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Axonal changes in chronic demyelinated cervical spinal cord plaques.
G Lovas1, N Szilágyi, K Majtényi
1Department of Neurology, 'Jahn Ferenc' Teaching Hospital, Laboratory of Neuromorphology, Semmelweis University Medical School, Budapest, Hungary.
Brain : a Journal of Neurology
|January 29, 2000
Summary
Multiple sclerosis patients show significant axonal loss in the spinal cord, even in areas without active inflammation. This suggests slow degeneration, not acute damage, contributes to long-term disability.
Area of Science:
- Neuroscience
- Pathology
- Immunology
Background:
- Axonal injury and loss are linked to disability in multiple sclerosis (MS).
- The impact of chronic inflammation on axons in MS is not fully understood.
- Previous studies confirm axonal damage, particularly in active inflammatory sites.
Purpose of the Study:
- To quantitatively analyze axonal loss and degeneration in the cervical spinal cord of secondary progressive MS patients.
- To compare axonal changes in demyelinated plaques, normal-appearing white matter (NAWM), and control tissue.
Main Methods:
- Quantitative morphometrical analysis of cervical spinal cord samples.
- Neurofilament immunostaining to identify and quantify axons.
- Comparison between MS plaques, NAWM, and control tissues.
Main Results:
- Significant reduction in axonal density (axons/mm²) observed in both plaques and NAWM of MS patients compared to controls.
- Smaller axons (approx. <3.3 µm diameter) appeared more affected.
- Reduced neurofilament immunostaining intensity in plaques compared to NAWM and controls.
Conclusions:
- Axonal loss is a prominent feature in the cervical spinal cord of secondary progressive MS patients.
- Degenerative axonal changes occur in both demyelinated plaques and NAWM.
- Findings support the theory of slow axonal degeneration, rather than acute injury, as a primary driver of chronic disability in MS.