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Aging effects on vestibulo-ocular responses in C57BL/6 mice: comparison with alteration in auditory function
Atsushi Shiga1, Takayuki Nakagawa, Meiho Nakayama
1Department of Otolaryngology, Aichi Medical University, Aichi, Japan.
Audiology & Neuro-Otology
|January 15, 2005
Summary
Age-related vestibular function in mice shows an initial increase then stabilizes, unlike auditory function which declines significantly with age. This suggests different aging mechanisms for the two systems.
Area of Science:
- Neuroscience
- Gerontology
- Otolaryngology
Background:
- Age-related hearing loss (presbycusis) is well-studied in animal models.
- Age-related changes in vestibular function are less understood.
- C57BL/6 mice serve as a model for studying age-related sensory decline.
Purpose of the Study:
- To investigate age-related changes in vestibular function using vestibulo-ocular responses in C57BL/6 mice.
- To compare the time course of age-related changes in vestibular and auditory function.
- To correlate functional deficits with histological findings in peripheral vestibular and auditory systems.
Main Methods:
- Evaluation of vestibulo-ocular reflex (VOR) gain in mice of different ages.
- Measurement of auditory brainstem response (ABR) thresholds.
- Histological analysis of peripheral auditory and vestibular structures.
Main Results:
- VOR gain increased with age until 12 weeks, then showed limited decline after 24 weeks.
- ABR thresholds remained stable from 3 to 12 weeks but significantly increased from 24 weeks onwards.
- Histological analysis revealed age-related degeneration in both auditory and vestibular peripherals, correlating with auditory functional loss.
Conclusions:
- Age-related changes in vestibular function in C57BL/6 mice follow a different temporal pattern than auditory function changes.
- Vestibular and auditory systems exhibit distinct mechanisms underlying age-related functional decline.
- Despite morphological degeneration, vestibular dysfunction was not apparent at the studied ages, suggesting compensatory mechanisms or slower progression.