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Effect of erythromycin on otitis media with effusion in experimental rat model
F Enomoto1, G Ichikawa, I Nagaoka
1Department of Otorhinolaryngology, Juntendo University School of Medicine, Tokyo, Japan.
Abstract:
To understand the mechanism of erythromycin (EM) on otitis media with effusion, we examined its effects on leukocyte accumulation and expression of adhesion molecules L-selectin and Mac-1, using a rat experimental model Administration of EM inhibited leukocyte (neutrophil) accumulation in the middle ear cavity after LPS stimulation. Moreover, EM downregulated L-selectin expression and inhibited interleukin (IL)-8-induced upregulation of Mac-1 on peripheral blood neutrophils. These finding suggests that EM may improve otitis media with effusion by inhibiting neutrophil accumulation in the middle ear cavity through modulating the expression of adhesion molecules L-selectin and Mac-1 on peripheral blood neutrophils.
Insights
Erythromycin (EM) reduces inflammation in otitis media with effusion by decreasing neutrophil accumulation in the middle ear. It also modulates adhesion molecules L-selectin and Mac-1 expression on neutrophils.
Area of Science:
- * Otolaryngology and Pharmacology
- * Inflammation and Immunology
Background:
- * Otitis media with effusion (OME) is a common condition often associated with inflammation and fluid accumulation in the middle ear.
- * Leukocyte infiltration, particularly neutrophils, plays a crucial role in the inflammatory process of OME.
- * Adhesion molecules like L-selectin and Mac-1 are critical for leukocyte migration to inflammatory sites.
Purpose of the Study:
- * To elucidate the mechanism by which erythromycin (EM) impacts otitis media with effusion.
- * To investigate the effect of EM on leukocyte accumulation in the middle ear.
- * To examine the modulation of adhesion molecule expression (L-selectin and Mac-1) by EM.
Main Methods:
- * A rat experimental model of otitis media with effusion was utilized.
- * Leukocyte (neutrophil) accumulation in the middle ear cavity was assessed after lipopolysaccharide (LPS) stimulation.
- * Expression of adhesion molecules L-selectin and Mac-1 on peripheral blood neutrophils was analyzed, including the effect of interleukin-8 (IL-8).
Main Results:
- * Erythromycin administration significantly inhibited neutrophil accumulation in the middle ear following LPS stimulation.
- * EM treatment led to downregulation of L-selectin expression on neutrophils.
- * EM inhibited the upregulation of Mac-1 expression induced by IL-8 on peripheral blood neutrophils.
Conclusions:
- * Erythromycin demonstrates a therapeutic potential for otitis media with effusion.
- * EM appears to improve OME by reducing neutrophil infiltration into the middle ear.
- * The mechanism involves the modulation of key adhesion molecules, L-selectin and Mac-1, on neutrophils.