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Interferon response depends on viral transcription in human papillomavirus-containing lesions
1Department of Microbiology, University of Texas Medical Branch, Galveston 77555-1019, USA.
Abstract:
Human papillomaviruses (HPVs) express various proteins which have been proven to interact with some cellular functions playing a role in cell cycle progression and differentiation. Therefore, these viral gene products might be candidates for interfering with IFN-mediated antiproliferative actions. Condyloma biopsies from patients subsequently demonstrated to be responsive or non-responsive to IFN treatment were investigated. mRNA levels of HPV genes and IFN-responsive genes were determined by RT-PCR and correlated with IFN responsiveness. Patients clinically nonresponsive to IFN demonstrated a characteristic HPV transcriptional activity differing from responder patients. Nonresponders expressed mostly early E7 mRNAs; responders demonstrated higher expression of the late L1 gene. This differential transcription of infecting HPV also correlated with the extent of IFN mediated antiproliferative effect. A hypothesis for further study is that HPV E7 may inhibit IFN responsiveness, while HPV L1 may promote IFN responsiveness.
Insights
Human papillomaviruses (HPVs) impact interferon (IFN) treatment response. Non-responsive patients showed high E7 gene activity, while responders had high L1 gene activity, suggesting viral gene roles in treatment outcomes.
Area of Science:
- Virology and Immunology
- Oncology
- Cell Biology
Background:
- Human papillomaviruses (HPVs) proteins influence cellular functions, including cell cycle and differentiation.
- These viral proteins may interfere with interferon (IFN)-mediated antiproliferative effects, crucial in cancer therapy.
Purpose of the Study:
- To investigate the correlation between HPV gene expression and patient response to IFN treatment.
- To explore the potential role of specific HPV genes (E7 and L1) in modulating IFN responsiveness.
Main Methods:
- Analysis of condyloma biopsies from patients with known IFN treatment responsiveness.
- Quantification of mRNA levels for HPV genes and IFN-responsive genes using Reverse Transcription Polymerase Chain Reaction (RT-PCR).
- Correlation of gene expression patterns with clinical IFN responsiveness.
Main Results:
- Distinct HPV transcriptional profiles were observed between IFN-responsive and non-responsive patients.
- Non-responsive patients predominantly expressed early E7 mRNAs, whereas responders showed higher late L1 gene expression.
- Differential HPV gene transcription correlated with the degree of IFN-mediated antiproliferative effects.
Conclusions:
- HPV transcriptional activity differs significantly based on IFN treatment response.
- Hypothesis: HPV E7 may inhibit IFN responsiveness, while HPV L1 may promote it.
- Findings suggest HPV gene products as potential targets for improving IFN therapy efficacy.