Genotoxicity assessment of oxirane-based dental monomers in mammalian cells.
The potential use of oxirane (epoxy) monomers in dental composite development raises the concern to test their genetic safety. Oxiranes can interact with DNA resulting in DNA damage, mutations, and possibly carcinogenesis. Our objective was to evaluate DNA damage and cell-cycle disruption in mammalian cells after exposure to epoxy monomers. The experimental oxiranes were Araldite trade mark GY 281, Cyracure trade mark UVR 6105 and 1,3-dioxane-2,2'-1,3-dioxane-5',4'-bicyclo[4.1.0] heptane (DECHE-TOSU). L929 fibroblast cells were incubated with the monomer for 7 and 24 h at 37 degrees C/5% CO(2). After incubation, cells were subjected to DNA damage alkaline unwinding assay and flow cytometry cell-cycle analysis. Lack of DNA damage and cell-cycle effects were observed with DECHE-TOSU. Exposure to subtoxic doses of Araldite trade mark GY 281 or Cyracure trade mark UVR 6105 caused DNA damage and cell cycle disruption. A significant (p < 0.01) effect for Araldite trade mark GY 281 was observed with cell populations in G1 and G2/M when compared to DMSO solvent control. Similar comparisons revealed significant differences in G2/M cell cycle population after 24-h exposure to 100 microM Cyracure trade mark UVR 6105. For comparison, BISGMA was evaluated to produce DNA damage but without cell-cycle effects suggesting DNA repair mechanisms were effective. Our findings with DECHE-TOSU, Araldite trade mark GY 281 and Cyracure trade mark UVR 6105 indicated cell-cycle disruption followed DNA damage.
University of Missouri-Kansas City, Schools of Dentistry and Pharmacy, School of Pharmacy, 2411 Holmes Street, Kansas City, Missouri 64108, USA. kostoryze@umkc.edu
Elisabet L
EL
Kostoryz
Lori A
LA
Wetmore
William G
WG
Brockmann
David M
DM
Yourtee
J David
JD
Eick
D000818:Animals; D002453:Cell Cycle / Q000502:physiology; D004249:DNA Damage; D003764:Dental Materials / Q000633:toxicity*; D005027:Ethylene Oxide / Q000633:toxicity*; D005347:Fibroblasts; D051379:Mice
D003764:Dental Materials; D005027:Ethylene Oxide