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Influence of aging on peripheral nerve function and regeneration
E Verdú1, D Ceballos, J J Vilches
1Department of Cell Biology, Physiology and Immunology, Faculty of Medicine, Universitat Autònoma de Barcelona, Bellaterra, Spain. everdu@servet.uab.es
Journal of the Peripheral Nervous System : JPNS
|January 11, 2001
Summary
Aging impairs the peripheral nervous system (PNS), causing nerve fiber loss and reduced regeneration capabilities. These changes affect nerve function and recovery after injury in older individuals.
Area of Science:
- Neuroscience
- Gerontology
- Peripheral Nervous System (PNS) Research
Background:
- Aging significantly alters the morphology and function of the peripheral nervous system (PNS).
- Studies show age-related loss of myelinated and unmyelinated nerve fibers, along with myelin sheath abnormalities.
- Reduced expression of key myelin proteins (P0, PMP22, MBP) and cytoskeletal proteins contributes to nerve fiber deterioration.
Purpose of the Study:
- To investigate the comprehensive effects of aging on peripheral nerve structure and function.
- To understand the mechanisms underlying age-related decline in nerve regeneration after injury.
- To identify age-associated changes in cellular and molecular responses critical for nerve repair.
Main Methods:
- Morphological analysis of nerve fibers in elderly and younger subjects.
- Assessment of myelin protein and cytoskeletal protein expression.
- Evaluation of functional and electrophysiological properties, including nerve conduction velocity and muscle strength.
- Comparative studies on Wallerian degeneration and nerve regeneration in aged versus young animals.
Main Results:
- Observed loss of nerve fibers and myelin abnormalities (demyelination, remyelination) in aged nerves.
- Decreased expression of major myelin proteins and axonal transport of cytoskeletal proteins.
- Reduced nerve conduction velocity, muscle strength, sensory discrimination, and autonomic responses.
- Delayed Wallerian degeneration, impaired Schwann cell-axon interaction, and reduced trophic factor secretion in aged subjects.
- Slower axonal regeneration rates, decreased density of regenerating axons, and limited sprouting in older animals.
Conclusions:
- Aging leads to significant morphologic and functional deficits in the PNS, impacting nerve integrity and repair.
- Age-related changes in myelin maintenance, axonal support, and cellular responses hinder effective nerve regeneration.
- While regenerative capacity persists, it is progressively delayed and less efficient with advancing age.