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Iron deposits and multiple sclerosis
Abstract:
A recent publication described autopsy samples from five brains in which positive staining for iron was observed as surrounding demyelinated plaques. Because this has not been previously reported, autopsy material from 13 patients who were being followed up at the Multiple Sclerosis (MS) Clinic, University Hospital, The University of Western Ontario, London, Ontario, was reviewed. A total of 32 paraffin-embedded blocks containing demyelinated plaques of varying age were sectioned and stained using a standard acid ferrocyanide technique (Peris' test) for iron. Microscopic examination failed to detect the presence of significant positive staining either within or surrounding the areas of demyelination. Positive histochemical staining for iron identifies hemosiderin, the presence of which suggests either iron overload or remote hemorrhage. Support for these two processes in the pathogenesis of MS could not be provided from our material.
Insights
This study investigated iron deposits around demyelinated plaques in multiple sclerosis (MS) brains. Researchers found no evidence of iron staining in autopsy samples, questioning previous findings on iron
Area of Science:
- Neuropathology
- Neuroimmunology
- Histochemistry
Background:
- Recent studies suggested iron deposits surround demyelinated plaques in multiple sclerosis (MS).
- This observation of iron staining in MS lesions was previously unreported.
- The presence of iron, identified as hemosiderin, implies iron overload or remote hemorrhage.
Purpose of the Study:
- To investigate the presence of iron deposits in demyelinated plaques in MS autopsy samples.
- To validate or refute previous findings of iron staining surrounding MS lesions.
- To explore the potential role of iron overload or hemorrhage in MS pathogenesis.
Main Methods:
- Autopsy samples from 13 patients with MS were reviewed.
- 32 paraffin-embedded blocks containing demyelinated plaques were sectioned.
- Standard acid ferrocyanide technique (Peris' test) was used for iron staining.
Main Results:
- Microscopic examination revealed no significant positive iron staining within or surrounding demyelinated plaques.
- The study failed to detect hemosiderin, indicating no evidence of iron overload or remote hemorrhage.
- Findings did not support the hypothesis of iron deposits in the pathogenesis of MS.
Conclusions:
- The study did not find evidence supporting the presence of iron deposits around demyelinated plaques in MS.
- The results contradict previous reports suggesting iron staining in MS lesions.
- The material reviewed did not provide support for iron overload or hemorrhage in MS pathogenesis.