7H-dibenzo[c,g]carbazole metabolism by the mouse and human CYP1 family of enzymes.

7H-dibenzo[c,g]carbazole metabolism by the mouse and human CYP1 family of enzymes. Research Abstract Details 

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7H-dibenzo[c,g]carbazole metabolism by the mouse and human CYP1 family of enzymes. Abstract Text:

Howard G Shertzer,Mary B Genter,Glenn Talaska,Christine P Curran,Daniel W Nebert,Timothy P Dalton,

Found in tobacco smoke, fossil fuel and other organic combustion products, 7H-dibenzo[c,g]carbazole (DBC) is a potent mouse lung carcinogen and potential human carcinogen. Although the first hydroxylation is critical for determining activation versus detoxication, the enzymes responsible for site-specific hydroxylation of DBC are not known. We found that DBC-DNA adduct levels are significantly higher in aromatic hydrocarbon receptor null Ahr(-/-) mice, suggesting that the induction of Aromatic hydrocarbon receptor (AHR)-regulated genes, such as those in the CYP1 family, decrease DBC genotoxicity. Using knockout mice for Cyp1a1, Cyp1a2 and Cyp1b1, we showed that the major CYP1 enzymes that metabolize DBC are CYP1A1 in beta-naphthoflavone (BNF)-induced liver, CYP1A2 in non-induced liver, CYP1B1 and CYP1A1 in induced lung and none in non-induced lung. DBC metabolism by the human CYP1 enzymes was examined in vitro using Supersomestrade mark. Each mouse CYP1, as well as each human CYP1, has a unique DBC metabolite profile. Comparison of the metabolite profile in BNF-induced mice suggested that CYP1A1 primarily generates 1-OH, 2-OH and (5 + 6)-OH-DBC, whereas CYP1A2 generates primarily (5 + 6)-OH-DBC and CYP1B1 primarily generates 4-OH-DBC. This was similar to that observed in the human CYP1 enzymes. Most importantly, lung CYP1B1 is associated with forming 4-OH-DBC, the most potent metabolite leading to DBC-DNA adducts. These studies suggest that for non-pulmonary routes of exposure (i.e. skin, gastric, i.p.), low hepatic expression of CYP1A2 and CYP1A1, together with high expression levels of lung CYP1B1 and CYP1A1, may define a phenotype for high susceptibility to carcinogens such as DBC.

7H-dibenzo[c,g]carbazole metabolism by the mouse and human CYP1 family of enzymes. Publishing Authors By Initials

HG Shertzer,MB Genter,G Talaska,CP Curran,DW Nebert,TP Dalton,

For similar enzymes and coenzymes: enzymes: oxidoreductases: nadh, nadph oxidoreductases: cytochrome reductases: nadph-ferrihemoprotein reductase research abstracts see: enzymes and coenzymes: enzymes: oxidoreductases: nadh, nadph oxidoreductases: cytochrome reductases: nadph-ferrihemoprotein reductase research

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7H-dibenzo[c,g]carbazole metabolism by the mouse and human CYP1 family of enzymes. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Carcinogenesis

VOLUME: 28

Page Numbers: 1371-8

Journal Abbreviation: Carcinogenesis

ISSN: 0143-3334

DAY: 13

MONTH: 12

YEAR: 2006

7H-dibenzo[c,g]carbazole metabolism by the mouse and human CYP1 family of enzymes. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 8008055

7H-dibenzo[c,g]carbazole metabolism by the mouse and human CYP1 family of enzymes. Keywords Mesh Terms:

KEYWORDS: NADPH-Ferrihemoprotein Reductase

MESH TERMS: physiology

Chemical & Substance for Abstract: 7H-dibenzo[c,g]carbazole metabolism by the mouse and human CYP1 family of enzymes. Information

Substance Name: NADPH-Ferrihemoprotein Reductase

Registry Number: EC 1.6.2.4

Grant and Affiliation Information for 7H-dibenzo[c,g]carbazole metabolism by the mouse and human CYP1 family of enzymes.

AFFILIATION: Department of Environmental Health and Center for Environmental Genetics, University of Cincinnati Medical Center, Cincinnati, OH 45267-0056, USA. shertzhg@ucmail.uc.edu

Country: England

AGENCY: United States NIEHS

GRANT: R01 ES12463

ACRONYM: ES

MEDLINETA: Carcinogenesis

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