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Human papillomaviruses in non-melanoma skin cancer
E M de Villiers1, A Ruhland, P Sekarić
1Division for Tumour-virus Characterization, Research Programme Applied Tumour-virology, Deutsches Krebsforschungszentrum, Im Neuenheimer Feld 242, Heidelberg, 69120, Germany.
Abstract:
Recent data suggest that additional factors, other than UV radiation, are involved in the etiology of non-melanoma skin cancer. These include alterations in the tumor suppressor genes, p53, p16$L*I*U$LINK4a$L*I$L/CDKN2A, p21$L*I*U$LWAF1/CIP1$L*I$L and the PTCH gene, as well as cytokines. Papillomavirus infections have been implicated in the etiology of non-melanoma skin cancer. The interaction of tumor suppressor genes and cytokines with the oncoproteins of high-risk mucosal HPV types have been studied in detail, but very little is known about the cutaneous HPV types. We have studied the effect of UV radiation on the URRs of HPV 1, 2, 3, 5, 7, 20, 23, 27, 38, 41, and 77. Neither the CAT-expression and promoter activity of these HPV types, nor presence or absence of wild-type or mutated p53 in the cell lines used, could be related to the DNA sequence homology between the different HPV types or their biological behavior.
Insights
This study investigated the impact of UV radiation on various human papillomavirus (HPV) types, exploring their role in non-melanoma skin cancer. Findings indicate no direct correlation between HPV type, UV effects, and tumor suppressor gene interactions.
Area of Science:
- Oncology
- Virology
- Dermatology
Background:
- Non-melanoma skin cancer (NMSC) etiology involves factors beyond UV radiation, including tumor suppressor gene alterations (p53, p16INK4a/CDKN2A, p21WAF1/CIP1) and cytokines.
- Papillomavirus infections are implicated in NMSC, with known interactions between tumor suppressor genes, cytokines, and high-risk mucosal HPV oncoproteins.
- Limited knowledge exists regarding cutaneous HPV types and their interactions with cellular mechanisms relevant to skin carcinogenesis.
Purpose of the Study:
- To investigate the effect of UV radiation on the upstream regulatory regions (URRs) of specific cutaneous HPV types.
- To determine if CAT-expression, promoter activity, or p53 status correlate with HPV DNA sequence homology or biological behavior.
- To elucidate the role of cutaneous HPV types in NMSC development, considering UV radiation and genetic factors.
Main Methods:
- Analysis of UV radiation effects on the URRs of HPV types 1, 2, 3, 5, 7, 20, 23, 27, 38, 41, and 77.
- Assessment of CAT-expression and promoter activity for these HPV types.
- Evaluation of wild-type and mutated p53 presence in cell lines used for the study.
Main Results:
- No correlation was found between CAT-expression and promoter activity of the studied HPV types and their DNA sequence homology.
- The presence or absence of wild-type or mutated p53 in cell lines did not correlate with the biological behavior of the HPV types.
- UV radiation effects on URRs did not show a clear relationship with HPV sequence homology or biological behavior.
Conclusions:
- The study found no direct link between UV radiation effects on URRs, HPV sequence homology, and p53 status in the context of cutaneous HPV types.
- Findings suggest that the biological behavior of these cutaneous HPV types, in relation to UV and p53, is not explained by simple sequence homology.
- Further research is needed to fully understand the complex interplay of cutaneous HPV, UV radiation, and genetic factors in NMSC etiology.