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Monoamine oxidase type A: differences in selectivity towards l-norepinephrine compared to serotonin

N A Garrick, D L Murphy

    Biochemical Pharmacology
    |December 15, 1982
    PubMed
    Summary

    Monoamine oxidase A (MAO-A) preferentially metabolizes serotonin over l-norepinephrine. However, MAO-B in human platelets also metabolizes l-norepinephrine, suggesting roles for both MAO types in norepinephrine breakdown.

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    Area of Science:

    • Neuroscience
    • Biochemistry
    • Pharmacology

    Background:

    • Monoamine oxidase (MAO) enzymes are crucial for neurotransmitter metabolism.
    • MAO-A is traditionally considered the primary enzyme for metabolizing serotonin and l-norepinephrine.

    Purpose of the Study:

    • To comparatively examine the substrate selectivity of MAO-A and MAO-B for l-norepinephrine and serotonin across different species.
    • To investigate the differential inhibition of MAO by clorgyline.

    Main Methods:

    • Comparative analysis of MAO activity in various tissues from different species.
    • Enzyme kinetic studies measuring apparent Km and deamination rates.
    • Assessment of inhibition by clorgyline, a selective MAO-A inhibitor.

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    Main Results:

    • Serotonin is a more selective substrate for MAO-A than l-norepinephrine, with greater differences observed in primates compared to rodents.
    • MAO-A exhibits a lower Km and higher deamination rate for serotonin versus l-norepinephrine.
    • MAO-B in human platelets demonstrates a higher deamination rate for l-norepinephrine than serotonin.

    Conclusions:

    • l-Norepinephrine is a substrate for both MAO-A and MAO-B in vitro, unlike serotonin which is primarily metabolized by MAO-A.
    • The significant role of MAO-B in primate norepinephrine degradation warrants consideration in studies involving MAO inhibitors like clorgyline.