Abstract
We have studied the role of the HPV-16 E5 protein in apoptosis, using HaCaT cell lines stably transfected with either E5 (HaCaT/E5) or the empty vector (HaCaT/pMSG) as control. When subjected to a hyperosmolar concentration of sorbitol, HaCaT/E5 cells respond with cytochrome c release, activation of caspase-3, -8, and -9, and PARP-cleavage, showing that the mitochondria and death-receptor mediated apoptotic pathways are involved in subsequent cell death. Similar effects are observed for the control cells only after extended sorbitol treatment. Thus, E5-expressing cells are more sensitive to osmotic stress, perhaps because of modifications of the cellular membranes caused by this strongly hydrophobic molecule.
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Acknowledgements
We thank Ulrike Rothermel for excellent technical assistance and John Wray for critical reading of the manuscript. We are grateful to Pascal Tomakidi and Wolfgang Kabsch for valuable discussions.
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Kabsch, K., Alonso, A. The human papillomavirus type 16 (HPV-16) E5 protein sensitizes human keratinocytes to apoptosis induced by osmotic stress. Oncogene 21, 947–953 (2002). https://doi.org/10.1038/sj.onc.1205147
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DOI: https://doi.org/10.1038/sj.onc.1205147
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