Related Experiment Videos
Auditory brainstem response thresholds in a mouse mutant with selective outer hair cell loss.
A Schrott1, K Stephan, H Spoendlin
1Department of Otolaryngology, University of Innsbruck, Austria.
Summary
Mutant mice with WV/WV cochlear pathology exhibit a consistent loss of outer hair cells, impacting auditory brainstem responses. Inner hair cells remain unaffected, offering insights into cochlear cell function.
Area of Science:
- Otolaryngology
- Neuroscience
- Genetics
Background:
- Mutant animal models are crucial for understanding cochlear pathologies.
- The WV/WV mouse mutation presents a unique form of cochlear dysfunction.
Purpose of the Study:
- To investigate the cellular and functional consequences of the WV/WV mutation in mice.
- To characterize the specific hair cell defects and their impact on auditory function.
Main Methods:
- Longitudinal study of homozygous WV/WV mutant mice throughout their lifespan.
- Auditory brainstem response (ABR) measurements to assess hearing thresholds.
- Sequential temporal bone analysis using surface preparations to examine cochlear structures.
Main Results:
- WV/WV mice consistently displayed a selective loss of outer hair cells across the entire cochlea.
- No progressive degeneration of the organ of Corti was observed.
- Auditory brainstem responses were elevated by approximately 50 dB SPL compared to controls.
- Inner hair cells were present in normal numbers and appeared structurally normal.
Conclusions:
- The WV/WV mutation causes a non-progressive, selective loss of outer hair cells.
- This hair cell defect leads to significant hearing impairment.
- WV/WV mice serve as a valuable model for studying outer hair cell function and related hearing loss.