The human papillomavirus type 16 (HPV-16) E5 protein sensitizes human keratinocytes to apoptosis induced by osmotic stress
- 31 January 2002
- journal article
- research article
- Published by Springer Nature in Oncogene
- Vol. 21 (6) , 947-953
- https://doi.org/10.1038/sj.onc.1205147
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.Keywords
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