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The influence of leukotrienes and platelet activating factor on mucociliary activity in the rabbit maxillary sinus
J Dolata1, S Lindberg, U Mercke
1Department of Oto-Rhono-Laryngology, University Hospital, Lund, Sweden.
Abstract:
Inflammatory mediators released in the airways during allergic reactions can affect the mucociliary system. Leukotrienes and platelet activating factor have been shown to affect the mucociliary activity in various cell preparations. The in vivo effects of these inflammatory mediators on mucociliary activity in rabbit maxillary sinus were investigated using a photoelectric technique. Leukotrienes C4 and D4 in the dose range 0.01-10.0 nmol/kg did not alter mucociliary activity significantly, either when given as bolus injections or as intraarterial infusions. Platelet activating factor had no effect in the dose range 0.001-0.1 nmol/kg. A dose of 1.0 nmol/kg increased mucociliary activity by 20.2 +/- 5.5% but produced adverse respiratory and circulatory effects at the same time. It is concluded that the inflammatory mediators leukotrienes C4, D4 and platelet activating factor have no essential regulatory influence on mucociliary activity in the upper airways of the rabbit.
Insights
This study investigated the impact of inflammatory mediators on mucociliary activity in rabbits. Leukotrienes C4, D4, and platelet-activating factor did not significantly affect mucociliary function in the upper airways.
Area of Science:
- Respiratory Medicine
- Immunology
- Pharmacology
Background:
- Allergic reactions release inflammatory mediators affecting airway mucociliary system.
- Leukotrienes and platelet-activating factor (PAF) are implicated in mucociliary dysfunction.
- In vivo data on these mediators' effects on upper airway mucociliary activity are limited.
Purpose of the Study:
- To investigate the in vivo effects of leukotrienes C4, D4, and PAF on mucociliary activity in rabbit maxillary sinus.
- To determine the dose-response relationship and potential regulatory influence of these mediators.
Main Methods:
- Utilized a photoelectric technique to measure mucociliary activity in rabbit maxillary sinus.
- Administered leukotrienes C4, D4, and PAF via bolus injections and intraarterial infusions.
- Observed effects across various dose ranges (0.01-10.0 nmol/kg for leukotrienes, 0.001-1.0 nmol/kg for PAF).
Main Results:
- Leukotrienes C4 and D4 (0.01-10.0 nmol/kg) showed no significant alteration in mucociliary activity.
- PAF (0.001-0.1 nmol/kg) had no discernible effect on mucociliary activity.
- A high dose of PAF (1.0 nmol/kg) increased activity by 20.2% but caused adverse systemic effects.
Conclusions:
- Leukotrienes C4, D4, and PAF do not appear to have a significant regulatory role in rabbit upper airway mucociliary activity.
- The observed effects at high PAF doses suggest potential systemic toxicity rather than direct mucociliary regulation.