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Genotoxic effects of ethylene oxide and propylene oxide: a comparative study
E Agurell1, H Cederberg, L Ehrenberg
1Department of Genetic and Cellular Toxicology, Stockholm University, Sweden.
Mutation Research
|September 1, 1991
Summary
Ethylene oxide (EO) and propylene oxide (PO) showed varying genotoxic effectiveness. EO was significantly more potent in yeast gene mutation assays, while both agents were equally effective in bacterial point mutation and human lymphocyte SCE tests.
Area of Science:
- Toxicology
- Genetics
- Molecular Biology
Background:
- Ethylene oxide (EO) and propylene oxide (PO) are alkylating agents with differing genotoxic profiles.
- Previous studies indicated EO induces chromosomal aberrations, while PO does not, after chronic monkey exposure.
- Understanding these differences is crucial for risk assessment.
Purpose of the Study:
- To compare the genotoxic effectiveness of ethylene oxide (EO) and propylene oxide (PO) across multiple test systems.
- To investigate the differential genotoxicity observed in primate studies.
- To elucidate potential mechanisms underlying the observed differences in genotoxicity.
Main Methods:
- Comparative genotoxicity assays using various model systems.
- Assays included gene conversion and reverse mutation in Saccharomyces cerevisiae (yeast).
- Point mutation assays in Salmonella typhimurium (bacteria) and sister-chromatid exchange (SCE) in human lymphocytes were also performed.
Main Results:
- Ethylene oxide (EO) demonstrated 5-10 times greater effectiveness than propylene oxide (PO) in yeast gene conversion and reverse mutation assays.
- Both EO and PO exhibited similar abilities to induce point mutations in S. typhimurium.
- The induction of sister-chromatid exchange (SCE) in human lymphocytes was comparable for both EO and PO.
Conclusions:
- Genotoxic effectiveness of EO and PO is test-system dependent.
- Differences in genotoxicity may relate to DNA strand-breaking capabilities following alkylation.
- Further research is needed to fully understand the mechanisms of EO and PO genotoxicity.
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