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Related Experiment Videos

Mucosal histochemistry in secretory otitis.

T Palva, A Palva

    The Annals of Otology, Rhinology, and Laryngology
    |January 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    This study investigated enzyme activity and mucus in secretory otitis media (glue ear). Findings reveal specific enzyme localization in middle ear epithelium and mucus, offering insights into the condition's pathology.

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    Area of Science:

    • Biochemistry
    • Histology
    • Otolaryngology

    Background:

    • Secretory otitis media (glue ear) is a common condition affecting the middle ear.
    • Understanding the biochemical and cellular changes in the middle ear mucosa is crucial for diagnosing and treating this condition.

    Purpose of the Study:

    • To investigate the localization and activity of specific enzymes (acid phosphatase, lactate dehydrogenase, malate dehydrogenase, alkaline phosphatase, nonspecific esterase) within the middle ear mucosa of patients with secretory otitis media.
    • To analyze the distribution of mucosubstances (using Alcian blue and PAS staining) in the middle ear epithelium and glands.

    Main Methods:

    • Histochemical staining of mucosal biopsies from 20 ears with secretory otitis media.
    • Biochemical analysis of middle ear fluids.

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  • Comparison of histochemical findings with biochemical data.

    • Main Results:

    • High activity of acid phosphatase, lactate dehydrogenase (LD), and malate dehydrogenase (MD) was observed in the middle ear epithelium, significantly higher than in serum.
    • Alkaline phosphatase activity was found in capillaries and histiocytes, but rarely in the epithelium.
    • Nonspecific esterase was present in histiocytes and irregularly in the epithelium.
    • Alcian blue staining indicated the presence of acidic mucosubstances in epithelial cells, glands, and intercellular areas.
    • PAS staining revealed neutral mucosubstances in the columnar epithelium and surface mucus, with less intensity in glandular structures.

    Conclusions:

    • Specific enzyme activities are localized within the middle ear epithelium in secretory otitis media, suggesting their involvement in the disease process.
    • The distribution of acidic and neutral mucosubstances indicates altered secretory activity in the middle ear mucosa.
    • These histochemical findings provide valuable insights into the pathophysiology of secretory otitis media.