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. 1992 Oct;66(10):6237–6241. doi: 10.1128/jvi.66.10.6237-6241.1992

Human papillomavirus type 16 E6 increases the degradation rate of p53 in human keratinocytes.

N L Hubbert 1, S A Sedman 1, J T Schiller 1
PMCID: PMC283680  PMID: 1326671

Abstract

The E6 proteins of the high-risk human papillomaviruses (HPVs) have been shown to form a complex with and induce the degradation of human p53 in vitro. To determine whether p53 is degraded more rapidly in cells expressing E6 in vivo, the half-life of p53 was determined by pulse-chase analysis in early-passage normal human keratinocytes and fibroblasts, human keratinocytes immortalized with HPV type 16 (HPV16) E6 plus E7, and nonimmortal keratinocytes transfected with E6. The results of these experiments indicate that (i) the half-life of newly synthesized p53 is relatively long (4 h) in early-passage human keratinocytes and fibroblasts but short in keratinocytes expressing E6 (15 to 30 min), (ii) a similar increased rate of p53 degradation was measured in lines immortalized with HPV16 E6 plus E7 and senescent cells expressing E6, indicating that this increase is not simply the result of selection in the immortalized lines, and (iii) very low levels of expression of E6 result in a greatly decreased half-life of p53, suggesting that E6 acts in a catalytic manner.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. Androphy E. J., Hubbert N. L., Schiller J. T., Lowy D. R. Identification of the HPV-16 E6 protein from transformed mouse cells and human cervical carcinoma cell lines. EMBO J. 1987 Apr;6(4):989–992. doi: 10.1002/j.1460-2075.1987.tb04849.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
  2. Baker S. J., Markowitz S., Fearon E. R., Willson J. K., Vogelstein B. Suppression of human colorectal carcinoma cell growth by wild-type p53. Science. 1990 Aug 24;249(4971):912–915. doi: 10.1126/science.2144057. [DOI] [PubMed] [Google Scholar]
  3. Band V., De Caprio J. A., Delmolino L., Kulesa V., Sager R. Loss of p53 protein in human papillomavirus type 16 E6-immortalized human mammary epithelial cells. J Virol. 1991 Dec;65(12):6671–6676. doi: 10.1128/jvi.65.12.6671-6676.1991. [DOI] [PMC free article] [PubMed] [Google Scholar]
  4. Barbosa M. S., Vass W. C., Lowy D. R., Schiller J. T. In vitro biological activities of the E6 and E7 genes vary among human papillomaviruses of different oncogenic potential. J Virol. 1991 Jan;65(1):292–298. doi: 10.1128/jvi.65.1.292-298.1991. [DOI] [PMC free article] [PubMed] [Google Scholar]
  5. Bártek J., Bártková J., Vojtesek B., Stasková Z., Lukás J., Rejthar A., Kovarík J., Midgley C. A., Gannon J. V., Lane D. P. Aberrant expression of the p53 oncoprotein is a common feature of a wide spectrum of human malignancies. Oncogene. 1991 Sep;6(9):1699–1703. [PubMed] [Google Scholar]
  6. Crook T., Tidy J. A., Vousden K. H. Degradation of p53 can be targeted by HPV E6 sequences distinct from those required for p53 binding and trans-activation. Cell. 1991 Nov 1;67(3):547–556. doi: 10.1016/0092-8674(91)90529-8. [DOI] [PubMed] [Google Scholar]
  7. Crook T., Wrede D., Vousden K. H. p53 point mutation in HPV negative human cervical carcinoma cell lines. Oncogene. 1991 May;6(5):873–875. [PubMed] [Google Scholar]
  8. Eliyahu D., Michalovitz D., Eliyahu S., Pinhasi-Kimhi O., Oren M. Wild-type p53 can inhibit oncogene-mediated focus formation. Proc Natl Acad Sci U S A. 1989 Nov;86(22):8763–8767. doi: 10.1073/pnas.86.22.8763. [DOI] [PMC free article] [PubMed] [Google Scholar]
  9. Finlay C. A., Hinds P. W., Levine A. J. The p53 proto-oncogene can act as a suppressor of transformation. Cell. 1989 Jun 30;57(7):1083–1093. doi: 10.1016/0092-8674(89)90045-7. [DOI] [PubMed] [Google Scholar]
  10. Finlay C. A., Hinds P. W., Tan T. H., Eliyahu D., Oren M., Levine A. J. Activating mutations for transformation by p53 produce a gene product that forms an hsc70-p53 complex with an altered half-life. Mol Cell Biol. 1988 Feb;8(2):531–539. doi: 10.1128/mcb.8.2.531. [DOI] [PMC free article] [PubMed] [Google Scholar]
  11. Fuchs E. Epidermal differentiation: the bare essentials. J Cell Biol. 1990 Dec;111(6 Pt 2):2807–2814. doi: 10.1083/jcb.111.6.2807. [DOI] [PMC free article] [PubMed] [Google Scholar]
  12. Harris N., Brill E., Shohat O., Prokocimer M., Wolf D., Arai N., Rotter V. Molecular basis for heterogeneity of the human p53 protein. Mol Cell Biol. 1986 Dec;6(12):4650–4656. doi: 10.1128/mcb.6.12.4650. [DOI] [PMC free article] [PubMed] [Google Scholar]
  13. Hawley-Nelson P., Vousden K. H., Hubbert N. L., Lowy D. R., Schiller J. T. HPV16 E6 and E7 proteins cooperate to immortalize human foreskin keratinocytes. EMBO J. 1989 Dec 1;8(12):3905–3910. doi: 10.1002/j.1460-2075.1989.tb08570.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
