The effect of pregnancy on the metabolism of [14C]phenytoin in the isolated perfused rat liver.
The metabolism of [14C]phenytoin (DPH) was measured in isolated perfused livers from non-pregnant female rats and rats at 13, 15, 17, 19 and 21 days of gestation. The half-life of [14C]phenytoin in the perfusate was not significantly altered by pregnancy in livers perfused with 20% blood at 2 ml/min/g of liver but was increased from 38 min in control livers to 158 min in livers from rats at 21 days of gestation when livers were perfused with 10% blood at 1 ml/min/g of liver. Secretion of the glucuronide conjugate of 5-[14C]phenyl-5-parahydroxy-phenylhydantoin into the bile was markedly inhibited during the latter stages of pregnancy such that a 4-fold decrease in the cumulative secretion into the bile was present at 21 days of gestation. The bile/perfusate concentration ratio of the glucuronide after 30 min was 148 in control livers but decreased to 6 in livers from rats at 21 days gestation.
D000818:Animals; D001646:Bile / Q000502:physiology; D005260:Female; D005965:Glucuronates / Q000378:metabolism; D006207:Half-Life; D006900:Hydroxylation; D066298:In Vitro Techniques; D008099:Liver / Q000378:metabolism*; D009929:Organ Size; D010101:Oxygen Consumption; D010672:Phenytoin / Q000378:metabolism*; D011247:Pregnancy; D011270:Pregnancy, Animal; D051381:Rats; D013997:Time Factors
D005965:Glucuronates; D010672:Phenytoin