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Expression of human papillomavirus type 16 E6 and E7 oncoproteins in primary foreskin keratinocytes is sufficient to alter the expression of angiogenic factors

Toussaint-Smith, Esra, Donner, David B, Roman, Ann·2004·Oncogene
DOI 10.1038/sj.onc.1207442
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Abstract

Human papillomavirus (HPV) 16 is involved in causing cervical cancer. The E6 and E7 proteins of HPV 16 immortalize human keratinocytes and this is due, at least in part, to inactivation of the tumor suppressor proteins p53 and pRB. These tumor suppressor proteins also regulate the expression of pro- and antiangiogenic factors by cells. For this reason, experiments were conducted to determine whether the expression of E6 and E7 in primary keratinocytes alters the phenotype of these cells such that they express diminished levels of antiangiogenic factors and/or increased levels of proangiogenic factors. To avoid variances in experimental observations, pools of human foreskin keratinocytes from multiple sources were infected with recombinant retrovirus expressing HPV 16 E6 and E7 or control retrovirus. Gene array analysis, RT-PCR, ELISAs and Western blotting showed that in cells expressing HPV 16 E6 and E7, expression levels of two potent angiogenesis inhibitors, thrombospondin-1 and maspin, were lower compared to controls. Additionally, major angiogenesis inducers, interleukin-8 and vascular endothelial growth factor (VEGF), were increased relative to controls. VEGF can be produced as multiple splice variants, all of which are required for the formation of patent blood vessels. The expression of HPV 16 E6 and E7 in keratinocytes augmented expression of VEGF 121, 145, 165 and 189. These observations show that HPV 16 E6 and E7 alter the phenotype of primary keratinocytes, diminis…

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Cited by

Metadata

Authors
Toussaint-Smith, E., Donner, D. B., & Roman, A.
Venue
Oncogene
Publisher
Springer Science and Business Media LLC
Published
2004-02-16
Volume
23
Issue
17
Pages
2988-2995
ISSN
  • 0950-9232
  • 1476-5594
DOI
10.1038/sj.onc.1207442
Cited by
119
References
2
Language
en
Licence

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