  14. Hudson J. B., Bedell M. A., McCance D. J., Laiminis L. A. Immortalization and altered differentiation of human keratinocytes in vitro by the E6 and E7 open reading frames of human papillomavirus type 18. J Virol. 1990 Feb;64(2):519–526. doi: 10.1128/jvi.64.2.519-526.1990. [DOI] [PMC free article] [PubMed] [Google Scholar]
  15. Huibregtse J. M., Scheffner M., Howley P. M. A cellular protein mediates association of p53 with the E6 oncoprotein of human papillomavirus types 16 or 18. EMBO J. 1991 Dec;10(13):4129–4135. doi: 10.1002/j.1460-2075.1991.tb04990.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
  16. Inoue H., Kondoh G., Sudiro T. M., Hakura A. Stability of p53 protein in rat cells transformed by various viral transforming genes. Virology. 1992 Mar;187(1):343–347. doi: 10.1016/0042-6822(92)90325-j. [DOI] [PubMed] [Google Scholar]
  17. Masuda H., Miller C., Koeffler H. P., Battifora H., Cline M. J. Rearrangement of the p53 gene in human osteogenic sarcomas. Proc Natl Acad Sci U S A. 1987 Nov;84(21):7716–7719. doi: 10.1073/pnas.84.21.7716. [DOI] [PMC free article] [PubMed] [Google Scholar]
  18. Mincheva A., Gissmann L., zur Hausen H. Chromosomal integration sites of human papillomavirus DNA in three cervical cancer cell lines mapped by in situ hybridization. Med Microbiol Immunol. 1987;176(5):245–256. doi: 10.1007/BF00190531. [DOI] [PubMed] [Google Scholar]
  19. Münger K., Phelps W. C., Bubb V., Howley P. M., Schlegel R. The E6 and E7 genes of the human papillomavirus type 16 together are necessary and sufficient for transformation of primary human keratinocytes. J Virol. 1989 Oct;63(10):4417–4421. doi: 10.1128/jvi.63.10.4417-4421.1989. [DOI] [PMC free article] [PubMed] [Google Scholar]
  20. Nigro J. M., Baker S. J., Preisinger A. C., Jessup J. M., Hostetter R., Cleary K., Bigner S. H., Davidson N., Baylin S., Devilee P. Mutations in the p53 gene occur in diverse human tumour types. Nature. 1989 Dec 7;342(6250):705–708. doi: 10.1038/342705a0. [DOI] [PubMed] [Google Scholar]
  21. Oren M., Maltzman W., Levine A. J. Post-translational regulation of the 54K cellular tumor antigen in normal and transformed cells. Mol Cell Biol. 1981 Feb;1(2):101–110. doi: 10.1128/mcb.1.2.101. [DOI] [PMC free article] [PubMed] [Google Scholar]
  22. Scheffner M., Münger K., Byrne J. C., Howley P. M. The state of the p53 and retinoblastoma genes in human cervical carcinoma cell lines. Proc Natl Acad Sci U S A. 1991 Jul 1;88(13):5523–5527. doi: 10.1073/pnas.88.13.5523. [DOI] [PMC free article] [PubMed] [Google Scholar]
  23. Scheffner M., Werness B. A., Huibregtse J. M., Levine A. J., Howley P. M. The E6 oncoprotein encoded by human papillomavirus types 16 and 18 promotes the degradation of p53. Cell. 1990 Dec 21;63(6):1129–1136. doi: 10.1016/0092-8674(90)90409-8. [DOI] [PubMed] [Google Scholar]
  24. Schneider-Gädicke A., Schwarz E. Different human cervical carcinoma cell lines show similar transcription patterns of human papillomavirus type 18 early genes. EMBO J. 1986 Sep;5(9):2285–2292. doi: 10.1002/j.1460-2075.1986.tb04496.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
  25. Sedman S. A., Barbosa M. S., Vass W. C., Hubbert N. L., Haas J. A., Lowy D. R., Schiller J. T. The full-length E6 protein of human papillomavirus type 16 has transforming and trans-activating activities and cooperates with E7 to immortalize keratinocytes in culture. J Virol. 1991 Sep;65(9):4860–4866. doi: 10.1128/jvi.65.9.4860-4866.1991. [DOI] [PMC free article] [PubMed] [Google Scholar]
  26. Sedman S. A., Hubbert N. L., Vass W. C., Lowy D. R., Schiller J. T. Mutant p53 can substitute for human papillomavirus type 16 E6 in immortalization of human keratinocytes but does not have E6-associated trans-activation or transforming activity. J Virol. 1992 Jul;66(7):4201–4208. doi: 10.1128/jvi.66.7.4201-4208.1992. [DOI] [PMC free article] [PubMed] [Google Scholar]
  27. Smotkin D., Wettstein F. O. Transcription of human papillomavirus type 16 early genes in a cervical cancer and a cancer-derived cell line and identification of the E7 protein. Proc Natl Acad Sci U S A. 1986 Jul;83(13):4680–4684. doi: 10.1073/pnas.83.13.4680. [DOI] [PMC free article] [PubMed] [Google Scholar]
  28. Werness B. A., Levine A. J., Howley P. M. Association of human papillomavirus types 16 and 18 E6 proteins with p53. Science. 1990 Apr 6;248(4951):76–79. doi: 10.1126/science.2157286. [DOI] [PubMed] [Google Scholar]
  29. Woodworth C. D., Bowden P. E., Doniger J., Pirisi L., Barnes W., Lancaster W. D., DiPaolo J. A. Characterization of normal human exocervical epithelial cells immortalized in vitro by papillomavirus types 16 and 18 DNA. Cancer Res. 1988 Aug 15;48(16):4620–4628. [PubMed] [Google Scholar]

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