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Aneuploidy, an early event in mouse skin tumor development
Carcinogenesis
|November 1, 1986
Summary
Chromosomal alterations, specifically aneuploidy, are present in early mouse skin papillomas and become dominant in squamous cell carcinomas (SCC). This genomic instability may drive the progression from benign tumors to malignant cancer.
Area of Science:
- Oncology
- Genetics
- Carcinogenesis
Background:
- Chromosomal alterations are implicated in mouse skin carcinogenesis.
- Tumor promoters may act via chromosomal changes, influencing benign to malignant conversion.
- Direct evidence of tumor chromosomal constitution has been lacking.
Purpose of the Study:
- To investigate the chromosomal constitution of mouse skin tumors during carcinogenesis.
- To determine if aneuploidy is associated with tumor progression and malignant conversion.
Main Methods:
- Analysis of chromosomal content in early and late-stage papillomas.
- Cytogenetic evaluation of chemically induced squamous cell carcinomas (SCC).
Main Results:
- Aneuploid cells were detected in very early papillomas.
- Aneuploid clones progressively replaced the diploid stem line in later stages.
- Induced squamous cell carcinomas (SCC) exhibited high levels of aneuploidy.
Conclusions:
- Aneuploidy is an early event in mouse skin carcinogenesis.
- Genomic imbalance resulting from aneuploidy is strongly associated with the malignant conversion of benign papillomas to SCC.