Intranasal Aspergillus fumigatus exposure induces eosinophilic inflammation and olfactory sensory neuron cell death in mice

Abstract

OBJECTIVETo determine the effects of eosinophilic inflammation on olfactory sensory neuron cell death.STUDY DESIGNMice were sensitized to intranasal Aspergillus fumigatus extract and subsequently challenged acutely or chronically with the same allergen. The olfactory neuroepithelium was assessed for immunohistochemical evidence of apoptosis and inflammation.RESULTSSensitized mice challenged with allergen demonstrated elevated eosinophil infiltration of the respiratory and olfactory mucosae, with olfactory sensory neuron apoptosis. Remarkably, massive neuronal apoptosis without eosinophil infiltration occurred in nonsensitized mice after a single dose of extract.CONCLUSIONIntranasal sensitization with A fumigatus results in a model with multifactorial effects. Protocols using A fumigatus to induce allergic rhinitis may need modification to allow confident interpretation.SIGNIFICANCEFungal allergens may contribute to anosmia through the induction of olfactory sensory neuron apoptosis, with and without prior sensitization.

Part of CIRS Nexus · Curated by Lauren Lowenstein, The Biotoxin Lady