NDLI: Overexpression of cyclin E/CDK2 complexes overcomes FGF-induced cell cycle arrest in the presence of hypophosphorylated Rb proteins

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Overexpression of cyclin E/CDK2 complexes overcomes FGF-induced cell cycle arrest in the presence of hypophosphorylated Rb proteins

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Overexpression of cyclin E/CDK2 complexes overcomes FGF-induced cell cycle arrest in the presence of hypophosphorylated Rb proteins

Content Provider	PubMed Central
Author	Victoria, Kolupaeva Claudio, Basilico
Copyright Year	2012
Abstract	FGF signaling inhibits chondrocyte proliferation and requires the function of the p107 and p130 members of the Rb protein family to execute growth arrest. p107 dephosphorylation plays a critical role in the chondrocyte response to FGF, as overexpression of cyclin D1/CDK4 complexes (the major p107 kinase) in rat chondrosarcoma (RCS) cells overcomes FGF-induced p107 dephosphorylation and growth arrest. In cells overexpressing cyclin D1/CDK4, FGF-induced downregulation of cyclin E/CDK2 activity was absent. To examine the role of cyclin E/CDK2 complexes in mediating FGF-induced growth arrest, this kinase was overexpressed in RCS cells. FGF-induced dephosphorylation of either p107 or p130 was not prevented by overexpressing cyclin E/CDK2 complexes. Unexpectedly, however, FGF-treated cells exhibited sustained proliferation even in the presence of hypophosphorylated p107 and p130. Both pocket proteins were able to form repressive complexes with E2F4 and E2F5 but these repressors were not translocated into the nucleus and therefore were unable to occupy their respective target DNA sites. Overexpressed cyclin E/CDK2 molecules were stably associated with p107 and p130 in FGF-treated cells in the context of E2F repressive complexes. Taken together, our data suggest a novel mechanism by which cyclin E/CDK2 complexes can promote cell cycle progression in the presence of dephosphorylated Rb proteins and provide a novel insight into the key Retinoblastoma/E2F/cyclin E pathway. Our data also highlight the importance of E2F4/p130 complexes for FGF-mediated growth arrest in chondrocytes.
Related Links	http://dx.doi.org/10.4161/cc.20944
Ending Page	2566
Page Count	10
Starting Page	2557
File Format	PDF
ISSN	15384101
e-ISSN	15514005
Journal	Cell Cycle
Issue Number	13
Volume Number	11
Language	English
Publisher	Landes Bioscience
Publisher Date	2012-07-01
Access Restriction	Open
Rights Holder	Landes Bioscience
Subject Keyword	Developmental Biology Cell Biology Molecular Biology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cell Biology Developmental Biology Medicine Molecular Biology

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