Evaluation of the mutagenic effects of myosmine in human lymphocytes using the HPRT gene mutation assay

• Published in: Food and chemical toxicology Vol. 47; no. 1; pp. 237 - 241
• Main Authors: Havla, J.B., Hill, C.E., Abdel-Rahman, S.Z., Richter, E.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 2009; Elsevier
• Subjects: Alkaloids - chemistry; Alkaloids - toxicity; Biological and medical sciences; Chemical mutagenesis; DNA Damage; HPRT mutation assay; Human lymphocytes; Humans; Hypoxanthine Phosphoribosyltransferase - genetics; Lymphocytes - drug effects; Medical sciences; Mutagenicity Tests; Mutation; Myosmine; Nitrosamines - chemistry; Nitrosamines - metabolism; Toxicology; CE; POB; MGMT; HPRT mutation assay; NNK; HPRT; NNN; O 6-POB-dGuo; NNAL; TSNA; MF; HPB; Human lymphocytes; Myosmine; Human; Evaluation; Enzyme; Toxicity; Transferases; Glycosyltransferases; Hypoxanthine phosphoribosyltransferase; Mutagen; Gene; Genetics; Mutation; Pentosyltransferases; Lymphocyte
• ISSN: 0278-6915; 1873-6351; 1873-6351
• DOI: 10.1016/j.fct.2008.11.008

The minor tobacco alkaloid myosmine is implicated in DNA damage through pyridyloxobutylation similar to the tobacco-specific nitrosamines (TSNA). In contrast to TSNA, occurrence of myosmine is not restricted to tobacco. Myosmine is genotoxic to human cells in the comet assay. In this study, the mutagenic effect of myosmine was evaluated using the cloning hypoxanthine-guanine phosphoribosyltransferase ( HPRT) gene mutation assay. Four hour exposure of isolated peripheral blood lymphocytes from 14 subjects homozygous for the Leu84 wild-type of the O 6-methylguanine-DNA-methyltransferase ( MGMT) gene to 1 mM of myosmine increased mutant frequency from 0.73 ± 0.58 × 10 −6 in control to 1.14 ± 0.89 × 10 −6 lymphocytes ( P < 0.05). These new data further confirm the mutagenic effects of myosmine.