Immunohistochemical characterization of human olfactory tissue

Area of Science:

• Neuroscience
• Histopathology
• Olfactory Research

Background:

• Human olfactory disorders are poorly understood due to limitations in olfactory epithelium (OE) biopsy representativeness and lack of extensive immunohistochemical analysis.
• Autopsy tissue provides a valuable resource for understanding normal and abnormal olfactory immunohistology, guiding clinical OE biopsy sampling.
• Comparing molecular phenotypes between rodent and human OE is crucial for correlating human histopathology with olfactory dysfunction.

Purpose of the Study:

• To perform a comprehensive immunohistochemical analysis of human olfactory tissue using a wide array of antibodies.
• To characterize the cellular composition and molecular markers of human OE.
• To compare human OE findings with rodent models and esthesioneuroblastoma.

Main Methods:

• Immunohistochemical analysis of human olfactory mucosa from 21 autopsy specimens.
• Whole mount staining with neuronal markers to determine the extent of olfactory mucosa.
• Extensive antibody panel targeting cytoskeletal proteins and transcription factors applied to OE sections and esthesioneuroblastoma specimens.

Main Results:

• Neuron-rich epithelium is consistently located inferior to the cribriform plate, even in advanced age, despite metaplasia.
• Immunostaining patterns identified two distinct basal cell progenitor types in human OE, mirroring findings in rodents.
• The antibody panel provided clarity on the complex cellular makeup of esthesioneuroblastoma.

Conclusions:

• The extent of human olfactory mucosa in autopsy specimens can be readily determined, correlating with age and neurological disease.
• Identified similarities between human and rodent OE facilitate the translation of experimental findings to human studies.
• This research advances the understanding of human olfactory pathophysiology and disease.