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The adenovirus E4orf4 protein induces growth arrest and mitotic catastrophe in H1299 human lung carcinoma cells

Lookup NU author(s): Dr Olivier Binda

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Abstract

The human adenovirus E4orf4 protein, when expressed alone, induces p53-independent death in a wide range of cancer cells. Earlier studies by our groups suggested that although in some cases cell death can be associated with some hallmarks of apoptosis, it is not always affected by caspase inhibitors. Thus it is unlikely that E4orf4-induced cell death occurs uniquely through apoptosis. In the present studies using H1299 human lung carcinoma cells as a model system we found that death is induced in the absence of activation of any of the caspases tested, accumulation of reactive oxygen species, or release of cytochrome c from mitochondria. E4orf4 caused a substantial change in cell morphology, including vigorous membrane blebbing, multiple nuclei in many cells and increased cell volume. Most of these characteristics are not typical of apoptosis, but they are of necrosis. FACS analysis and western blotting for cell cycle markers showed that E4orf4-expressing cells became arrested in G(2)/M and also accumulated high levels of cyclin E. The presence of significant numbers of tetraploid and polyploid cells and some cells with micronuclei suggested that E4orf4 appears to induce death in these cells through a process resulting from mitotic catastrophe.

Publication metadata

Author(s): Li S, Szymborski A, Miron MJ, Marcellus R, Binda O, Lavoie JN, Branton PE

Publication type: Article

Publication status: Published

Journal: Oncogene

Year: 2009

Volume: 28

Issue: 3

Pages: 390-400

ISSN (print): 0950-9232

ISSN (electronic): 1476-5594

Publisher: Nature Publishing Group

URL: http://dx.doi.org/10.1038/onc.2008.393

DOI: 10.1038/onc.2008.393

PubMed id: 18955965

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