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Dose and frequency effect in mouse skin tumor promotion
I Chouroulinkov1, C Lasne, R Lowy
1Institut de Recherche Scientifique sur le Cancer, Villejuif, France.
Cancer Research
|April 15, 1989
Summary
This study investigated how tumor promoter dose and application frequency affect tumor development in mice. Results show a clear dose-response and frequency-response relationship for skin papilloma incidence, with less frequent applications yielding fewer tumors.
Area of Science:
- Carcinogenesis research
- Toxicology
- Dermatology
Background:
- Tumor development is influenced by carcinogen dose and application frequency.
- Understanding these factors is crucial for risk assessment and prevention strategies.
Purpose of the Study:
- To investigate the influence of dose and application frequency of tumor promoters on skin carcinogenesis.
- To establish dose-response and frequency-response relationships for tumor development.
Main Methods:
- A large-scale mouse skin two-stage carcinogenesis experiment was conducted on 1110 CD-1 mice.
- Mice were treated with benzo(a)pyrene followed by varying doses and frequencies of 12-O-tetradecanoylphorbol-13-acetate (TPA).
- TPA application frequencies included daily, every 2nd, 4th, 8th, or 16th day, with doses ranging from 0.1 to 3.2 micrograms.
Main Results:
- A clear dose-response relationship was observed for TPA at fixed application frequencies.
- A significant frequency-response relationship was found for TPA at fixed doses.
- TPA applications every 4th and 8th day generally resulted in a lower number of tumors compared to more frequent applications, even with the same total dose.
Conclusions:
- Both the dose and application frequency of tumor promoters significantly impact skin carcinogenesis.
- Less frequent application of tumor promoters may lead to reduced tumor incidence.
- These findings contribute to understanding the dynamics of chemical carcinogenesis and inform risk assessment.