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Transganglionic gracile response following limb amputation in man.
1Department of Neurology, National Chushin-Matsumoto Hospital, Japan.
Acta Neuropathologica
|October 25, 2000
Summary
Peripheral nerve injury, such as limb amputation, triggers a transganglionic response in the human sensory nervous system, leading to gracile neuroaxonal dystrophy (NAD) in dorsal column nuclei. This response, characterized by axonal spheroids, indicates nerve degeneration and potential regeneration.
Area of Science:
- Neuroscience
- Pathology
- Histology
Background:
- Gracile neuroaxonal dystrophy (NAD) is a specific axonal alteration in sensory neurons.
- Experimental studies suggest peripheral axotomy accelerates NAD formation, implying a transganglionic response.
Observation:
- Postmortem histopathological examination of dorsal column nuclei from three human patients who underwent limb amputation.
- Analysis focused on gracile and cuneate nuclei contralateral and ipsilateral to the amputation site.
Findings:
- Limb amputation induced reactive gliosis and axonal spheroids in the ipsilateral gracile or cuneate nuclei.
- These changes, positive for growth-associated protein-43, ubiquitin, and neuropeptide Y, were absent in contralateral nuclei.
- The observed changes confirm a transganglionic response to peripheral nerve injury in humans.
Implications:
- This study demonstrates a transganglionic response to peripheral axotomy in the human sensory nervous system.
- The findings suggest that nerve injury can lead to degenerative and potentially regenerative changes in central sensory pathways.
- Age and time since injury may influence the extent of these neuroaxonal responses.