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Updated: Jul 11, 2026
Detection of Abnormal Prion Protein by Immunohistochemistry
Published on: May 5, 2023
Detection of the disease-associated isoform of the prion protein in formalin-fixed tissues by Western blot
Eric M Nicholson1, Robert A Kunkle, Amir N Hamir
1Virus and Prion Diseases of Livestock Research Unit, National Animal Disease Center, USDA, Agricultural Research Service, Ames, IA 50010, USA. eric.nicholson@ars.usda.gov
Abstract:
Clinical signs of prion disease are not specific and include a variety of differential diagnoses. Serological tests and nucleic acid-based detection methods are not applicable to prion-disease-agent detection because of the unusual nature of the infectious agent. Prion-disease diagnosis is primarily conducted by means of immunodetection of the infectious agent, typically by at least 2 distinct procedures with immunohistochemistry and Western blot being the most informative. These approaches differ in the need for formalin-fixed and frozen or fresh tissue respectively. This work describes a method for the detection of the disease-associated isoform of the prion protein by Western blot using formalin-fixed tissues. The approach requires only minimal modification of existing Western-blot procedures and could readily be incorporated into existing detection schemes for confirmatory purposes when fresh or frozen tissues are unavailable.
Insights
Detecting prion disease involves specific protein analysis. This study presents a new Western blot method to detect prion protein in formalin-fixed tissues, simplifying diagnosis when fresh samples are unavailable.
Area of Science:
- Neurology
- Biochemistry
- Pathology
Background:
- Prion diseases present non-specific clinical signs, complicating diagnosis.
- Current diagnostic methods for prion diseases are limited due to the unique nature of the infectious agent.
- Immunodetection, primarily immunohistochemistry and Western blot, are key for prion disease diagnosis, but require specific tissue types.
Purpose of the Study:
- To describe a novel Western blot method for detecting the disease-associated prion protein isoform.
- To enable prion protein detection using formalin-fixed tissues, overcoming limitations of current methods.
- To offer a compatible method for existing prion disease diagnostic workflows.
Main Methods:
- Development of a Western blot protocol for prion protein detection.
- Utilizing formalin-fixed tissues as the sample source.
- Minimal modification of established Western blot procedures.
Main Results:
- Successful detection of the disease-associated prion protein isoform in formalin-fixed tissues.
- The method requires only minor adjustments to existing Western blot protocols.
- The technique is suitable for confirmatory prion disease diagnosis.
Conclusions:
- A new Western blot method allows prion protein detection in formalin-fixed tissues.
- This technique expands diagnostic capabilities for prion diseases, especially when fresh tissues are inaccessible.
- The described method can be readily integrated into current diagnostic practices.
