title: Correlation between gene expression of aryl hydrocarbon receptor (AhR), hydrocarbon receptor nuclear translocator (Arnt), cytochromes P4501A1 (CYP1A1) and 1B1 (CYP1B1), and inducibility of CYP1A1 and CYP1B1 in human lymphocytes.
abstract: The relationships between gene expression of aryl hydrocarbon receptor (AhR), aryl hydrocarbon receptor nuclear translocator (Arnt), cytochromes P4501A1 (CYP1A1), 1B1 (CYP1B1), CYP1A1, and the inducibility of CYP1A1 and CYP1B1 were determined in 32 cultivated human lymphocytes. Cytochrome P450 induction was performed by incubating lymphocytes with benzanthracene. The relative gene expression levels were determined by quantitative real-time RT-PCR assay. We found that gender is an important confounding factor for gene expression in cultivated lymphocytes. AhR, CYP1A1 and CYP1B1 levels in noninduced lymphocytes were significantly higher in female nonsmokers than in male nonsmokers (p < 0.05). Nevertheless, CYP1A1 and CYP1B1 inducibility was lower in female nonsmokers. CYP1A1 inducibility was higher in male smokers than in male nonsmokers (p < 0.05). After controlling for gender and cigarette smoking, AhR levels positively correlated with CYP1B1 levels and CYP1A1 inducibility (p < 0.01 and p = 0.03, respectively). Arnt levels also correlated with CYP1B1 levels in induced lymphocytes (p < 0.01). However, AhR levels were negatively correlated with CYP1B1 inducibility. These data indicate that AhR expression associates with individual variation of CYP1A1 inducibility and CYP1B1 expression in cultivated lymphocytes. Furthermore, gender and cigarette smoking are important confounding factors for gene expression levels in cultivated lymphocytes.
authors.affiliation: Institute of Toxicology, Chung Shan Medical University, Taichung, Taiwan. ppl@csmu.edu.tw
authors.forename: Pinpin
authors.initials: P
authors.lastname: Lin
authors.forename: Suh-Woan
authors.initials: SW
authors.lastname: Hu
authors.forename: Tzu-Hua
authors.initials: TH
authors.lastname: Chang
mesh_terms: D000328:Adult; D001189:Aryl Hydrocarbon Hydroxylases / Q000096:biosynthesis* / Q000235:genetics*; D051784:Aryl Hydrocarbon Receptor Nuclear Translocator; D001551:Benz(a)Anthracenes / Q000633:toxicity; D002478:Cells, Cultured; D019363:Cytochrome P-450 CYP1A1 / Q000096:biosynthesis* / Q000235:genetics*; D065633:Cytochrome P-450 CYP1B1; D004268:DNA-Binding Proteins; D004790:Enzyme Induction; D005260:Female; D015971:Gene Expression Regulation, Enzymologic; D014644:Genetic Variation; D006801:Humans; D008214:Lymphocytes / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D012333:RNA, Messenger / Q000378:metabolism; D018336:Receptors, Aryl Hydrocarbon / Q000235:genetics* / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism
chemical_list: C497396:ARNT protein, human; D001551:Benz(a)Anthracenes; D004268:DNA-Binding Proteins; D012333:RNA, Messenger; D018336:Receptors, Aryl Hydrocarbon; D014157:Transcription Factors; D051784:Aryl Hydrocarbon Receptor Nuclear Translocator; C030935:benz(a)anthracene; D001189:Aryl Hydrocarbon Hydroxylases; C585496:CYP1B1 protein, human; D019363:Cytochrome P-450 CYP1A1; D065633:Cytochrome P-450 CYP1B1