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Drug Metabolism Letters


ISSN (Print): 1872-3128
ISSN (Online): 1874-0758

Metabolism of Nicotine and 4-(methylnitrosamino)-l-(3-pyridyl)-lbutanone (NNK) in Menthol and Non-menthol Cigarette Smokers

Author(s): Mohamadi Sarkar, Jingzhu Wang and Qiwei Liang

Volume 6, Issue 3, 2012

Page: [198 - 206] Pages: 9

DOI: 10.2174/1872312811206030007

Price: $65


Purpose: Menthol in cigarettes has been suggested to inhibit metabolism of nicotine and 4-(methylnitrosamino)-1- (3-pyridyl)-1-butanone (NNK). The objective of this study was to investigate the glucuronide metabolite ratios (MR) for nicotine (NICGLUC/NIC), cotinine (COTGLUC/COT), trans 3’-hydroxy cotinine (3OHCOTGLUC/3OHCOT). 4- methylnitrosamino-1-(3-pyridyl)-1-butanol (NNAL – NNALGLUC/NNAL); and the ratio of trans 3’-hydroxy cotinine to cotinine (3OHCOT/COT) between adult menthol and non-menthol smokers (AS).

Methods: The data was collected from the Total Exposure Study (TES), a stratified, multi-center, cross-sectional study that included 3,585 AS and 1,077 non-smokers. Daily urinary excretion of nicotine and five metabolites, NNAL and NNAL glucuronides, and serum cotinine were measured in the AS. The analysis included 1044 menthol (448 African- Americans, AA) and 2297 non-menthol (161 AA) AS.

Results: Smoking mentholated cigarettes did not decrease any of the MR. Race was the most important significant main effect for all the MRs. AAs exhibited statistically significantly lower NICGLUC/NIC, COTGLUC/COT, NNALGLUC/ NNAL and 3OHCOT/COT, but higher 3OHCOTGLUC/3OHCOT compared to Whites. Age, liver function, alcoholic beverages, etc., were some of the other significant effects for some MRs. Menthol was not a statistically significant effect, e.g. the adjusted mean NNALGLUC/NNAL between menthol and non-menthol AS was 2.93 vs. 2.80 (p>0.05, AA) and 3.38 vs. 3.35 (p>0.05, Whites). The models only explained 2.6-12.6% of the MR variability. Number of cigarettes was the most important factor affecting serum cotinine levels.

Conclusions: Menthol does not inhibit the metabolism of nicotine or NNK. The daily exposure of related constituents is primarily influenced by number of cigarettes smoked per day.

Keywords: NNK, NNAL, nicotine, serum cotinine, metabolism, menthol, non-menthol cigarettes.

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