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Detection of non-genotoxic carcinogens in the BALB/c 3T3 cell transformation/mutation assay system
D J Fitzgerald1, C Piccoli, H Yamasaki
1Programme of Multistage Carcinogenesis, International Agency for Research on Cancer, Lyon, France.
Abstract:
We have employed BALB/c 3T3 cells in a simultaneous cell transformation and mutation assay protocol to see whether both genotoxic and non-genotoxic carcinogens can be identified. Three known mutagenic animal carcinogens tested positive for transforming activity: dimethylnitrosamine, methylcholanthrene and methylnitrosourea. In addition, we tested three non-mutagenic compounds--two human carcinogens, benzene and diethylstilbestrol, and the possible human carcinogen dichlorodiphenyltrichloroethane; all three displayed transforming activity. These results add to existing data supporting the validity of the BALB/c 3T3 cell transformation system as a reliable short-term in vitro test for carcinogens in general, and for non-genotoxic carcinogens in particular.
Insights
The BALB/c 3T3 cell transformation assay effectively identifies both genotoxic and non-genotoxic carcinogens. This reliable in vitro test shows promise for carcinogen screening, particularly for non-mutagenic compounds.
Area of Science:
- Toxicology
- Cell Biology
- Carcinogenesis
Background:
- Carcinogen identification is crucial for public health.
- Distinguishing between genotoxic and non-genotoxic carcinogens is challenging.
- Short-term in vitro assays are needed for efficient carcinogen screening.
Purpose of the Study:
- To evaluate the BALB/c 3T3 cell transformation assay for identifying both genotoxic and non-genotoxic carcinogens.
- To validate the assay's reliability as a short-term in vitro test for carcinogens.
Main Methods:
- Utilized BALB/c 3T3 cells in a simultaneous cell transformation and mutation assay.
- Tested known mutagenic animal carcinogens (dimethylnitrosamine, methylcholanthrene, methylnitrosourea).
- Tested non-mutagenic compounds including human carcinogens (benzene, diethylstilbestrol) and a possible human carcinogen (dichlorodiphenyltrichloroethane).
Main Results:
- Three mutagenic carcinogens showed positive transforming activity.
- Three non-mutagenic compounds, including human carcinogens, also displayed transforming activity.
- The BALB/c 3T3 cell transformation system demonstrated effectiveness for both types of carcinogens.
Conclusions:
- The BALB/c 3T3 cell transformation system is a valid and reliable short-term in vitro test for carcinogens.
- The assay is particularly effective for identifying non-genotoxic carcinogens.
- This method supports broader carcinogen identification and risk assessment.