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Prenatal diazepam: distribution and metabolism in perinatal rats

R D Simmons, R K Miller, C K Kellogg

    Teratology
    |October 1, 1983
    PubMed

    Insights

    Prenatal diazepam (DZ) exposure affects neonatal brain development. This study tracked DZ metabolism in rat pups, finding it persists in the brain longer than in the dam, with distinct metabolic profiles in neonates.

    Area of Science:

    • Neuroscience
    • Developmental Biology
    • Pharmacology

    Background:

    • Prenatal exposure to diazepam (DZ) is known to alter offspring brain development and behavior in rodents.
    • Understanding the metabolic fate of DZ in neonates is crucial for comprehending its effects on the developing nervous system.

    Purpose of the Study:

    • To investigate the disposition, metabolism, and persistence of diazepam (DZ) in neonates following prenatal exposure.
    • To compare the metabolic profile of DZ in neonates with that of the dam.

    Main Methods:

    • Pregnant rats were injected with 14C-labeled diazepam (DZ) during gestation (days 13-20).
    • Litters were fostered at birth, and dams and neonates were analyzed for 14C activity at various time points (postpartum day 0, 10, and 20).
    • Brain levels of DZ and its metabolites (oxazepam, N-desmethyldiazepam, glucuronide) were quantified using high-performance liquid chromatography (HPLC).

    Main Results:

    • 14C activity was detected in neonate brains at postnatal days 0 and 10, but was undetectable by day 20.
    • Neonatal peripheral tissue 14C activity was undetectable by day 10.
    • The brain regional analysis showed highest 14C concentration in the colliculi at day 0.
    • Metabolite profiles differed between dams and neonates, with neonates at day 10 showing a higher proportion of N-desmethyldiazepam and oxazepam compared to dams.

    Conclusions:

    • Prenatal diazepam exposure leads to its persistence in the neonatal brain, with a distinct metabolic profile compared to the dam.
    • The observed differences in distribution and metabolism suggest a unique impact of prenatal DZ exposure on the developing nervous system.

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