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Human endolymphatic sac: morphologic evidence of immunologic function.

P A Wackym, U Friberg, F H Linthicum

    The Annals of Otology, Rhinology, and Laryngology
    |May 1, 1987
    PubMed
    Summary
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    The human endolymphatic sac (ES) shows evidence of immune activity, suggesting a local immune system in the inner ear. This study explored the ES ultrastructure and leukocyte roles in immune surveillance.

    Area of Science:

    • Otolaryngology
    • Immunology
    • Cell Biology

    Background:

    • The endolymphatic sac (ES) is a crucial component of the inner ear.
    • Its potential immunologic functions in humans have not been fully elucidated.
    • Understanding the ES's role is vital for inner ear health and disease research.

    Purpose of the Study:

    • To investigate the ultrastructure of the human endolymphatic sac (ES).
    • To evaluate the potential immunologic functions of the human ES by studying its cellular components and vasculature.
    • To identify specific leukocyte subpopulations within the ES.

    Main Methods:

    • Transmission electron microscopy was used to examine ten normal human endolymphatic sacs obtained at autopsy.
    • Immunoperoxidase staining was employed on five intraosseous ES biopsies to identify leukocyte subpopulations.

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  • Morphological analysis focused on the epithelium, subepithelial space, vasculature, and leukocytes.

    • Main Results:

    • Evidence of phagocytic activity was observed, including phagocytic epithelial cells, monocytes, macrophages, and polymorphonuclear leukocytes.
    • Immune surveillance indicators such as intraepithelial and subepithelial T-lymphocytes and fenestrated blood vessels were present.
    • A homogeneously staining substance was found in ES epithelial tubules, and no B-lymphocytes were detected.

    Conclusions:

    • The findings support the existence of a local immune system within the normal human inner ear.
    • The endolymphatic sac plays a role in immune surveillance and phagocytic activity.
    • Further research into the ES's immunologic functions could impact the understanding of inner ear diseases.