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Multistage carcinogenesis in the skin
S H Yuspa1, A A Dlugosz, M F Denning
1Laboratory of Cellular Carcinogenesis and Tumor Promotion, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892-4355, USA.
Summary
Mouse skin cancer models reveal how genetic changes drive carcinogenesis. Suppressing transforming growth factor beta (TGF-β) accelerates tumor progression, highlighting its role in preventing squamous cell carcinoma development.
Area of Science:
- Oncology
- Molecular Biology
- Dermatology
Background:
- Squamous cell carcinoma (SCC) multistage evolution is studied using mouse skin models.
- Keratinocyte cell culture models replicate genetic and epigenetic events in skin carcinogenesis.
- Understanding these events offers insights into the biochemistry of cancer development.
Purpose of the Study:
- To dissect biological and genetic changes contributing to specific stages of skin carcinogenesis.
- To investigate the role of v-rasHa oncogene and transforming growth factor beta (TGF-β) in SCC development.
- To identify critical genetic alterations promoting premalignant progression.
Main Methods:
- Transduction of normal mouse keratinocytes with the v-rasHa oncogene.
- Development of keratinocyte cell culture models for multistage carcinogenesis.
- Genetic manipulation of TGF-β1 gene in keratinocytes.
Main Results:
- v-rasHa transduction induced papilloma phenotype with high proliferation and aberrant differentiation.
- Absence of TGF-β in premalignant tumors correlated with high risk of malignant progression.
- Genetically null TGF-β1 keratinocytes rapidly progressed to SCC when transduced with v-rasHa, showing increased gene amplification.
Conclusions:
- v-rasHa oncogene and TGF-β1 absence are critical factors in SCC progression.
- TGF-β1 suppresses gene amplification, a key event in premalignant progression.
- This mouse model effectively identifies genetic changes driving premalignant progression in skin cancer.