Abstract
Human pregnancy is known to influence hepatic drug metabolism in a cytochrome (P450)-specific manner. However, the underlying mechanisms remain unknown, in part due to a lack of experimental models to study altered drug metabolism during pregnancy. In this study, we examined how pregnancy influences expression of major P450 isoforms in mice. Liver tissues were isolated from female FVB/N-mice at different gestational time points: prepregnancy, 7, 14, and 21 days of pregnancy, and 7 days postpartum. mRNA expression levels of major P450 isoforms (Cyp1a2, Cyp2a5, Cyp2b10, Cyp2c37, Cyp2d22, Cyp2e1, Cyp3a11, and Cyp3a41) in the liver tissues were determined by quantitative real-time polymerase chain reaction. Whereas Cyp2a5 expression was unchanged, Cyp3a41 expression was significantly increased during pregnancy. In contrast, expression of Cyp1a2, Cyp2c37, Cyp2d22, Cyp2e1, and Cyp3a11 was decreased. Expression of Cyp2d22 and Cyp2e1 isoforms correlated with that of peroxisome proliferator-activated receptor (PPAR)α in the mouse livers, suggesting potential involvement of PPARα in down-regulation of the P450 expression during pregnancy. Effects of pregnancy on expression of other P450 mouse isoforms as well as on in vivo drug disposition remain to be characterized. These results provide a guide for future studies on P450 regulation during pregnancy.
Footnotes
This work was supported in part by the National Institutes of Health Eunice Kennedy Shriver National Institute of Child Health and Human Development [Grant HD055313]; the National Institutes of Health Eunice Kennedy Shriver National Institute of Child Health and Human Development [Grant K12-HD055892] (fellowship to H.J.); and the National Institutes of Health National Center for Research Resources [Grant UL1-RR029879] (to H.X.).
Article, publication date, and citation information can be found at http://dmd.aspetjournals.org.
doi:10.1124/dmd.110.035790.
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ABBREVIATIONS:
- P450
- cytochrome P450
- IL
- interleukin
- TNF
- tumor necrosis factor
- IFN
- interferon
- PXR
- pregnane X receptor
- CAR
- constitutive androstane receptor
- qRT-PCR
- quantitative real-time polymerase chain reaction
- CT
- cycle threshold
- ANOVA
- analysis of variance
- PPAR
- peroxisome proliferator-activated receptor
- AhR
- Aryl hydrocarbon receptor
- ER
- estrogen receptor
- WY-14,643
- 4-chloro-6-(2,3-xylidino)-2-pyrimidinyl)thioacetic acid.
- Received August 14, 2010.
- Accepted October 22, 2010.
- Copyright © 2011 by The American Society for Pharmacology and Experimental Therapeutics
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