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Expression and localization of human papillomavirus type 16 E6 and E7 open reading frame proteins in human epidermal
1Department of Biochemistry, Yonsei University, College of Medicine, Seoul, Korea.
Yonsei Medical Journal
|March 1, 1994
Summary
High-risk human papillomavirus (HPV) E6 and E7 proteins were localized to the cytoplasm of keratinocytes. This cytoplasmic retention may disrupt tumor suppressor functions, leading to abnormal cell growth.
Area of Science:
- Oncology
- Virology
- Cell Biology
Background:
- Over 60 human papillomavirus (HPV) types exist, classified by malignant progression risk.
- High-risk HPVs express E6 and E7 transforming proteins, crucial for oncogenesis.
- Previous studies on E6/E7 protein localization are controversial.
Purpose of the Study:
- To investigate the cellular localization of HPV type 16 E6 and E7 proteins.
- To understand the mechanism of E6/E7 oncoprotein activity in keratinocytes.
Main Methods:
- Expression of HPV type 16 E6 or E7 open reading frame (ORF) proteins in human epidermal keratinocytes (RHEK-1) using a vaccinia virus vector.
- Immunofluorescence detection utilizing monoclonal antibodies against E6/E7 ORF proteins.
Main Results:
- HPV type 16 E6 and E7 proteins were localized to the cytoplasm of RHEK-1 cells.
- This suggests E6/E7 proteins bind to tumor suppressors, inhibiting nuclear transport.
Conclusions:
- Cytoplasmic retention of E6/E7 proteins may lead to their degradation via systems like ubiquitination.
- Disruption of tumor suppressor function by E6/E7 proteins can result in uncontrolled cell growth and potential oncogenesis.