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In vitro mutagenicity and cell-transformation screening of N-(2,3-epoxy-propyl)-phthalimide
Abstract:
N-(2,3-Epoxy-propyl)-phthalimide (EPP) was tested for genetic activity in the Salmonella/microsome mutagenicity test. Concentration-dependent mutagenicity was demonstrated in S. typhimurium strains TA1535, TA1537 and TA100 with and without rat S9. It was inactive in strain TA1538, and active without rat S9 in TA98 at the high dose. EPP induced 6-thioguanine-resistant mutants of Chinese hamster ovary cells in the absence of an exogenous activating system. EPP produced dose-dependent enhancement of SA7 virus transformation of primary hamster-embryo cells, and transformed secondary hamster-embryo cells in a non-dose-related fashion. At a dose of 5 g/kg p.o. or i.m., EPP was inactive in the host-mediated assay using C57Bl/6XC3H mice and S. typhimurium strain TA1535. Murine testicular DNA synthesis was not inhibited by oral administration of EPP at 1000 mg/kg.
Insights
N-(2,3-Epoxy-propyl)-phthalimide (EPP) showed mutagenic activity in bacterial tests and induced mutations in mammalian cells. However, it was not mutagenic in a host-mediated assay or inhibitory to DNA synthesis in mice.
Area of Science:
- Toxicology
- Genetic Toxicology
- Chemical Mutagenesis
Background:
- N-(2,3-Epoxy-propyl)-phthalimide (EPP) is a chemical compound requiring evaluation for potential genetic hazards.
- Understanding the genotoxic potential of EPP is crucial for assessing its safety profile.
Purpose of the Study:
- To comprehensively assess the genetic activity of N-(2,3-Epoxy-propyl)-phthalimide (EPP) across various in vitro and in vivo models.
- To determine if EPP exhibits mutagenicity, clastogenicity, or other genotoxic effects.
Main Methods:
- Salmonella/microsome mutagenicity assay (Ames test) with multiple S. typhimurium strains, with and without rat liver S9 fraction.
- In vitro mammalian cell assays, including induction of 6-thioguanine-resistant mutants in Chinese hamster ovary (CHO) cells and SA7 virus-mediated cell transformation assays.
- In vivo host-mediated assay using mice and S. typhimurium, and assessment of murine testicular DNA synthesis.
Main Results:
- EPP demonstrated concentration-dependent mutagenicity in S. typhimurium strains TA1535, TA1537, and TA100, with and without metabolic activation.
- Mutagenic activity was observed in TA98 at high doses without S9, and EPP induced mutations in CHO cells and enhanced viral transformation in hamster embryo cells.
- EPP was inactive in the host-mediated assay and did not inhibit murine testicular DNA synthesis at tested doses.
Conclusions:
- N-(2,3-Epoxy-propyl)-phthalimide (EPP) exhibits mutagenic potential in bacterial systems and genotoxic effects in mammalian cells in vitro.
- Despite in vitro findings, EPP did not show genotoxicity in vivo under the conditions of the host-mediated assay.
- Further investigation may be warranted to fully elucidate the in vivo genotoxic risk of EPP.