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SRS-A leukotrienes decrease the activity of human respiratory cilia.

H Bisgaard, M Pedersen

    Clinical Allergy
    |March 1, 1987
    PubMed
    Summary
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    Leukotrienes C4 and D4 significantly decrease human nasal ciliary beat frequency in a dose-dependent manner. This effect is specific to SRS-A leukotrienes and blocked by their receptor antagonist.

    Area of Science:

    • Respiratory Cell Biology
    • Immunopharmacology
    • Cilia and Motility

    Background:

    • The slow reacting substance of anaphylaxis (SRS-A) comprises leukotrienes (LT) C4 and D4, known mediators in allergic responses.
    • Ciliary activity in the human respiratory tract is crucial for mucociliary clearance and defense.
    • The specific impact of SRS-A constituents on human respiratory cilia requires detailed investigation.

    Purpose of the Study:

    • To investigate the effects of leukotrienes C4 (LTC4) and D4 (LTD4) on the ciliary beat frequency of human nasal cells.
    • To determine the dose-dependency and structural specificity of SRS-A leukotrienes on ciliary function.
    • To compare the effects of SRS-A leukotrienes with other related molecules like LTB4 and histamine.

    Main Methods:

    • Human nasal cells were obtained via cell scraping from the inferior turbinate.

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  • Ciliary beat frequency was measured using a microphoto-oscillographic technique in a blind study design.
  • Cells were exposed to varying concentrations of LTC4, LTD4, LTB4, and histamine, with simultaneous perfusion using control solutions and SRS-A receptor antagonist FPL 55712.

    • Main Results:

    • LTC4 induced a significant, dose-related decrease in ciliary beat frequency (up to ~20%) compared to controls.
    • The inhibitory effect of LTC4 was significantly blocked by the SRS-A receptor antagonist FPL 55712.
    • LTD4 also decreased ciliary beat frequency, while LTB4 and histamine showed no significant effect, indicating structural specificity.

    Conclusions:

    • SRS-A leukotrienes (LTC4 and LTD4) negatively impact human respiratory ciliary activity.
    • The observed effects are specific to the sulphidopeptide-containing SRS-A leukotrienes, suggesting a defined receptor-mediated mechanism.
    • These findings highlight the potential role of SRS-A leukotrienes in respiratory conditions affecting mucociliary clearance.