[Otoconia : Current aspects of research]

Area of Science:

• Biomineralization
• Otolaryngology
• Materials Science

Background:

• Otoconia are essential biocomposites in the inner ear, primarily composed of calcite (>90%) and organic material (<10%).
• Their mean size is approximately 10 µm, with a distinct external cylindrical, bulbous shape and internal branching structures.
• Morphological changes, or degeneration, can occur due to various factors, impacting their function.

Purpose of the Study:

• To investigate the morphological characteristics of otoconia.
• To understand the mechanisms of otoconia degeneration.
• To establish artificial otoconia as a model for studying these processes.

Main Methods:

• Scanning electron microscopy (SEM) for intact otoconia identification.
• Physical and chemical analytical methods to trace particle origins after degeneration.
• In vitro induction of degeneration using pH alterations, electrolyte imbalance, and complex formation.

Main Results:

• SEM is crucial for identifying intact otoconia morphology.
• Physical and chemical analyses can identify the origin of degenerated otoconia particles.
• In vitro experiments demonstrated that pH changes, electrolyte imbalance, and complex formation induce irreversible otoconia degeneration.

Conclusions:

• Artificial (biomimetic) otoconia provide a viable model system for studying otoconia.
• Chemical influences significantly impact otoconia integrity, leading to degeneration.
• Understanding these degenerative processes is key for potential therapeutic interventions.