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Otosclerosis. Histopathology, light and electron microscopy
Acta Oto-Rhino-Laryngologica Belgica
|January 1, 1981
Summary
Cochlear otosclerosis, or otospongiosis, is a lytic process involving matrix vesicles and lysosomal enzymes. Its exact cause remains unknown, despite understanding its mechanism.
Area of Science:
- Oto-rhino-laryngology
- Histopathology
- Biochemistry
Background:
- Cochlear otosclerosis (otospondiosis) is common histopathologically but poorly understood clinically.
- The etiology of otospongiosis remains obscure.
- The enzymatic basis of otosclerosis has been recognized.
Purpose of the Study:
- To elucidate the underlying mechanism of otospongiosis.
- To confirm the role of matrix vesicles in calcification.
- To identify the initiating process in cochlear otosclerosis.
Main Methods:
- Histopathological analysis of cochlear tissues.
- Enzymatic assays to study matrix vesicle activity.
- Investigation of cartilaginous cell rests.
Main Results:
- Matrix vesicles are confirmed as the site of primary enzymatic calcification.
- Otospongiosis is characterized as a primary lytic process.
- Lysosomal enzymes within matrix vesicles initiate the process.
Conclusions:
- Otospongiosis is initiated by activated lysosomal enzymes in matrix vesicles.
- The process occurs within cartilaginous cell rests in the cochlea.
- The ultimate cause of otospongiosis is still undetermined.