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Related Experiment Videos

Transmitter phenotypic expression in the embryo.

I B Black, M C Bohn, G M Jonakait

    Ciba Foundation Symposium
    |January 1, 1981
    PubMed
    Summary
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    Early noradrenergic characters in rat embryos, marked by tyrosine hydroxylase and dopamine-beta-hydroxylase, appear transiently in gut cells. Maternal factors like glucocorticoids and nerve growth factor influence this mutable embryonic phenotypic expression.

    Area of Science:

    • Developmental Biology
    • Neuroscience
    • Embryology

    Background:

    • Noradrenergic and adrenergic phenotypes are crucial for nervous system development.
    • Understanding the temporal and regulatory aspects of their initial expression is vital.

    Purpose of the Study:

    • To investigate the initial appearance and development of noradrenergic and adrenergic phenotypes in the rat embryo.
    • To explore the factors influencing the persistence and regulation of these embryonic phenotypes.

    Main Methods:

    • Immunocytochemical methods were employed to detect specific enzymes.
    • Studies involved observing rat embryos at various gestational stages (E 11.5 to E 17.5).
    • Pharmacological interventions included reserpine, glucocorticoids, and nerve growth factor treatments.

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    Main Results:

    • Tyrosine hydroxylase and dopamine-beta-hydroxylase (noradrenergic enzymes) appeared early (E 11.5) in sympathetic ganglion primordia and gut cells, but disappeared from gut cells after E 13.5.
    • Gut cells retained noradrenaline uptake capacity despite enzyme disappearance, indicating mutable phenotypic expression.
    • Maternal treatments (reserpine, glucocorticoids) and nerve growth factor prolonged catecholamine presence in gut cells.
    • Phenylethanolamine-N-methyltransferase (PNMT), the adrenergic enzyme, appeared later (E 17.5) in adrenal primordia, with initial expression independent of glucocorticoids but subsequent development dependent on them.

    Conclusions:

    • Initial expression of noradrenergic characters in the embryonic gut is transient and mutable.
    • Maternal-embryonic interactions, particularly glucocorticoids, significantly influence embryonic phenotypic expression.
    • Adrenergic phenotype development, marked by PNMT, follows a distinct regulatory pathway compared to the noradrenergic phenotype.