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Related Experiment Videos

Hepatocyte innervation in primates.

W G Forssmann, S Ito

    The Journal of Cell Biology
    |July 1, 1977
    PubMed
    Summary

    This study reveals that tree shrew liver lobules possess efferent adrenergic nerve fibers that directly interact with hepatocytes. These nerves, identified using microscopy and autoradiography, degenerate after chemical sympathectomy but show signs of regeneration.

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    Area of Science:

    • Hepatology
    • Neuroscience
    • Primate Anatomy

    Background:

    • The liver's complex functions are influenced by neural regulation.
    • Understanding the specific innervation patterns in primate models is crucial for comparative physiology.

    Purpose of the Study:

    • To describe the efferent innervation of the liver lobule in the tree shrew.
    • To characterize the nerve fibers and their relationship with liver cells.

    Main Methods:

    • Transmission electron microscopy (TEM) to visualize nerve endings.
    • Fluorescence microscopy to map adrenergic nerve distribution.
    • Autoradiography using [3H]norepinephrine to assess neurotransmitter uptake.
    • Chemical sympathectomy with 6-OH-dopamine to study nerve degeneration and regeneration.

    Main Results:

    • Efferent adrenergic nerve endings were consistently found in close apposition to hepatocytes, particularly near triads and in the space of Disse.
    • Autoradiography confirmed that intralobular nerves are capable of norepinephrine uptake, indicating an adrenergic nature.
    • Chemical sympathectomy led to the degeneration of all intralobular nerve fibers, with partial regeneration observed between 60-90 days.
    • Nerves also showed associations with von Kupffer cells and endothelial cells.

    Conclusions:

    • The tree shrew liver exhibits significant efferent adrenergic innervation of hepatocytes.
    • These findings provide insights into the neural control mechanisms of liver function in primates.
    • Further research is needed to fully elucidate the functional implications of this innervation.

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