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• W2007672298 endingPage "2995" @default.
• W2007672298 startingPage "2988" @default.
• W2007672298 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, diminishing expression of inhibitors and increasing expression of inducers of angiogenesis. This altered phenotype may permit keratinocytes infected by HPV 16 to play a role in the progression of cancer by permitting tumors to acquire a blood supply permissive of growth and spread." @default.
• W2007672298 created "2016-06-24" @default.
• W2007672298 creator A5003360187 @default.
• W2007672298 creator A5050194633 @default.
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• W2007672298 date "2004-02-16" @default.
• W2007672298 modified "2023-09-26" @default.
• W2007672298 title "Expression of human papillomavirus type 16 E6 and E7 oncoproteins in primary foreskin keratinocytes is sufficient to alter the expression of angiogenic factors" @default.
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• W2007672298 doi "https://doi.org/10.1038/sj.onc.1207442" @default.
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