Depletion of the cdk inhibitor p16INK4a differentially affects proliferation of established cervical carcinoma cells.
J Virol
; 88(10): 5256-62, 2014 May.
Article
em En
| MEDLINE
| ID: mdl-24599991
ABSTRACT
UNLABELLED Infections with high-risk human papillomaviruses (hrHPV) contribute to cervical carcinoma. The cdk inhibitor and tumor suppressor p16INK4A is consistently upregulated in cervical carcinoma cells for reasons that are poorly understood. We report here that downregulation of p16INK4A gene expression in three different cervical carcinoma cell lines reduced expression of the E7 oncogene, suggesting a positive feedback loop involving E7 and p16INK4A. p16INK4A depletion induced cellular senescence in HeLa but not CaSki and MS-751 cervical carcinoma cells. IMPORTANCE This study demonstrates that the cdk inhibitor p16INK4A, frequently used as surrogate marker for transforming infections by human papillomaviruses of the high-risk group, is required for high-level expression of the E7 oncoproteins of HPV-16, HPV-18, and HPV-45 in cervical carcinoma cells. It is also demonstrated that depletion of p16INK4A induces senescence in HeLa but not CaSki or MS-751 cervical carcinoma cells.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Inibidor p16 de Quinase Dependente de Ciclina
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Proliferação de Células
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Células Epiteliais
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Proteínas E7 de Papillomavirus
Limite:
Female
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Humans
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article