Disturbance of lipid composition in spinal cord of rabbits with experimental allergic encephalomyelitis
Abstract:
EAE in rabbits was induced by means of inoculation of purified myelin of homologous spinal cord with complete Freund's adjuvant. The content of all the major lipid classes was studied by biochemical and histochemical methods in the different parts of spinal cord and in the brain stem in combination with morphological control for the demyelinating process presence. The most expressed myelin damage was found in the lumbar and sacral parts of spinal cord. In the same parts the content of phospholipids, cerebrosides, and free cholesterol decreased and cholesterol esters were shown to accumulate. Histochemical analysis supported these findings and revealed that the loss of lipids occurred directly in the demyelination foci. Changes in total ganglioside content and in ganglioside fractions ratio were not observed. In the brain stem neither morphological, nor biochemical changes were found. On the basis of these data it was concluded that pathological processes of periaxonal demyelination, induced by the sensitization with purified myelin, have not damaged neuronal structures and not involved the brain.
Insights
Experimental autoimmune encephalomyelitis (EAE) in rabbits showed significant myelin damage in the spinal cord, with specific lipid changes in demyelination foci. The brain and neuronal structures remained unaffected.
Area of Science:
- Neuroscience
- Biochemistry
- Immunology
Background:
- Experimental autoimmune encephalomyelitis (EAE) is an animal model for demyelinating diseases.
- Understanding lipid changes during demyelination is crucial for therapeutic development.
Purpose of the Study:
- To investigate the biochemical and histochemical changes in lipids during EAE in rabbits.
- To correlate lipid alterations with the extent of demyelination in the spinal cord and brain stem.
Main Methods:
- Induction of EAE in rabbits using purified homologous spinal cord myelin and complete Freund's adjuvant.
- Biochemical and histochemical analysis of major lipid classes in spinal cord and brain stem.
- Morphological assessment for demyelination.
Main Results:
- Most significant myelin damage observed in the lumbar and sacral spinal cord.
- Decreased phospholipids, cerebrosides, and free cholesterol, with accumulating cholesterol esters in affected spinal cord regions.
- Lipid loss localized to demyelination foci; no significant changes in gangliosides.
- No morphological or biochemical changes detected in the brain stem.
Conclusions:
- EAE in rabbits primarily affects the spinal cord, with specific lipid alterations in demyelination sites.
- The induced periaxonal demyelination does not damage neuronal structures or involve the brain.
- Findings provide insights into the biochemical basis of EAE-induced demyelination.
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