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Metabolic disorder of otoconia after streptomycin intoxication
Abstract:
Little is known about the origin or the metabolism of otoconia. Streptomycin sulfate was found to cause a decrease in their number on the otolithic membrane of the utricle and saccule in guinea pigs. The remaining otoconia on the otolithic membrane varied in shape and size and giant otoconia with multilayered arrangement were observed by means of a scanning electron microscope. These otoconia contained the normal amount of calcium in the form of standard calcium calcite crystal. The lost otoconia were found attached to the surface of some vestibular dark cells. Otoconia in this new position were irregular, shrunken or fragmented. Their calcium content, measured with an X-ray micro-analyzer, was variably diminished. The dark cells appeared to be actively engaged in absorption of calcium ions, from the attached otoconia. The dark cell is considered to be a receptacle for the disposal of otoconia.
Insights
Streptomycin sulfate reduces otoconia number in guinea pigs. Vestibular dark cells absorb calcium from lost otoconia, suggesting a disposal role.
Area of Science:
- Vestibular system research
- Otolithic membrane biology
- Calcium metabolism in inner ear
Background:
- The origin and metabolism of otoconia remain poorly understood.
- Otoconia are calcium carbonate structures crucial for balance.
Purpose of the Study:
- To investigate the effects of streptomycin sulfate on otoconia.
- To explore the interaction between otoconia and vestibular dark cells.
Main Methods:
- Administration of streptomycin sulfate to guinea pigs.
- Scanning electron microscopy of otolithic membranes.
- X-ray micro-analysis of otoconia calcium content.
Main Results:
- Streptomycin sulfate decreased otoconia number and altered remaining otoconia morphology.
- Lost otoconia were found attached to vestibular dark cells, showing fragmentation and reduced calcium.
- Vestibular dark cells appeared to actively absorb calcium from these otoconia.
Conclusions:
- Vestibular dark cells may function in the disposal of damaged or lost otoconia.
- This study provides insights into otoconia metabolism and potential mechanisms of otoconial dysfunction.