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Maternal hyperphenylalaninemia: an experimental model in rats

A Andersen

    Developmental Psychobiology
    |March 1, 1976
    PubMed
    Summary
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    Maternal hyperphenylalaninemia in rats reduced fetal weight and caused offspring mortality. The placenta concentrates phenylalanine, and the fetal brain is vulnerable to elevated levels, unlike the maternal brain.

    Area of Science:

    • Biomedical Research
    • Toxicology
    • Neuroscience

    Background:

    • Hyperphenylalaninemia is a metabolic disorder.
    • Maternal hyperphenylalaninemia during pregnancy poses risks to fetal development.

    Purpose of the Study:

    • To investigate the effects of experimental maternal hyperphenylalaninemia on fetal development and offspring survival in rats.
    • To examine phenylalanine levels in maternal and fetal plasma and brain tissue.

    Main Methods:

    • Inducing experimental maternal hyperphenylalaninemia in pregnant F344 rats using p-Chloro-DL-phenylalanine and L-phenylalanine.
    • Comparing fetal birth weight and offspring survival rates with saline-injected controls.
    • Measuring phenylalanine concentrations in maternal and fetal plasma and brain.

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    Main Results:

    • Experimental maternal hyperphenylalaninemia significantly reduced fetal birth weight.
    • Offspring exposed to hyperphenylalaninemia in utero exhibited mortality within 5 days post-birth.
    • Fetal plasma phenylalanine levels were substantially higher than maternal levels, indicating placental concentration.
    • Fetal brain phenylalanine levels correlated with plasma levels, while maternal brain levels remained low, suggesting differential brain protection.

    Conclusions:

    • Maternal hyperphenylalaninemia during gestation negatively impacts fetal growth and survival.
    • The placenta actively transports and concentrates phenylalanine, leading to higher fetal exposure.
    • The fetal brain is more susceptible to elevated circulating phenylalanine than the maternal brain.