Genotoxicity of acrylamide and glycidamide

Journal of the National Cancer Institute
Ahmad Besaratinia, Gerd P Pfeifer

Abstract

Acrylamide, a known rodent carcinogen, is found in the human diet. However, the mechanism by which acrylamide exerts its carcinogenic effects remains unclear. Normal human bronchial epithelial cells and Big Blue mouse embryonic fibroblasts that carry a lambda phage cII transgene were treated in vitro with acrylamide, its primary epoxide metabolite glycidamide, or water (control) and then subjected to terminal transferase-dependent polymerase chain reaction to map the formation of DNA adducts within the human gene encoding p53 (TP53) and the cII transgene. The frequency and spectrum of glycidamide-induced mutations in cII were examined by using a lambda phage-based mutation detection system and DNA sequence analysis, respectively. All statistical tests were two-sided. Acrylamide and glycidamide formed DNA adducts at similar specific locations within TP53 and cII, and DNA adduct formation was more pronounced after glycidamide treatment than after acrylamide treatment at all doses tested. Acrylamide-DNA adduct formation was saturable, whereas the formation of most glycidamide-DNA adducts was dose-dependent. Glycidamide treatment dose-dependently increased the frequency of cII mutations relative to control treatment (P<.001). Glyci...Continue Reading

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