua Madrileña Automovilística (to MM). The Cell Division and Cancer Group of the CNIO is supported by the OncoCycle program from the Comunidad de Madrid (S-BIO-0283-2006).
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Quereda, V., Martinalbo, J., Dubus, P. et al. Genetic cooperation between p21Cip1 and INK4 inhibitors in cellular senescence and tumor suppression. Oncogene 26, 7665–7674 (2007). https://doi.org/10.1038/sj.onc.1210578
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DOI: https://doi.org/10.1038/sj.onc.1210578
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