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Age-dependent effects on sensory axonal excitability in normal mice
Chimeglkham Banzrai1, Hiroyuki Nodera1, Saki Higashi1
1Department of Neurology, Tokushima University, Tokushima, Japan.
Neuroscience Letters
|December 3, 2015
Summary
Sensory nerve excitability changes with age in mice, particularly in ion currents. These findings in peripheral nerves offer insights into aging sensory systems and potential therapies.
Area of Science:
- Neuroscience
- Physiology
- Gerontology
Background:
- Peripheral nerve function is crucial for sensory perception.
- Age-related changes in neuronal function can lead to sensory deficits.
- Understanding these changes is key to developing targeted therapies.
Purpose of the Study:
- To investigate age-dependent alterations in peripheral sensory nerve excitability.
- To identify specific neuronal ion current changes associated with aging.
- To establish a foundation for understanding age-related sensory symptoms.
Main Methods:
- Serial recordings of peripheral nerve excitability in mice.
- Utilized the threshold tracking technique to measure excitability indices.
- Employed computer modeling to analyze age-related changes in ion conductances.
Main Results:
- Maturation (10 weeks) showed increased early hyperpolarization and superexcitability.
- Aging (60 weeks) revealed downward shifts in hyperpolarizing electrotonus and increased superexcitability.
- Computer modeling identified Barrett-Barrett, H, and slow K+ conductances as significantly affected by age.
Conclusions:
- Significant age-related changes occur in peripheral sensory nerve excitability and ion currents.
- These findings provide a basis for understanding age-dependent sensory dysfunction.
- The study highlights potential for developing age-specific, channel-targeting therapies.
