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J. Virol., Oct 1996, 6862-6869, Vol 70, No. 10
Copyright © 1996, American Society for Microbiology

Abrogation of growth arrest signals by human papillomavirus type 16 E7 is mediated by sequences required for transformation

GW Demers, E Espling, JB Harry, BG Etscheid and DA Galloway
Program in Cancer Biology, Fred Hutchinson Cancer Research Center, Seattle, Washington 98040, USA.

Cells arrest in the G1 or G0 phase of the cell cycle in response to a variety of negative growth signals that induce arrest by different molecular pathways. The ability of human papillomavirus (HPV) oncogenes to bypass these signals and allow cells to progress into the S phase probably contributes to the neoplastic potential of the virus. The E7 protein of HPV-16 was able to disrupt the response of epithelial cells to three different negative growth arrest signals: quiescence imposed upon suprabasal epithelial cells, G1 arrest induced by DNA damage, and inhibition of DNA synthesis caused by treatment with transforming growth factor beta. The same set of mutated E7 proteins was able to abrogate all three growth arrest signals. Mutant proteins that failed to abrogate growth arrest signals were transformation deficient and included E7 proteins that bound retinoblastoma protein in vitro. In contrast, HPV-16 E6 was able to bypass only DNA damage-induced G1 arrest, not suprabasal quiescence or transforming growth factor beta- induced arrest. The E6 and E7 proteins from the low-risk virus HPV-6 were not able to bypass any of the growth arrest signals.


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