The purpose of this study was to design a method by which immunoperoxidase staining can be applied to formalin-fixed, paraffin-embedded tissue sections to demonstrate amyloid deposits in cerebral and systemic amyloidotic tissues. We used anti-prion protein, anti-beta-protein, anti-amyloid A, and anti-prealbumin antisera. The tissue sections were first treated with 100% formic acid for 5, 20, or 60 minutes and the unlabeled immunoperoxidase method (biotin-streptavidin system reagents) was used. This formic acid pretreatment enhanced immunoreactivity of the amyloid deposits which reacted positively with specific antiserum.
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