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Scanning electron microscopy and immunoglobulins of the endolymphatic sac in Menière's disease
H Kumagami1, S Nakajima, K Mizukoshi
1Department of Otolaryngology, Nagasaki University, Japan.
Abstract:
SEM and immunoglobulin staining of the intradural portion of the endolymphatic sac (ES) were investigated. All 15 normal subjects, from fetuses to an 80-year-old adult, showed well arranged epithelial cells. In Menière's disease (all 15 patients) the ES showed various types degeneration of the epithelial cells. Inner ear deafness experimentally produced by kanamycin injection showed a similar degeneration of the ES. IgG of the ES in Menière's disease showed moderately evident deposits compared with normal subjects. However, these findings were also found to the same degree as IgG deposits in animal deafness produced by KM injection. From the above results it can reasonably be concluded that the degenerated findings of the ES and deposits of the IgG in Menière's disease may possibly be the result of cochlear deafness.
Insights
The endolymphatic sac (ES) in Meniere's disease shows cell degeneration and IgG deposits, similar to experimentally induced deafness. These changes may result from cochlear damage, offering insights into Meniere's disease pathology.
Area of Science:
- Otolaryngology
- Pathology
- Immunology
Background:
- The endolymphatic sac (ES) plays a crucial role in inner ear fluid balance.
- Pathological changes in the ES are implicated in Meniere's disease.
- Understanding ES alterations can provide insights into inner ear disorders.
Purpose of the Study:
- To investigate the ultrastructural and immunological features of the endolymphatic sac (ES) in Meniere's disease.
- To compare ES findings in Meniere's disease with those in experimentally induced deafness.
- To explore the potential relationship between ES pathology and cochlear dysfunction.
Main Methods:
- Scanning electron microscopy (SEM) was used to examine the morphology of the ES epithelium.
- Immunoglobulin (IgG) staining was performed on ES tissues.
- Comparative analysis was conducted between normal subjects, Meniere's disease patients, and an animal model of deafness.
Main Results:
- Normal ES exhibited well-arranged epithelial cells across all age groups.
- Meniere's disease patients showed diverse epithelial cell degeneration in the ES.
- Similar ES degeneration and IgG deposits were observed in kanamycin-induced deafness in animals, mirroring Meniere's disease findings.
Conclusions:
- Degenerative changes in the ES and IgG deposits observed in Meniere's disease may be secondary to cochlear deafness.
- The study suggests a potential link between cochlear pathology and endolymphatic sac alterations.
- These findings contribute to understanding the pathogenesis of Meniere's disease.