Aryl hydrocarbon receptor-mediated Cyp1a1 expression is modulated in a CLOCK-dependent circadian manner

Naomi Tanimura, Naoki Kusunose, Matsunaga Naoya, Koyanagi Satoru, Shigehiro Ohdo

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The expression of genes involved in xenobiotic detoxification is under the control of the circadian clock. The aryl hydrocarbon receptor (AhR) is one of the transcription factors responsible for the induction of detoxification enzymes in response to xenobiotic toxins, and the expression of AhR has been suggested to be regulated by a circadian oscillator. In this study, we investigated whether toxin-mediated activation of the AhR signaling pathway was modulated by CLOCK protein, a key component of the mammalian circadian clock. The expression of AhR and its DNA binding ability in the lungs of wild-type mice showed significant 24-h oscillation. . Clock mutant (. Clk/Clk) mice, producing CLOCK protein deficient in transcriptional activity, failed to show significant oscillation in the expression of AhR. The mRNA levels of . AhR in the lungs of . Clk/Clk mice were significantly lower than in wild-type mice. A single intraperitoneal injection of benzo[α]pyrene, a ligand of AhR, induced the expression of . Cyp1a1 in the lungs of wild-type mice, but the induction varied depending on the benzo[α]pyrene injection time. The dosing time-dependency of benzo[α]pyrene-induced . Cyp1a1 expression was also modulated by . Clock gene mutation. These findings suggest that CLOCK protein affects the toxin-induced expression of detoxification enzymes through modulating the activity of AhR. Our present findings provide a molecular link between the circadian clock and xenobiotic detoxification.

Original languageEnglish
Pages (from-to)203-207
Number of pages5
JournalToxicology
Volume290
Issue number2-3
DOIs
Publication statusPublished - Dec 18 2011

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Aryl Hydrocarbon Receptors
CLOCK Proteins
Detoxification
Clocks
Circadian Clocks
Xenobiotics
Lung
Genes
Enzyme Induction
Benzo(a)pyrene
Enzymes
Intraperitoneal Injections
Transcription Factors
Chemical activation
Ligands
Gene Expression
Messenger RNA
Mutation
Injections
DNA

All Science Journal Classification (ASJC) codes

  • Toxicology

Cite this

Aryl hydrocarbon receptor-mediated Cyp1a1 expression is modulated in a CLOCK-dependent circadian manner. / Tanimura, Naomi; Kusunose, Naoki; Naoya, Matsunaga; Satoru, Koyanagi; Ohdo, Shigehiro.

In: Toxicology, Vol. 290, No. 2-3, 18.12.2011, p. 203-207.

Research output: Contribution to journalArticle

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