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06:02
Detection of Neuritic Plaques in Alzheimer's Disease Mouse Model
Published on: July 26, 2011
Cholesterol in the senile plaque: often mentioned, never seen.
Thibaud Lebouvier1, Claire Perruchini, Maï Panchal
1Escourolle Neuropathology Laboratory, La Salpêtrière Hospital, Assistance Publique, Hôpitaux de Paris and UPMC, Paris Universitas, Paris, France.
Acta Neuropathologica
|November 6, 2008
Summary
Cholesterol enrichment in senile plaques (SPs) is uncertain. New research suggests previous staining methods were flawed, indicating SPs may not be cholesterol-rich and resorufin could be a novel amyloid marker.
Area of Science:
- Neuroscience
- Biochemistry
- Pathology
Background:
- Senile plaques (SPs) are key pathological hallmarks of Alzheimer's disease.
- Previous studies suggested SPs are enriched in cholesterol based on specific staining techniques.
Purpose of the Study:
- To re-evaluate the cholesterol content of senile plaques.
- To investigate the reliability of commonly used histological methods for detecting cholesterol in SPs.
- To identify potential novel markers for amyloid.
Main Methods:
- Histological staining using filipin and a cholesterol oxidase-based method.
- Control experiments were performed in the absence of cholesterol oxidase.
- Analysis of staining after lipid extraction.
- Investigation of resorufin binding to brain tissue.
Main Results:
- Staining persisted in the absence of cholesterol oxidase, indicating false-positive results.
- Filipin staining remained after lipid extraction, further challenging cholesterol enrichment.
- Resorufin, a byproduct of the histoenzymatic method, bound to SPs and neurofibrillary tangles independently of cholesterol.
- Resorufin shows potential as a novel marker for amyloid.
Conclusions:
- The proposed cholesterol enrichment of senile plaques has not been definitively proven.
- Existing histological methods for assessing cholesterol in SPs may yield false-positive results.
- Resorufin represents a promising cholesterol-independent marker for amyloid deposits.
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