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Related Experiment Videos

Lysosomal thiol proteases in middle ear effusions.

Y Hamaguchi, K Sakakura, Y Majima

    The Annals of Otology, Rhinology & Laryngology. Supplement
    |May 1, 1986
    PubMed
    Summary

    Lysosomal cathepsins B and H show higher activity in middle ear effusions (MEEs) than plasma. Cathepsin B in mucoid MEEs may drive chronic otitis media inflammation.

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    Area of Science:

    • Biochemistry
    • Immunology
    • Otolaryngology

    Background:

    • Chronic otitis media with effusion (OME) involves persistent middle ear inflammation.
    • Proteolytic enzymes in middle ear effusions (MEEs) may contribute to OME pathogenesis.
    • Lysosomal enzymes, particularly cathepsins, are implicated in inflammatory processes.

    Purpose of the Study:

    • To compare the hydrolytic activity of cathepsins B and H, and trypsin-like proteases in MEEs and plasma.
    • To investigate differences in protease activity between serous and mucoid MEEs.
    • To elucidate the role of specific proteases in the inflammatory mechanisms of chronic OME.

    Main Methods:

    • Measurement of hydrolytic activity of cathepsins B and H, and trypsin-like proteases.
    • Analysis of 115 middle ear effusions (MEEs) from chronic OME patients (40 serous, 75 mucoid).
    • Comparison of MEE protease activity with plasma samples and assessment using inhibitor profiles.

    Main Results:

    • Significantly higher cathepsin B and H activity in MEEs compared to plasma (p < 0.01).
    • Elevated cathepsin B activity in mucoid MEEs versus serous MEEs (p < 0.01).
    • Weak trypsin-like protease activity in both MEEs and plasma; distinct protease profiles between MEEs and plasma.

    Conclusions:

    • Lysosomal thiol proteases, especially cathepsin B from macrophages, are significantly elevated in MEEs.
    • Cathepsin B activity in mucoid MEEs suggests a key role in perpetuating OME inflammation.
    • These findings highlight cathepsin B as a potential therapeutic target in chronic OME.

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