Document Detail

Effects of cruciferous vegetable consumption on urinary metabolites of the tobacco-specific lung carcinogen 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone in singapore chinese.
MedLine Citation:
PMID:  15184256     Owner:  NLM     Status:  MEDLINE    
Vegetable consumption, including cruciferous vegetables, is protective against lung cancer, but the mechanisms are poorly understood. The purpose of this study was to investigate the effects of cruciferous vegetable consumption on the metabolism of the tobacco-specific lung carcinogen 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) in smokers. The study was carried out in Singapore Chinese, whose mean daily intake of cruciferous vegetables is three times greater than that of people in the United States. Eighty-four smokers provided urine samples and were interviewed about dietary habits using a structured questionnaire, which included questions on consumption of nine commonly consumed cruciferous vegetables. Samples of these vegetables obtained in Singapore markets at three different times of year were analyzed for glucosinolates. Urine was analyzed for metabolites of NNK: 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol (NNAL) and its glucuronides (NNAL-Glucs). Glucobrassicins, which release indole-3-carbinols on chewing, were the major glucosinolates in seven of the nine cruciferous vegetables, accounting for 70.0% to 93.2% of all glucosinolates in these vegetables. There was a significant correlation (P = 0.01) between increased consumption of glucobrassicins and decreased levels of NNAL in urine after adjustment for number of cigarettes smoked per day; similar trends were observed for NNAL-Glucs (P = 0.08) and NNAL plus NNAL-Glucs (P = 0.03). These results are consistent with those of previous studies, which demonstrate that indole-3-carbinol decreases levels of urinary NNAL probably by inducing hepatic metabolism of NNK. The results are discussed with respect to the known chemopreventive activity of indole-3-carbinol against lung tumorigenesis by NNK in mice and the effects of isothiocyanates, which are also formed on consumption of cruciferous vegetables, on NNK metabolism. The results of this study demonstrate the complexities in assessing effects of cruciferous vegetables on carcinogen metabolism.
Stephen S Hecht; Steven G Carmella; Patrick M J Kenney; Siew-Hong Low; Kazuko Arakawa; Mimi C Yu
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Cancer epidemiology, biomarkers & prevention : a publication of the American Association for Cancer Research, cosponsored by the American Society of Preventive Oncology     Volume:  13     ISSN:  1055-9965     ISO Abbreviation:  Cancer Epidemiol. Biomarkers Prev.     Publication Date:  2004 Jun 
Date Detail:
Created Date:  2004-06-08     Completed Date:  2004-09-03     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  9200608     Medline TA:  Cancer Epidemiol Biomarkers Prev     Country:  United States    
Other Details:
Languages:  eng     Pagination:  997-1004     Citation Subset:  IM    
University of Minnesota Cancer Center, Mayo Mail Code 806, 420 Delaware St. SE, Minneapolis, MN 55455, USA.
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MeSH Terms
Anticarcinogenic Agents / urine
Carcinogens / metabolism*
China / ethnology
Glucosinolates / chemistry,  urine*
Glucuronides / urine
Lung Neoplasms / prevention & control
Middle Aged
Nitrosamines / urine*
Prospective Studies
Smoking / urine*
Tobacco / metabolism
Vegetables / chemistry,  classification,  metabolism*
Grant Support
Reg. No./Substance:
0/Anticarcinogenic Agents; 0/Carcinogens; 0/Glucosinolates; 0/Glucuronides; 0/Indoles; 0/Nitrosamines; 64091-91-4/4-(N-methyl-N-nitrosamino)-1-(3-pyridyl)-1-butanone; 700-06-1/indole-3-carbinol

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