Title : Quantitative prediction of CYP2B6 induction by estradiol during pregnancy: potential explanation for increased methadone clearance during pregnancy.

Pub. Date : 2013 Feb

PMID : 22815312






8 Functional Relationships(s)
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1 Quantitative prediction of CYP2B6 induction by estradiol during pregnancy: potential explanation for increased methadone clearance during pregnancy. Estradiol cytochrome P450 family 2 subfamily B member 6 Homo sapiens
2 In rodent models and in HepG2 cells, CYP2B enzymes have been shown to be regulated by estradiol. Estradiol cytochrome P450 family 2 subfamily B member 6 Homo sapiens
3 Because estradiol concentrations increase by ~50-fold during human pregnancy, it was hypothesized that the increasing estradiol concentrations during human pregnancy would result in induction of CYP2B6 activity. Estradiol cytochrome P450 family 2 subfamily B member 6 Homo sapiens
4 Because estradiol concentrations increase by ~50-fold during human pregnancy, it was hypothesized that the increasing estradiol concentrations during human pregnancy would result in induction of CYP2B6 activity. Estradiol cytochrome P450 family 2 subfamily B member 6 Homo sapiens
5 At 100 nM total estradiol, a concentration achievable during the third trimester of pregnancy, CYP2B6 activity was predicted to increase by 1.5-3-fold, based on increased CYP2B6 activity and mRNA. Estradiol cytochrome P450 family 2 subfamily B member 6 Homo sapiens
6 At 100 nM total estradiol, a concentration achievable during the third trimester of pregnancy, CYP2B6 activity was predicted to increase by 1.5-3-fold, based on increased CYP2B6 activity and mRNA. Estradiol cytochrome P450 family 2 subfamily B member 6 Homo sapiens
7 When the E(max) and EC(50) values were compared with those for carbamazepine and rifampin, estradiol was found to be as potent an inducer of CYP2B6 as rifampin and carbamazepine. Estradiol cytochrome P450 family 2 subfamily B member 6 Homo sapiens
8 These data suggest that, during human pregnancy, the increasing estradiol concentrations will result in increased clearance of drugs that have CYP2B6-mediated clearance pathways. Estradiol cytochrome P450 family 2 subfamily B member 6 Homo sapiens