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Genotoxicity evaluation of trimethylbenzenes
E Janik-Spiechowicz1, K Wyszyńska, E Dziubałtowska
1Department of Toxicology and Carcinogenesis, The Nofer Institute of Occupational Medicine, Lodz, Poland.
Mutation Research
|May 26, 1998
Summary
The genotoxicity of benzene trimethyl isomers was studied. Only 1,2,3-TMB showed mutagenic effects in bacterial tests, while all isomers increased sister chromatid exchange in mice, indicating limited genotoxic potential.
Area of Science:
- Toxicology and Environmental Health
- Genetics and Molecular Biology
Background:
- Benzene trimethyl isomers (hemimellitene, 1,2,3-TMB; pseudocumene, 1,2,4-TMB; and mesitylene, 1,3,5-TMB) are industrial chemicals.
- Assessing their genotoxicity is crucial for understanding potential health risks.
Purpose of the Study:
- To evaluate the genotoxicity of three benzene trimethyl isomers.
- To investigate their mutagenic and clastogenic potential using in vitro and in vivo assays.
Main Methods:
- In vitro: Ames test using Salmonella typhimurium strains with and without S9 metabolic activation.
- In vivo: Micronucleus test and sister chromatid exchange (SCE) assay in bone marrow cells of mice.
Main Results:
- 1,2,3-TMB demonstrated mutagenic activity in Salmonella typhimurium strains, particularly TA97a, without metabolic activation.
- No isomer affected the frequency of micronucleated erythrocytes.
- All three isomers (1,2,3-TMB, 1,2,4-TMB, and 1,3,5-TMB) induced a significant increase in SCE levels in mouse bone marrow cells.
Conclusions:
- Limited evidence suggests genotoxic activity for 1,2,3-TMB.
- Inadequate evidence indicates genotoxic activity for 1,2,4-TMB and 1,3,5-TMB.
- All isomers possess cytogenetic potential, as evidenced by SCE induction.