HPV-inactive cell populations arise from HPV16-transformed human keratinocytes after p53 knockout.
Virology
; 554: 9-16, 2021 02.
Article
em En
| MEDLINE
| ID: mdl-33321328
ABSTRACT
HPV-inactive head and neck and cervical cancers contain HPV DNA but do not express HPV E6/E7. HPV-positive primary head and neck tumors usually express E6/E7, however they may produce HPV-inactive metastases. These observations led to our hypothesis that HPV-inactive cancers begin as HPV-active lesions, losing dependence on E6/E7 expression during progression. Because HPV-inactive cervical cancers often have mutated p53, we investigated whether p53 loss may play a role in the genesis of HPV-inactive cancers. p53 knockout (p53-KO) by CRISPR-Cas9 resulted in a 5-fold reduction of E7 mRNA in differentiation-resistant HPV16 immortalized human keratinocytes (HKc/DR). E7 expression was restored by 5-Aza-2 deoxycytidine in p53 KO lines, suggesting a role of DNA methylation in this process. In-situ hybridization showed that p53 KO lines consist of mixed populations of E6/E7-positive and negative cells. Hence, loss of p53 predisposes HPV16 transformed cells to losing dependence on the continuous expression of HPV oncogenes for proliferation.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Proteínas Repressoras
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Queratinócitos
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Transformação Celular Viral
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Proteínas Oncogênicas Virais
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Proteína Supressora de Tumor p53
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Papillomavirus Humano 16
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Proteínas E7 de Papillomavirus
Limite:
Humans
Idioma:
En
Ano de publicação:
2021
Tipo de documento:
Article