Skip Navigation
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Your Environment. Your Health.

Publication Detail

Title: Cyp1a2 protects against reactive oxygen production in mouse liver microsomes.

Authors: Shertzer, Howard G; Clay, Corey D; Genter, Mary Beth; Schneider, Scott N; Nebert, Daniel W; Dalton, Timothy P

Published In Free Radic Biol Med, (2004 Mar 1)

Abstract: H(2)O(2) production was evaluated in liver microsomes prepared from Cyp1a1/1a2(+/+) wild-type and Cyp1a1(-/-) and Cyp1a2(-/-) knockout mice pretreated with 5 microg dioxin (TCDD)/kg body wt or vehicle alone. NADPH-dependent H(2)O(2) production in TCDD-induced microsomes from wild-type mice was about one-third of that in noninduced microsomes. In Cyp1a2(-/-) mice, H(2)O(2) production was the same for induced and noninduced microsomes, with levels significantly higher than those in wild-type mice. Cyp1a1(-/-) microsomes displayed markedly lower levels of H(2)O(2) production in both induced and noninduced microsomes, compared with those in wild-type and Cyp1a2(-/-) microsomes. The CYP1A2 inhibitor furafylline in vitro exacerbated microsomal H(2)O(2) production proportional to the degree of CYP1A2 inhibition, and the CYP2E1 inhibitor diethyldithiocarbamate decreased H(2)O(2) production proportional to the degree of CYP2E1 inhibition. Microsomal H(2)O(2) production was strongly correlated to NADPH-stimulated production of thiobarbituric acid-reactive substances, as well as to decreases in microsomal membrane polarization anisotropy, indicative of peroxidation of unsaturated membrane lipids. Our results suggest that possibly acting as an "electron sink," CYP1A2 might decrease CYP2E1-and CYP1A1-mediated H(2)O(2) production and oxidative stress. In this regard, CYP1A2 may be considered an antioxidant enzyme.

PubMed ID: 14980704 Exiting the NIEHS site

MeSH Terms: Animals; Cytochrome P-450 CYP1A1/metabolism*; Cytochrome P-450 CYP1A2/antagonists & inhibitors; Cytochrome P-450 CYP1A2/metabolism*; Cytochrome P-450 CYP2E1/antagonists & inhibitors; Cytochrome P-450 CYP2E1/metabolism*; Dioxins/toxicity; Ditiocarb/pharmacology; Electron Transport; Enzyme Induction/drug effects; Enzyme Inhibitors/pharmacology; Hydrogen Peroxide/metabolism*; Mice; Mice, Knockout; Microsomes, Liver/drug effects; Microsomes, Liver/enzymology*; NADP/metabolism; Oxidative Stress/physiology; Reactive Oxygen Species/metabolism*; Research Support, U.S. Gov't, P.H.S.; Theophylline/analogs & derivatives*; Theophylline/pharmacology

Back
to Top