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Multiple forms of monoamine oxidase in developing chick brain

O Suzuki, Y Katsumata, M Oya

    Developmental Neuroscience
    |January 1, 1978
    PubMed
    Summary
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    Chick brain development shows a changing ratio of monoamine oxidase (MAO) A to MAO B forms. This developmental pattern differs from that observed in other mammals, challenging existing theories about immature brain MAO activity.

    Area of Science:

    • Neuroscience
    • Biochemistry
    • Developmental Biology

    Background:

    • Monoamine oxidase (MAO) enzymes play crucial roles in neurotransmitter metabolism.
    • Understanding the developmental changes in MAO isoforms is vital for comprehending brain maturation.

    Purpose of the Study:

    • To investigate the developmental changes in monoamine oxidase (MAO) forms within the chick brain.
    • To analyze substrate specificity and inhibitor sensitivity of MAO during development.

    Main Methods:

    • Enzyme activity assays using specific substrates like beta-phenylethylamine and 5-hydroxytryptamine.
    • Inhibitor sensitivity studies to differentiate between MAO A and MAO B forms.

    Main Results:

    • MAO activity patterns towards beta-phenylethylamine and 5-hydroxytryptamine showed similar developmental trends.

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  • The ratio of MAO A to MAO B significantly increased during chick brain development.

    • Conclusions:

    • The developmental trajectory of MAO A/B ratio in chick brains is distinct from that in rodents and humans.
    • Findings do not support the hypothesis that MAO A predominates in immature mammalian brains.