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Radiculoneuropathy of ageing rats: a quantitative study
1Department of Neuropathology, Tokyo Metropolitan Institute for Neurosciences, Japan.
Neuropathology and Applied Neurobiology
|March 1, 1988
Summary
Aging affects nerve fibers, with growth peaking around 400 days and significant degeneration after 700 days in rat sciatic nerves. Two distinct aging mechanisms impact myelinated peripheral nerve fibers.
Area of Science:
- Neuroscience
- Aging Research
- Morphology
Background:
- Aging leads to structural and functional changes in the peripheral nervous system.
- Understanding age-related nerve fiber degeneration is crucial for neurological health.
- The sciatic nerve is a key component of the peripheral nervous system, susceptible to age-related changes.
Purpose of the Study:
- To quantitatively and morphometrically investigate the effects of aging on myelinated nerve fibers in the rat sciatic nerve.
- To identify the age of onset and progression of degenerative changes in nerve fibers.
- To elucidate the underlying mechanisms of age-related peripheral nerve fiber degeneration.
Main Methods:
- Quantitative and morphometric analysis of myelinated nerve fibers.
- Use of 1.0-micron semi-thin sections for detailed structural examination.
- Employing a particle size analyzer (TGA 10, Zeiss) for precise measurements.
Main Results:
- Nerve fiber and axon growth observed until approximately 400 days of age.
- Significant destruction and disappearance of myelinated nerve fibers became evident after 700 days of age.
- Two independent mechanisms identified: early axonal atrophy/loss and later segmental demyelination/remyelination.
Conclusions:
- Age-related degeneration of peripheral nerve fibers involves distinct early and late mechanisms.
- Axonal atrophy/loss initiates early and affects distal nerve regions.
- Segmental demyelination and remyelination begin later, originating from proximal spinal roots.