Abstract
Previous studies have shown early region 1A (E1A) gene to inhibit the proliferation of tumour cells with wild-type, but not mutant, p53. E1A has also been shown to downregulate c-erb-B-2/neu expression, resulting in inhibition of growth in c-erb-B-2/neu overexpressing tumour cells. In this study, we have investigated the effect of E1A expression on four head and neck squamous cell carcinoma (HNSCC) cell lines that do not overexpress c-erb-B-2/neu. Cell cycle and Western blot analysis show E1A-mediated induction of apoptosis in all cell lines examined. This induction of apoptosis was independent of the p53 status as it occurred in the cell lines with wild-type, mutated or deleted p53. However, there was no evidence of E1A-induced apoptosis in a p53+ve normal human fibroblast cell line, 1BR3. Analysis of apoptosis in the SCC cell lines demonstrated E1A-mediated downregulation of EGFR, which was overexpressed in each of these cell lines. Overexpression of an exogenously introduced EGFR, under the control of an E1A-insensitive heterologous promoter, blocked E1A induction of apoptosis in these cells. Therefore, E1A-mediated downregulation of EGFR expression appears to be the cause, rather than a consequence of E1A-induced apoptosis in these SCC cell lines. Previous studies have shown downregulation of EGFR expression by PML. Interestingly, E1A expression in the HNSCC cells altered the pattern of PML distribution and induced the level of PML protein, thus suggesting that E1A-mediated downregulation of EGFR may occur via direct or indirect interactions with PML. These findings demonstrate a novel pathway by which E1A can induce apoptosis and identify EGFR as a potential target for the development of therapeutic strategies against epithelial malignancies, the majority of which have abnormal EGFR expression.
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Acknowledgements
We are grateful to Dr M-C Hung, Department of Molecular and Cellular Oncology, MD Anderson Cancer Center for the E1A vectors, to Prof. William Gullick Department of Biosciences, University of Kent at Canterbury for EGFR antibody and for advice on EGFR expression analysis, Dr Kun-San Chang, Department of Molecular Pathology, MD Anderson Cancer Center for PML antibody and advise on PML analysis. We would like to thank Dr Barry Gusterson, Department of Pathology, University of Glasgow for HN5, Dr Andrew Yeudall, Department of Craniofacial Development, Guy's Dental Institute for HN30 and Dr Stephen Prime, Department of Oral and Dental Science, University of Bristol for H357 cell lines. MF was supported by a studentship awarded by Guy's, King's and St Thomas's Dental Institute. This work was supported by grants from the Royal Society and European Union (EU).
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Flinterman, M., Gäken, J., Farzaneh, F. et al. E1A-mediated suppression of EGFR expression and induction of apoptosis in head and neck squamous carcinoma cell lines. Oncogene 22, 1965–1977 (2003). https://doi.org/10.1038/sj.onc.1206190
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DOI: https://doi.org/10.1038/sj.onc.1206190
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