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Related Experiment Videos

Middle ear pathologic changes associated with chronic anaerobic sinusitis in rabbits.

C A Kennedy1, H Jyonouchi, K C Kajander

  • 1Department of Otolaryngology, University of Minnesota, Minneapolis 55445, USA.

The Laryngoscope
|March 25, 1999
PubMed
Summary

This study developed a rabbit model for chronic sinusitis, revealing that middle ear immune responses occur bilaterally, even without direct bacterial spread. This research offers insights into sinusitis-related ear infections and immune reactions.

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Area of Science:

  • Otolaryngology
  • Immunology
  • Microbiology

Background:

  • Chronic sinusitis can lead to secondary infections and inflammatory responses in adjacent structures.
  • Understanding the immune mechanisms in the middle ear during sinusitis is crucial for effective treatment.

Purpose of the Study:

  • To investigate histopathologic changes and immune responses in the middle ear of rabbits with experimentally induced unilateral chronic anaerobic sinusitis.
  • To establish a reliable animal model for studying sinusitis-induced otitis.

Main Methods:

  • Unilateral chronic sinusitis was induced in New Zealand white rabbits using Bacteroides fragilis.
  • Bilateral middle ear and sinus tissues were analyzed for histopathology, immunoglobulin G (IgG) antibody levels, lactate dehydrogenase (LDH), and interferon gamma (IFN-γ) mRNA expression.

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  • Bacterial cultures and lavages were performed at multiple time points.

    • Main Results:

    • Bacteroides fragilis dissemination to the contralateral sinus and middle ears occurred in some rabbits, but histopathologic changes were less severe than in the infected sinus.
    • Bilateral immune responses, including elevated IgG antibodies and IFN-γ mRNA, were detected in the sinuses and middle ears, independent of bacterial spread.
    • LDH levels correlated with bacterial growth and inflammation severity.

    Conclusions:

    • The developed rabbit model effectively simulates unilateral chronic sinusitis and associated middle ear responses.
    • Results demonstrate bilateral mucosal immune activation in the middle ear secondary to sinusitis, irrespective of direct bacterial translocation.