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Mechanisms of Retrovirus-induced Cancers

Retroviruses are RNA viruses that have been shown to cause cancers in diverse species, including chickens, mice, cats, and monkeys. The RNA genomes of these viruses are first reverse-transcribed into single and then double-stranded DNA (dsDNA) copies. This dsDNA called proviral DNA then integrates into the host genome. Subsequently, the host cell transcribes the proviral DNA in concert with the chromosomal DNA. This leads to the production of viral RNA and proteins that assemble at the host...
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A role for HPV16 E5 in cervical carcinogenesis.

John P Maufort1, Anny Shai, Henry C Pitot

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|March 25, 2010
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Summary

Human papillomavirus (HPV) oncogene E5 plays a role in cervical cancer development. E5 transgenic mice treated with estrogen developed more severe cervical disease, indicating its oncogenic potential.

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Area of Science:

  • Oncology
  • Virology
  • Molecular Biology

Background:

  • Human papillomaviruses (HPV), particularly HPV16, are linked to various cancers.
  • HPV16 encodes oncogenes E5, E6, and E7, with E5's role being less understood.
  • Cervical cancer development is influenced by HPV and hormonal factors like estrogen.

Purpose of the Study:

  • To investigate the oncogenic role of HPV16 E5 in cervical carcinogenesis.
  • To determine if E5 contributes to cervical cancer independently or in conjunction with E6/E7.
  • To assess the impact of estrogen on E5-driven cervical disease progression.

Main Methods:

  • Utilized E5 transgenic mice models.
  • Administered estrogen treatment to mice over a 6-month period.
  • Evaluated neoplastic cervical disease severity and cancer development.

Main Results:

  • E5 transgenic mice treated with estrogen showed more severe cervical neoplastic disease than controls.
  • Combined expression of E5 with E6 or E7 exacerbated neoplastic disease.
  • Prolonged estrogen exposure in E5 transgenic mice led to frank cervical cancer development.

Conclusions:

  • HPV16 E5 functions as an oncogene in the female mouse reproductive tract.
  • E5's oncogenic activity is enhanced by estrogen and in combination with other HPV oncogenes.
  • These findings highlight E5 as a potential therapeutic target in HPV-associated cancers.