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Rapid dephosphorylation of p107 following UV irradiation

Oncogene volume 18, pages 679–688 (1999)Cite this article

Abstract

In response to UV irradiation, mouse NIH3T3 fibroblasts transiently arrest predominantly in the G1 phase of the cell cycle. Here, we investigate the role of the retinoblastoma-related pocket proteins in this biological process. We report here that UV induces an increase in p107/E2F complexes, shown previously to be repressors of E2F-dependent transcriptional activity. Several lines of evidence indicate that the increase of p107/E2F complexes following UV irradiation is a consequence of rapid dephosphorylation of p107. First, UV-mediated p107 dephosphorylation could be abolished by pretreatment of NIH3T3 fibroblasts with the serine/threonine phosphatase inhibitors calyculin A and okadaic acid. Second, alteration of protein phosphatase 2A holoenzyme composition by over-expression of specific B subunits interfered with UV-mediated dephosphorylation of p107. Consistent with this, p107 could be dephosphorylated in vitro with PP2A. Moreover, dephosphorylation of p107 was shown to be independent of the activity of p53 and p21, as it occurred also in UV-treated p53-null as well as p21-null mouse fibroblasts. We observed a close correlation between the UV dosages required for G1 cell cycle arrest and p107 dephosphorylation. Our data suggest a model in which UV radiation-induced cell cycle arrest depends, at least in part, on the induction of a PP2A-like phosphatase that acts on p107.

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Abbreviations

HA:

haemagglutinin

UV:

ultraviolet radiation

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Acknowledgements

We gratefully acknowledge the generosity of Prof Philip Leder, Prof Nick Dyson and Dr Antonio Giordano in providing the p21 null mouse embryo fibroblasts, the p107 and p130 antibodies, respectively. We thank Natasja Andjelkovic and Dr Brian Hemmings for the kind gift of various plasmids, anti-PP2A polyclonal sera. We also thank Prof Paul Farrell for critical comments on the manuscript.

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Authors and Affiliations

  1. Ludwig Institute for Cancer Research and Department of Medical Microbiology, Imperial College School of Medicine at St Mary's, Norfolk Place, London, W2 1PG, UK

    Roger J Watson, Peter G Farlie & Eric W-F Lam

  2. Division of Molecular Carcinogenesis, The Netherlands Cancer Institute, 121 Plesmanlaan, CX Amsterdam, 1066, The Netherlands

    P Mathijs Voorhoeve & René Bernards

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  1. P Mathijs Voorhoeve
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Voorhoeve, P., Watson, R., Farlie, P. et al. Rapid dephosphorylation of p107 following UV irradiation. Oncogene 18, 679–688 (1999). https://doi.org/10.1038/sj.onc.1202289

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