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Alteration of effective exposure of dam and embryo to caffeine and its metabolites by treatment of mice with beta-naphthoflavone.

Authors :
York RG
O'Flaherty EJ
Scott WJ Jr
Shukla R
Source :
Toxicology and applied pharmacology [Toxicol Appl Pharmacol] 1987 Apr; Vol. 88 (2), pp. 282-93.
Publication Year :
1987

Abstract

The effect of treatment of pregnant C57BL/6J (B6) and AKR/J (AKR) mice with the cytochrome P-450 inducing agent beta-naphthoflavone (beta NF) on caffeine metabolism and on exposure of dam and embryo to caffeine and to its metabolites theophylline (TP), theobromine (TB), paraxanthine (PX), and trimethyluric acid (TMUA) was investigated. Treated dams were given either 20 or 80 mg beta NF/kg ip on Days 9 and 10 of gestation. Caffeine, 175 mg/kg, was given ip on Days 11 and 12 of gestation. Concentrations of caffeine and its metabolites were monitored in maternal plasma and in embryo homogenates at 0.083, 0.25, 0.5, 1, 2, 4, and 6 hr after the second caffeine injection. Effective exposure was expressed as the area under the concentration-time curve from 0 to 6 hr. Caffeine loss in B6 mice was best described by an expression incorporating capacity-limited kinetics. Pretreatment induced formation of TB and PX, while it induced elimination of all three of the monodemethylated metabolites, in B6 mice. Consequently, pretreatment caused marked reductions in exposure of B6 dams and embryos to both caffeine and TP. Exposure to TB and PX was less consistently affected, although it was reduced by pretreatment with 80 mg beta NF/kg. In contrast, exposure of AKR dams and embryos to caffeine and its metabolites was only slightly affected by beta NF pretreatment. The prevalence of paw malformations in the offspring of treated mice correlated well with effective exposure to both caffeine and TP, but not at all with the administered caffeine dose.

Details

Language :
English
ISSN :
0041-008X
Volume :
88
Issue :
2
Database :
MEDLINE
Journal :
Toxicology and applied pharmacology
Publication Type :
Academic Journal
Accession number :
3564044
Full Text :
https://doi.org/10.1016/0041-008x(87)90013-5