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Human papillomavirus type 16 E6 gene cooperates with EJ-ras to immortalize primary mouse cells
Oncogene
|April 1, 1993
Summary
Human papillomaviruses (HPVs) can cause cervical cancer. The HPV-16 E6 gene, along with EJ-ras, immortalizes mouse cells, suggesting p53 gene mutations can replace E6 function in cell transformation.
Area of Science:
- Oncology
- Virology
- Molecular Biology
Background:
- Human papillomaviruses (HPVs) are DNA tumor viruses linked to cervical cancer.
- Viral E6 and E7 proteins interact with tumor suppressors p53 and retinoblastoma gene products, respectively.
Purpose of the Study:
- To investigate the role of HPV-16 E6 in cell immortalization.
- To explore the functional relationship between HPV-16 E6 and p53 in cell transformation.
Main Methods:
- Co-cultivation of primary mouse kidney epithelial cells with HPV-16 E6 and EJ-ras.
- Analysis of p53 protein levels in immortalized cell lines.
- Mutation analysis of the p53 gene in EJ-ras-immortalized cells.
Main Results:
- HPV-16 E6 cooperated with EJ-ras to immortalize primary mouse kidney epithelial cells.
- HPV-16-immortalized cells expressing E6 showed low wild-type p53 levels.
- EJ-ras-immortalized cells had elevated p53 and harbored p53 gene mutations.
Conclusions:
- Activating mutations in the p53 gene can functionally substitute for HPV-16 E6 in transforming primary cells.
- This suggests a critical role for p53 pathway alterations in HPV-associated carcinogenesis.