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Blockage of CRM1-dependent nuclear export of the adenovirus type 5 early region 1B 55-kDa protein augments oncogenic transformation of primary rat cells

Oncogene volume 24, pages 55–64 (2005)Cite this article

Abstract

The 55-kDa gene product from subgroup C adenovirus type 5 (Ad5) early region 1 (E1B-55kDa) plays a central role in the oncogenic transformation of primary rodent cells primarily by inactivating transcriptional and presumably other functional properties of the tumor suppressor protein p53. We have previously shown that Ad5 E1B-55kDa possesses a leucine-rich nuclear export signal (NES), which confers rapid nucleocytoplasmic shuttling via the CRM1-dependent export pathway. In this study we report that an export-deficient mutant of the viral protein (E1B-NES) substantially enhances focus formation of primary baby rat kidney cells in combination with Ad E1A. Transformed rat cells stably expressing the E1B-NES protein exhibited increased tumorigenicity and accelerated tumor growth in nude mice compared to transformants containing the wild-type E1B product. This ‘gain of function’ correlated with enhanced inhibition of p53 transactivation in transient reporter assays and the accumulation of the mutant protein and p53 in several dot-like subnuclear aggregates. Interestingly, these structures also contained a large fraction of cellular promyelocytic leukemia protein (PML), a known regulator of p53. These data indicate that E1B-NES promotes oncogenic transformation by combinatorial mechanisms that involve modulation of p53 in the context of PML nuclear bodies. In sum, these results extend our previous observation that inhibition of PML activities by E1B-55kDa is required for efficient focus formation and provide further support for the view that blocking p53 transcriptional functions is the principal mechanism by which the Ad protein contributes to complete cell transformation in conjunction with Ad E1A.

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Acknowledgements

We thank Drs B Wolf for LMB, A Levine for MAb 2A6, L de Jong for MAb 5E10, A Zantema for MAb 9C10, R Stauber for plasmid pF143Rexp21, and D Büchner and S Allmeier for able technical assistance. This work was supported by the Deutsche Forschungsgemeinschaft (Do 343/4-4) and by the Fonds der Chemischen Industrie (FCI).

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Author notes

  1. Christian Endter and Barbara Härtl: These authors contributed equally to this work

Authors and Affiliations

  1. Institut für Medizinische Mikrobiologie und Hygiene, Universität Regensburg, Landshuterstrasse 22, D-93047, Regensburg, Germany

    Christian Endter, Barbara Härtl, Thilo Spruss & Thomas Dobner

  2. Heinrich-Pette-Institut für Experimentelle Virologie und Immunologie, Martinistrasse 52, D-20251, Hamburg, Germany

    Joachim Hauber

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  1. Christian Endter
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  5. Thomas Dobner
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Correspondence to Thomas Dobner.

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Endter, C., Härtl, B., Spruss, T. et al. Blockage of CRM1-dependent nuclear export of the adenovirus type 5 early region 1B 55-kDa protein augments oncogenic transformation of primary rat cells. Oncogene 24, 55–64 (2005). https://doi.org/10.1038/sj.onc.1208170

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