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Glucocorticoid regulation of synaptic development.

D G Puro

    Brain Research
    |June 1, 1983
    PubMed
    Summary

    Glucocorticoid hormones accelerate the maturation of cholinergic retinal neurons, enabling stimulus-evoked neurotransmitter release. This hormonal regulation of synaptic development occurs at physiological levels and can be influenced in utero.

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    Area of Science:

    • Neuroscience
    • Developmental Biology
    • Endocrinology

    Background:

    • Synaptic transmission development is crucial for neural circuit formation.
    • Cholinergic neurons from the rat retina mature in culture, progressing through spontaneous and evoked release stages.
    • Understanding factors influencing synaptic maturation is key to developmental neuroscience.

    Purpose of the Study:

    • To investigate the role of glucocorticoid hormones in the maturation of cholinergic synapses.
    • To determine if glucocorticoids influence the developmental timing of neurotransmitter release.
    • To explore the mechanisms and in vivo relevance of glucocorticoid action on synaptic development.

    Main Methods:

    • Utilized a rat retina-striated muscle cell co-culture system.
    • Assessed neurotransmitter release (acetylcholine) before and after glucocorticoid exposure.
    • Investigated the involvement of glucocorticoid receptors, transcriptional regulation, and protein synthesis.
    • Administered glucocorticoids to pregnant rats to assess in utero effects.

    Main Results:

    • Glucocorticoid hormones significantly accelerated the emergence of stimulus-evoked acetylcholine release.
    • The effect was observed at physiological hormone concentrations and required functional glucocorticoid receptors, transcription, and protein synthesis.
    • In utero exposure to glucocorticoids or stress also hastened synaptic maturation in retinal neurons.

    Conclusions:

    • Glucocorticoid hormones act as potent regulators of cholinergic synapse maturation timing.
    • These hormones likely modulate the molecular machinery linking neuronal activity to neurotransmitter release.
    • Synaptic development timing is sensitive to hormonal and stress influences during critical developmental periods, both in vitro and in vivo.

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