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The experimental squalene encephaloneuropathy in the rat
B Gajkowska1, M Smialek, R P Ostrowski
1The Laboratory of the Ultrastructure of the Nervous System, Medical Research Center, Polish Academy of Sciences, Warsaw.
Summary
Squalene administration causes ultrastructural damage in rat nervous systems, including myelin sheath disintegration and lipid deposits. These changes differ from tellurium encephaloneuropathy, suggesting squalene is not its sole mediator.
Area of Science:
- Neuroscience
- Toxicology
- Cell Biology
Background:
- Squalene accumulation in the central nervous system (CNS) is linked to tellurium administration.
- Squalene has been hypothesized as a mediator of tellurium-induced encephaloneuropathy.
Purpose of the Study:
- To investigate the ultrastructural effects of squalene administration on the rat central and peripheral nervous systems.
- To compare squalene-induced neuropathology with known features of tellurium encephaloneuropathy.
Main Methods:
- Rats were administered squalene (20 g/kg body weight daily for 4 days).
- Nervous tissues were examined ultrastructurally at 7 and 30 days post-administration using electron microscopy.
Main Results:
- Early (7-day) changes included mitochondrial swelling, Golgi dilation, astrocyte swelling, myelin disintegration in the CNS, and Schwann cell damage with lipid deposits in the sciatic nerve.
- Later (30-day) findings revealed persistent CNS alterations, endothelial cell hypertrophy, apoptosis, narrowed blood vessels, and lipid deposits in neurons and myelin sheaths.
- Peripheral nerve showed lipid deposits in fibroblasts and extracellularly within the perineurium.
Conclusions:
- Squalene induces distinct pathological changes in both the central and peripheral nervous systems at the ultrastructural level.
- Observed alterations, particularly endothelial changes and lipid accumulation, differ from characteristic features of tellurium encephaloneuropathy.