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Oncogenes and tumor angiogenesis: the HPV-16 E6 oncoprotein activates the vascular endothelial growth factor (VEGF) gene promoter in a p53 independent manner

López-Ocejo, Omar, Viloria-Petit, Alicia, Bequet-Romero, Mónica, Mukhopadhyay, Debabrata, Rak, Janusz, Kerbel, Robert S·2000·Oncogene
DOI 10.1038/sj.onc.1203817
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Abstract

Like other types of pre-malignant lesions and carcinoma, angiogenesis is associated with high-grade cervical dysplasia and with invasive squamous carcinoma of the cervix. Vascular endothelial cell growth factor (VEGF) is known to be one of the most important inducers of angiogenesis and is upregulated in carcinoma of the cervix. Human Papilloma Virus 16 (HPV-16) has been etiologically linked to human cervical cancer, and the major oncogenic proteins encoded by the viral genome, E6 and E7, are involved in the immortalization of target cells. Because several oncogenes including mutant ras, EGF receptor, ErbB2/Her2, c-myc and v-src upregulate VEGF expression, we asked whether HVP-16 E6 oncoprotein could act in a similar fashion. We found that HPV-16 E6-positive cells generally express high levels of VEGF message. Furthermore, co-expression of the VEGF promoter-Luc (luciferase) reporter gene with E6 in both human keratinocytes and mouse fibroblast showed that E6 oncoprotein upregulates VEGF promoter activity, and does so in a p53 independent manner. An E6 responsive region which comprises four Sp-1 sites, between -194 and -50 bp of the VEGF promoter, is also necessary for constitutive VEGF transcription. Taken together, our results suggest the possibility that the HPV oncoprotein E6 may contribute to tumor angiogenesis by direct stimulation of the VEGF gene.

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Metadata

Authors
López-Ocejo, O., Viloria-Petit, A., Bequet-Romero, M., Mukhopadhyay, D., Rak, J., & Kerbel, R. S.
Venue
Oncogene
Publisher
Springer Science and Business Media LLC
Published
2000-09-21
Volume
19
Issue
40
Pages
4611-4620
ISSN
  • 0950-9232
  • 1476-5594
DOI
10.1038/sj.onc.1203817
Cited by
183
References
4
Language
en
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CoChat. (2026). Citation check: Oncogenes and tumor angiogenesis: the HPV-16 E6 oncoprotein activates the vascular endothelial growth factor (VEGF) gene promoter in a p53 independent manner. https://app.cochat.ai/papers/10.1038/sj.onc.1203817
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López-Ocejo, O., Viloria-Petit, A., Bequet-Romero, M., Mukhopadhyay, D., Rak, J., & Kerbel, R. S. (2000). Oncogenes and tumor angiogenesis: the HPV-16 E6 oncoprotein activates the vascular endothelial growth factor (VEGF) gene promoter in a p53 independent manner. Oncogene. https://doi.org/10.1038/sj.onc.1203817