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Roles for serotonin in neuroembryogenesis

J M Lauder, J A Wallace, H Krebs

    Advances in Experimental Medicine and Biology
    |January 1, 1981
    PubMed
    Summary

    Serotonin (5-HT) plays a crucial role in early embryo development, influencing neural tube formation and neuronal genesis. Evidence suggests 5-HT acts as a "differentiation signal" and may mold its own neural circuitry during neurogenesis.

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    Area of Science:

    • Developmental Biology
    • Neuroscience
    • Embryology

    Background:

    • Serotonin (5-HT) is traditionally known as a neurotransmitter.
    • Its roles during early embryonic development, particularly neuroembryogenesis, are less understood.
    • Emerging evidence suggests non-transmitter functions for 5-HT in early development.

    Purpose of the Study:

    • To investigate the non-transmitter roles of serotonin (5-HT) during early neuroembryogenesis.
    • To explore the spatio-temporal distribution and function of 5-HT in developing chick and rat embryos.
    • To understand how 5-HT influences neural tube development and neuronal genesis.

    Main Methods:

    • Fluorescence histochemistry in chick embryos to identify 5-HT uptake and synthesis sites.
    • Autoradiographic and biochemical studies in rat embryos to assess the effects of 5-HT depletion.
    • Comparative analysis of 5-HT and norepinephrine patterns during embryogenesis.

    Main Results:

    • Identified discrete sites of 5-HT uptake and synthesis in early chick embryos within the notochord, floor plate, somites, and primitive gut.
    • Observed distinct spatio-temporal patterns of 5-HT distribution during neural tube closure in chicks, differing from norepinephrine.
    • Demonstrated in rats that 5-HT depletion alters the timing of neuronal genesis in specific brain regions, suggesting a "differentiation signal" role.

    Conclusions:

    • 5-HT likely plays significant roles in neural tube development and neuronal differentiation beyond its neurotransmitter function.
    • The distinct localization patterns suggest cooperative or differential influences of 5-HT and norepinephrine on neurogenesis.
    • Maternal factors and environmental influences can potentially impact the development of monoamine circuitry during gestation.

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