Alpha- and betapapillomavirus E6/E7 genes differentially modulate pro-inflammatory gene expression.
Marco De Andrea1, Michele Mondini, Barbara Azzimonti
1Department of Public Health and Microbiology, Medical School of Torino,Via Santena 9, 10126 Torino, Italy.
Virus Research
|November 3, 2006
Summary
Different human papillomavirus (HPV) oncoproteins differentially regulate inflammatory responses in keratinocytes. Alpha- and beta-HPV genotypes impact cytokine and chemokine expression, influencing immune responses in HPV-associated skin diseases.
Area of Science:
- Immunology
- Virology
- Dermatology
Background:
- Keratinocytes are the primary target cells for human papillomavirus (HPV).
- HPV infection can modulate keratinocyte cytokine production, impacting immune responses.
- The differential effects of various HPV genotypes on keratinocyte inflammatory signaling remain unclear.
Purpose of the Study:
- To investigate how oncoproteins from different HPV genotypes (alpha- and beta-HPV) affect the expression of pro-inflammatory molecules in keratinocytes.
- To compare the inflammatory profiles induced by HPV5, HPV16, and HPV38 oncoproteins.
- To elucidate genotype-specific mechanisms of HPV-induced immune modulation in skin.
Main Methods:
- Primary human keratinocytes and HaCaT cells were transduced with HPV5, HPV16, or HPV38 E6/E7 oncoproteins.
- Expression levels of interleukin-8 (IL-8), monocyte chemoattractant protein-1 (MCP-1), and intercellular adhesion molecule-1 (ICAM-1) were measured.
- Inducible nitric oxide synthase (iNOS) expression and nitric oxide (NO) production were assessed.
Main Results:
- HPV5 E6/E7 significantly induced IL-8, MCP-1, and ICAM-1 expression.
- HPV16 E6/E7 down-regulated or did not modulate these pro-inflammatory molecules.
- HPV38 oncoproteins showed lower induction of these molecules, similar to HPV16, while all tested genotypes induced iNOS and NO production.
- Significant differences in pro-inflammatory molecule expression were observed between alpha- and beta-HPV genotypes.
Conclusions:
- HPV oncoproteins exhibit distinct genotype-specific effects on keratinocyte inflammatory responses.
- These findings highlight the diverse biological activities of HPV genotypes and their role in HPV-associated skin diseases.
- Understanding these differential immune modulation mechanisms is crucial for developing targeted therapeutic strategies.
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