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Cell culture as models for studying neural functions.

B Hamprecht

    Progress in Neuro-Psychopharmacology & Biological Psychiatry
    |January 1, 1984
    PubMed
    Summary

    This study explores how hormones regulate cyclic AMP in neural cell cultures. Opioids inhibit hybrid cells, aiding research into their mechanisms, while various peptides and neurotransmitters affect glial cells.

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    Area of Science:

    • Neuroscience
    • Cell Biology
    • Pharmacology

    Background:

    • Two in vitro cell culture systems, a neuronal hybrid cell line and primary glial-rich cultures, were utilized.
    • These systems are crucial for studying neural functions and the mechanisms of hormone action within the nervous system.

    Purpose of the Study:

    • To investigate the regulation of cyclic AMP levels by various hormones in neuronal and glial cell cultures.
    • To elucidate the mechanisms of opioid action on neuronal hybrid cells.
    • To explore the role of specific peptides and neurotransmitters in modulating cyclic AMP and other cellular responses in glial cells.

    Main Methods:

    • Utilized neuroblastoma x glioma hybrid cells and primary glial-rich cultures from newborn murine brains.
    • Measured cyclic AMP levels in response to various hormonal stimuli.
    • Assessed changes in cell membrane permeability and ion transport (Na+, guanidinium).
    • Investigated the transport of taurine across the plasma membrane.

    Main Results:

    • Opioids were found to inhibit cyclic AMP formation in hybrid cells.
    • Gastrointestinal peptides (secretin, vasoactive intestinal peptide), calcemic hormones (parathyrin, calcitonin), adrenocorticotropin, melanotropins, and somatostatin modulated cyclic AMP in glial cultures.
    • Noradrenaline and adenosine differentially regulated cyclic AMP synthesis in glial cells via adrenergic and adenosine receptors.
    • Bradykinin induced slow hyperpolarization and cyclic GMP formation in hybrid cells, with rapid desensitization.
    • Substance P increased Na+ permeability in hybrid cells.
    • Hybrid cells demonstrated specific, Na+-dependent taurine uptake, supporting the 'pumped station' hypothesis for sodium elimination.

    Conclusions:

    • Hormonal regulation of cyclic AMP is a key feature in both neuronal hybrid and glial cell systems.
    • These cell culture models provide valuable tools for understanding opioid action and neurochemical signaling pathways.
    • Taurine transport is a critical Na+-dependent process potentially involved in neuronal activity regulation.

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