The relationship between aryl hydrocarbon hydroxylase and polymorphisms of the CYP1A1 gene

Japanese Journal of Cancer Research : Gann
C KiyoharaS Inutsuka

Abstract

We examined the relationship between aryl hydrocarbon hydroxylase (AHH) and the frequency of a MspI mutation in the 3'-flanking region of cytochrome P450 (CYP) 1A1 (MspI polymorphism) and another mutation in exon 7 (Ile-Val polymorphism) in 84 healthy male subjects in Fukuoka, Japan. AHH inducibility (3-methylcholanthrene (MC)-induced AHH activity/non-induced AHH activity) was correlated with the MspI polymorphism (P < 0.0001) and age class (P = 0.015), whereas no correlation was found for the Ile-Val polymorphism (P = 0.509). Age-adjusted AHH inducibility (mean +/- SE) of the predominant homozygote (genotype A), the heterozygote (genotype B) and a homozygote rare allele (genotype C) genotypes was 4.89 +/- 0.36, 4.82 +/- 0.29 and 13.61 +/- 1.44, respectively. The genotype C showed much higher AHH inducibility than genotypes A and B (P < 0.001), while no significant difference was observed between genotypes A and B. Non-induced AHH activity was also correlated with these polymorphisms. The AHH activity of a homozygous mutant Val/Val genotype (0.076 +/- 0.010 pmol/min/10(6) cells) was significantly higher (P < 0.05) than that of the wild-type homozygous Ile/Ile (0.044 +/- 0.004 pmol/min/10(6) cells) and heterozygous Ile/Val (0.04...Continue Reading

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