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Titolo:
Plasma caffeine metabolite ratio (17X/137X) in vivo associated with G-2964A and C734A polymorphisms of human CYP1A2
Autore:
Han, XM; Ou-Yang, DS; Lu, PX; Jiang, CH; Shu, Y; Chen, XP; Tan, ZR; Zhou, HH;
Indirizzi:
Hunan Med Univ, Pharmacogenet Res Inst, Changsha 410078, Peoples R China Hunan Med Univ Changsha Peoples R China 410078 a 410078, Peoples R China Qidong Liver Canc Inst, Qidong, Peoples R China Qidong Liver Canc Inst Qidong Peoples R China , Qidong, Peoples R China
Titolo Testata:
PHARMACOGENETICS
fascicolo: 5, volume: 11, anno: 2001,
pagine: 429 - 435
SICI:
0960-314X(200107)11:5<429:PCMR(I>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN LIVER; GENETIC POLYMORPHISMS; 5'-FLANKING REGION; XANTHINE-OXIDASE; ENZYME-INDUCTION; O-DEETHYLATION; CYTOCHROME-P450; 1A2; CARCINOGENS; MICROSOMES;
Keywords:
CYP1A2; 17X/137X; phenotype; genotype; polymorphism;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Zhou, HH Hunan Med Univ, Pharmacogenet Res Inst, Changsha 410078, Peoples R China Hunan Med Univ Changsha Peoples R China 410078 Peoples R China
Citazione:
X.M. Han et al., "Plasma caffeine metabolite ratio (17X/137X) in vivo associated with G-2964A and C734A polymorphisms of human CYP1A2", PHARMACOGEN, 11(5), 2001, pp. 429-435

Abstract

Either G-2964 or A734 in the human CYP1A2 gene was confirmed to be associated with high inducible enzyme activity in smokers, but not in nonsmokers. In this study, for the first time, we observed an association between phenotypes and genotypes of CYP1A2 with respect to the two genetic polymorphismsin 163 healthy Chinese volunteers living in Qidong. The ratio of plasma 17X/137X at 6 h after oral administration of 300 mg caffeine was employed in CYP1A2 phenotyping analysis, while genotyping analysis was carried out by polymerase chain reaction-restriction fragment length polymorphism. The allele frequencies of A at -2964 and A at 734 in 139 non-smelting subjects were0.25 and 0.67, respectively. The A/ A(-2964)C/C-734, G/A(-2964)C/C-734 Or A/A(-2964)C/A(734) genotype that was thought to have lower inducibility/activity of CYP1A2 than the other genotypes did not exist in the tested Chinese subjects, The ratio of 17X/137X was 0.46 +/- 0.26 in G/G(-2964)A/A(734) genotypes (n = 22) and 0.36 +/- 0.19 in non-G/G(-2964)A/A(734) (n =117), In addition, there was significant difference between them (P = 0.036). A similar result was also achieved in 24 smelters. Since Qidong is a special region with particularly high incidence of hepatocellular carcinoma in China, the association of phenotypes with genotypes of CYP1A2 in the Qidong population might result from some inducible environmental factors such as those ofcigarettes in smokers. Pharmacogenetics 11: 129-435 (C) 2001 Lippincott Williams & Wilkins.

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Documento generato il 04/04/20 alle ore 02:56:19