Genetically mediated induction of drug-metabolizing enzymes associated with congenital defects in the mouse

Teratology
G H Lambert, D W Nebert

Abstract

Various polycyclic aromatic compounds induce certain monooxygenase activities, including aryl hydrocarbon (benzo[a]pyrene) hydroxylase (EC 1.14.14.2), and cytochrome P1-450 in the liver and many nonhepatic tissues of the mouse. This induction process is controlled by the Ah locus. Genetic differences that have been shown in the past to be associated with the Ah locus include an increased susceptibility to chemical carcinogenesis, mutagenicity in vitro, and drug toxicity--manifested as hepatic necrosis, aplastic anemia, or shortened survival time. Pregnant mice received a single injection of 3-methylcholanthrene or 7,12-dimethylbenz[a] anthracene between day 5 and day 13 of gestation, and the uterine contents were examined on day 18. Striking increases were observed in the incidence of MC-1 and DMBA-induced resorptions and congenital malformations in the aromatic hydrocarbon "responsive" C57BL/6N inbred strain, and of DMBA-induced resorptions in the "responsive" C3H/HeN and BALB/cAnN strains--when compared with the similarly treated genetically "nonresponsive" AKR/N strain. These data suggest but do not prove that an association exists between the Ah locus and developmental toxicity, i.e., teratogenesis. Although numerous terato...Continue Reading

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Related Concepts

Metabolic Process, Cellular
Chemical Burns
20-Methylcholanthrene
Necrosis
Aplastic Anemia
9,10-Dimethyl-1,2-benzanthracene
C57BL/6N Mouse
Benz(a)Anthracenes
Enzymes, antithrombotic
Congenital Neurologic Anomalies

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