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Human papillomavirus oncogenesis.
1Department of Laboratory Medicine and Pathology, University of Minnesota Medical School, Minneapolis, USA. mcgle001@tc.umn.edu
Clinics in Laboratory Medicine
|June 23, 2000
Summary
Human papillomaviruses (HPVs) can cause genetic instability and cancer through viral DNA integration. Oncogenic HPVs like 16 and 18, unlike nononcogenic types, promote malignancies by disrupting cell cycle controls.
Area of Science:
- Virology
- Oncology
- Molecular Biology
Background:
- Human papillomaviruses (HPVs) manipulate host cell processes for replication.
- Viral genome integration into host DNA can lead to genetic instability.
- HPV integration is a key event in the development of HPV-associated malignancies.
Purpose of the Study:
- To investigate the mechanisms by which HPVs contribute to cancer development.
- To differentiate the cellular effects of oncogenic versus nononcogenic HPV types.
- To identify the viral genes responsible for altering host cell proliferation and differentiation.
Main Methods:
- In vitro studies using primary and immortalized cells.
- Classification of HPV types into oncogenic (e.g., HPV 16, 18) and nononcogenic (e.g., HPV 6, 11) groups.
- Analysis of viral oncogene function (E6 and E7) and their interaction with host cell cycle regulators (p53, pRb).
Main Results:
- Two distinct classes of genital HPV types were identified: oncogenic and nononcogenic.
- Oncogenic HPVs (HPV 16, 18) were shown to immortalize cells and transform them.
- Nononcogenic HPVs (HPV 6, 11) did not induce irreversible growth properties through the same viral genes.
Conclusions:
- HPV integration potentiates malignancy development.
- Oncogenic HPV types E6 and E7 proteins disrupt cell cycle checkpoints by inhibiting p53 and pRb.
- Nononcogenic HPV types lack the ability to induce malignant transformations via these specific mechanisms.