Immunohistochemical study of intermediate filament proteins on routinely processed, celloidin-embedded human temporal...

Area of Science:

• Otopathology
• Immunohistochemistry
• Histology

Background:

• Immunohistochemical studies on temporal bone sections typically require modified fixation techniques.
• Routinely formalin-fixed, celloidin-embedded human temporal bone sections are abundant but difficult to study using immunohistochemistry.
• A method for immunostaining these routinely processed specimens is needed for otopathologic research.

Purpose of the Study:

• To develop and validate a new method for immunohistochemical staining of routinely formalin-fixed, celloidin-embedded human temporal bone sections.
• To retrieve masked antigenicity in these tissues for light microscopic analysis.

Main Methods:

• A novel technique involving immersion of slides in saturated sodium hydroxide in methanol for 30 minutes at room temperature prior to immunostaining.
• Application of this method to 45 celloidin-embedded human temporal bone sections.
• Staining with monoclonal antibodies against keratin, vimentin, neurofilament, glial fibrillary acidic protein, and desmin using a streptavidin-biotin procedure.

Main Results:

• The new method successfully retrieved masked antigenicity in formalin-fixed, celloidin-embedded temporal bone sections.
• Immunohistochemical staining results were equivalent to those obtained with modified fixatives, cryosections, or immuno-electron microscopy.
• The technique demonstrated effectiveness for a range of intermediate filament proteins.

Conclusions:

• A simple, effective method for immunostaining routinely processed, celloidin-embedded human temporal bone sections has been developed.
• This technique allows for the study of extensive existing collections of temporal bone specimens.
• The method opens new avenues in immuno-otopathology research.