Abstract
This study reports that dexamethasone (DEX) significantly induces CYP3A11, CYP3A13 and CYP3A25 mRNA expression in male and female 4 days, 3 weeks and 18 weeks old C57BL/6J mice. Furthermore, CYP3A activity, as measured by erythromycin-N-demethylation, is also significantly increased. PXR, RXRα and CAR are known to be involved in the induction of CYP3As. Here we report nuclear receptors PXR and RXRα but not CAR demonstrate gender- and age-dependent expression. Also, treatment of C57BL/6J mice with DEX induces PXR but not RXRα or CAR. In summary, we demonstrate DEX is not only able to up-regulate CYP3A expression and activity, but also the nuclear receptor PXR through which it may exert this effect. Furthermore, the gender- and age-dependent pattern of basal PXR and RXRα expression is similar to the 3 CYP3As analysed.
Original language | English |
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Pages (from-to) | 105-110 |
Number of pages | 6 |
Journal | Archives of Biochemistry and Biophysics |
Volume | 457 |
Issue number | 1 |
DOIs | |
Publication status | Published - 1 Jan 2007 |
Keywords
- CAR
- CYP3A11
- CYP3A13
- CYP3A25
- DEX
- Expression
- Induction
- Mouse
- PXR
- RXRα