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Estimation and analysis of the concentration-response surfaces associated with multiple-agent combinations
Toxicology and Applied Pharmacology
|September 15, 1986
Summary
This study investigated the genotoxicity of ethylnitrosourea (ENU) and cis-diamminedichloroplatinum(II) (DDP) in combination. The findings reveal a less-than-additive genotoxic effect when these agents are used together at increasing concentrations.
Area of Science:
- Toxicology
- Genetics
- Biostatistics
Background:
- Ethylnitrosourea (ENU) and cis-diamminedichloroplatinum(II) (DDP) are known genotoxic agents.
- Understanding the combined effects of genotoxic agents is crucial for risk assessment.
Purpose of the Study:
- To evaluate the genotoxicity of ENU and DDP, individually and in combination, in Chinese hamster V79 cells.
- To analyze the interaction between ENU and DDP using response surface methodology.
Main Methods:
- Chinese hamster V79 cells were treated with varying concentrations of ENU and DDP.
- Sister chromatid exchanges (SCEs) were quantified as a measure of genotoxicity.
- A polynomial model based on negative binomial distribution was used to analyze the interaction data.
Main Results:
- The combination of ENU and DDP exhibited a less-than-additive genotoxic effect.
- This less-than-additive effect increased with higher concentrations of both agents.
- The negative binomial distribution was necessary due to extra-Poisson variability in SCE events.
Conclusions:
- The statistical methodology employed is effective for analyzing interactions between multiple cytotoxic agents.
- This approach can be applied to various endpoints and multiple treatment agents.
- The findings highlight complex interactions in genotoxicity assessment.