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Titolo:
Oltipraz chemoprevention trial in Qidong, People's Republic of China: Results of urine genotoxicity assays as related to smoking habits
Autore:
Camoirano, A; Bagnasco, M; Bennicelli, C; Cartiglia, C; Wang, JB; Zhang, BC; Zhu, YR; Qian, GS; Egner, PA; Jacobson, LP; Kensler, TW; De Flora, S;
Indirizzi:
Univ Genoa, Dept Hlth Sci, I-16132 Genoa, Italy Univ Genoa Genoa Italy I-16132 enoa, Dept Hlth Sci, I-16132 Genoa, Italy Qidong Liver Canc Inst, Qidong 226200, Jiangsu Prov, Peoples R China Qidong Liver Canc Inst Qidong Jiangsu Prov Peoples R China 226200 R China Shanghai Canc Inst, Shanghai 200032, Peoples R China Shanghai Canc Inst Shanghai Peoples R China 200032 0032, Peoples R China Johns Hopkins Sch Hyg & Publ Hlth, Baltimore, MD 21205 USA Johns Hopkins Sch Hyg & Publ Hlth Baltimore MD USA 21205 re, MD 21205 USA
Titolo Testata:
CANCER EPIDEMIOLOGY BIOMARKERS & PREVENTION
fascicolo: 7, volume: 10, anno: 2001,
pagine: 775 - 783
SICI:
1055-9965(200107)10:7<775:OCTIQP>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
SALMONELLA-TYPHIMURIUM STRAINS; OF-CHINA; BACTERIAL MUTAGENICITY; DIETARY OLTIPRAZ; CIGARETTE-SMOKE; DNA-ADDUCTS; METABOLISM; BEEF; MODULATION; BIOMARKERS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: De Flora, S Univ Genoa, Dept Hlth Sci, Via A Pastore 1, I-16132 Genoa, Italy Univ Genoa Via A Pastore 1 Genoa Italy I-16132 2 Genoa, Italy
Citazione:
A. Camoirano et al., "Oltipraz chemoprevention trial in Qidong, People's Republic of China: Results of urine genotoxicity assays as related to smoking habits", CANC EPID B, 10(7), 2001, pp. 775-783

Abstract

A Phase II chemoprevention trial was carried out in Qidong, Jiangsu Province, People's Republic of China, The recruited subjects, all of whom were positive for serum aflatoxin-albumin adducts, were divided into three treatment arms: placebo; oltipraz ([5-(2-pyrazinyl)-3-methyl-1,2-dithiol-3-thione]) given daily at 125 mg p.o.; and oltipraz given once per week at 500 mg p.o. Besides biomarkers related to aflatoxin B-1 exposure, the genotoxicity of blind-coded urine XAD-2 concentrates was evaluated in 201 subjects on thefifth and seventh week of intervention. Genotoxicity was assessed both in the Ames reversion test in strain YG1024 of Salmonella typhimurium, in the presence of an exogenous metabolic system (S9 mix), with or without beta -glucuronidase, and in a DNA repair test in Escherichia coli, Heating of concentrated urine samples or of cigarette smoke condensates was discovered to result in a significant enhancement of their mutagenicity, It was also found that the mutagenicity of condensates from the most extensively used brands of cigarettes in Qidong was much lower than that of Western cigarette brands. Urine mutagenicity was unrelated to treatment with oltipraz, intervention time, gender, and supplement of S9 mix with beta -glucuronidase, Mutagenicity was significantly but variably higher in cigarette smokers than in nonsmokers, which suggests that the urinary excretion of mutagens in the examined population was not exclusively attributable to smoking. Nevertheless,within smokers (28% of the recruited subjects; 67% of all males), the mutagenic potency was significantly correlated with the self-reported number ofcigarettes smoked per day and, even more sharply, with the cotinine concentrations in urines. In conclusion, this study demonstrated the validity of urine mutagenicity assays as a biomarker of tobacco smoke exposure that canbe investigated on a relatively large scale in chemoprevention trials and provided evidence that oltipraz treatment had no influence on this parameter in the examined population.

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Documento generato il 02/07/20 alle ore 18:56:44