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In vitro cell transformation screening of 4 toluene diamine isomers
Abstract:
2,4-, 2,5-, 2,6- and 3,4-Toluene diamine (TDA) were tested for their ability to enhance the transformation of primary hamster embryo cells (HEC) by Simian adenovirus 7 (SA7) when administered either prior to or after virus inoculation and for their ability to transform secondary HEC. 2,4-TDA was inactive when given prior to SA7, but active if given after. 2,5-TDA was active in both protocols. 2,6-TDA was marginally active if administered before virus and was the most active of the isomers when administered after virus. 3,4-TDA was the most active compound when added prior to SA7, and was also active when given after virus. All the isomers were capable of producing good dose--responses and absolute increases in the number of virus-transformed foci per dish in one or both of the experimental regimens. Each isomer chemically transformed secondary HEC but good dose--responses were rare, and none of the chemicals were active in more than 50% of the 5 or 6 separate tests performed on each.
Insights
Toluene diamine isomers enhanced viral transformation of hamster cells. Some isomers also chemically transformed cells, with varying effectiveness depending on timing and isomer type.
Area of Science:
- Cell biology
- Virology
- Toxicology
Background:
- Toluene diamines (TDA) are chemical compounds with known toxicological properties.
- Simian adenovirus 7 (SA7) is a virus capable of transforming cells.
Purpose of the Study:
- To investigate the ability of different toluene diamine (TDA) isomers to enhance Simian adenovirus 7 (SA7) induced transformation of primary hamster embryo cells (HEC).
- To assess the chemical transforming potential of TDA isomers on secondary HEC.
Main Methods:
- Primary and secondary hamster embryo cells (HEC) were exposed to various TDA isomers.
- Cells were inoculated with Simian adenovirus 7 (SA7) either before or after TDA administration.
- Viral transformation was assessed by counting virus-transformed foci.
- Chemical transformation was evaluated based on dose-response relationships.
Main Results:
- All TDA isomers demonstrated some ability to enhance SA7-mediated transformation of HEC, with effectiveness varying based on isomer and administration timing (pre- or post-virus inoculation).
- 3,4-TDA was most potent when administered prior to SA7, while 2,6-TDA was most active when given after SA7.
- Each TDA isomer induced chemical transformation of secondary HEC, but consistent dose-responses were infrequent, and activity was observed in less than 50% of tests for each isomer.
Conclusions:
- Toluene diamine isomers exhibit differential effects on viral cell transformation, influenced by isomer structure and timing of exposure relative to viral inoculation.
- TDA isomers possess chemical carcinogenicity, capable of transforming cells independently of viral activity, though with variable potency and reproducibility.