Journal article
Association between Glucuronidation Genotypes and Urinary NNAL Metabolic Phenotypes in Smokers
Cancer epidemiology, biomarkers & prevention, Vol.25(7), pp.1175-1184
07/2016
Handle:
https://hdl.handle.net/2376/104353
PMCID: PMC5087993
PMID: 27197298
Abstract
The most abundant and potent carcinogenic tobacco-specific nitrosamine in tobacco and tobacco smoke is 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK). In vivo, NNK is rapidly metabolized to both the (R)- and (S)-enantiomers of 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol (NNAL), which possesses similar carcinogenic properties as NNK. The major detoxification pathway for both NNAL enantiomers is glucuronidation by UDP-glucuronosyltransferase (UGT) enzymes including UGT2B10 and UGT2B17. The goal of the present study was to directly examine the role of UGT genotypes on urinary levels of NNAL glucuronides in smokers.
NNAL-N-Gluc, (R)-NNAL-O-Gluc, (S)-NNAL-O-Gluc, and free NNAL were simultaneously and directly quantified in the urine of smokers by LC/MS analysis. Genotypes were determined by TaqMan assay using genomic DNA.
The functional knockout polymorphism in the UGT2B10 gene at codon 67 (Asp>Tyr) was significantly (P < 0.0001) associated with a 93% decrease in creatinine-adjusted NNAL-N-Gluc. The polymorphic whole-gene deletion of the UGT2B17 gene was associated with significant (P = 0.0048) decreases in the levels of creatinine-adjusted (R)-NNAL-O-Gluc, with a 32% decrease in the levels of urinary (R)-NNAL-O-Gluc/(S)-NNAL-O-Gluc among subjects with the UGT2B17 (*2/*2) genotype as compared to subjects with the UGT2B17 (*1/*1) genotype.
These results suggest that functional polymorphisms in UGT2B10 and UGT2B17 are associated with a reduced detoxification capacity against NNAL and may therefore affect individual cancer risk upon exposure to tobacco.
This is the first report to clearly demonstrate strong genotype-phenotype associations between both the UGT2B10 codon 67 Asp<Tyr genotype and urinary NNAL-N-Gluc levels and between the UGT2B17 copy number variant and urinary (R)-NNAL-O-Gluc levels in smokers. Cancer Epidemiol Biomarkers Prev; 25(7); 1175-84. ©2016 AACR.
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Details
- Title
- Association between Glucuronidation Genotypes and Urinary NNAL Metabolic Phenotypes in Smokers
- Creators
- Gang Chen - Department of Pharmaceutical Sciences, College of Pharmacy, Washington State University, Spokane WA 99210Shaman Luo - Alkali Soil Natural Environmental Science Center, Northeast Forestry University, Harbin, Heilongjiang, ChinaShannon Kozlovich - Department of Pharmaceutical Sciences, College of Pharmacy, Washington State University, Spokane WA 99210Philip Lazarus - Department of Pharmaceutical Sciences, College of Pharmacy, Washington State University, Spokane WA 99210
- Publication Details
- Cancer epidemiology, biomarkers & prevention, Vol.25(7), pp.1175-1184
- Academic Unit
- Pharmaceutical Sciences, Department of
- Publisher
- United States
- Grant note
- R01 ES025460 / NIEHS NIH HHS
- Identifiers
- 99900546609301842
- Language
- English
- Resource Type
- Journal article