Interferon gamma causes olfactory dysfunction without concomitant neuroepithelial damage

Tatyana Pozharskaya, Andrew P Lane

Research output: Contribution to journalArticle

Abstract

Background: Olfactory loss is a debilitating symptom of chronic rhinosinusitis (CRS). The pathophysiology of inflammatory olfactory dysfunction likely involves both conductive and sensorineural components. To study the interaction of CRS-associated inflammatory cytokines with the olfactory epithelium (OE), a transgenic mouse model was developed that allows temporally-controlled local gene expression. Interferon-gamma (IFN-γ) is a prototypical T helper 1 (Th1) cytokine linked to nonpolypoid CRS (CRSsNP), as well as sinonasal viral and bacterial infections. In this study, the effects of chronic IFN-γ expression on olfactory histology and function were investigated. Methods: IFN-γ secretion by olfactory sustentacular cells was induced in the transgenic mouse. Viability and gross behavior were unaffected. Mice were euthanized after 6 weeks of IFN-γ expression, and olfactory tissue was studied by histology, immunohistochemistry, and electro-olfactography (EOG). Findings were compared with uninduced littermates. Results: IFN-γ expression did not result in alteration of the normal histologic architecture of the neuroepithelium or lamina propria. However, EOG recordings demonstrated a significant decrease in odorant responses after IFN-γ expression. In addition, a marked increase in submucosal CD45-positive cells was observed, the majority of which were CD3-positive and CD4-positive lymphocytes. Conclusion: Chronic IFN-γ expression in the mouse OE results in diminished odorant responsiveness, despite the absence of inflammatory tissue damage. This suggests a direct effect of IFN-γ on olfactory neuron function that may underlie olfactory loss in CRSsNP or viral infections. The infiltration of submucosal lymphocytes raises the possibility that other downstream cytokines also contribute to olfactory dysfunction.

Original languageEnglish (US)
Pages (from-to)861-865
Number of pages5
JournalInternational Forum of Allergy and Rhinology
Volume3
Issue number11
DOIs
StatePublished - Nov 2013

Fingerprint

Interferon-gamma
Olfactory Mucosa
Virus Diseases
Cytokines
Transgenic Mice
Histology
CD4-Positive T-Lymphocytes
Bacterial Infections
Mucous Membrane
Immunohistochemistry
Lymphocytes
Gene Expression
Neurons

Keywords

  • Interferon gamma
  • Olfactory loss
  • Rhinosinusitis
  • Transgenic model

ASJC Scopus subject areas

  • Immunology and Allergy
  • Otorhinolaryngology

Cite this

Interferon gamma causes olfactory dysfunction without concomitant neuroepithelial damage. / Pozharskaya, Tatyana; Lane, Andrew P.

In: International Forum of Allergy and Rhinology, Vol. 3, No. 11, 11.2013, p. 861-865.

Research output: Contribution to journalArticle

@article{d9dfbb5f982e44ccaf9452eee4011176,
title = "Interferon gamma causes olfactory dysfunction without concomitant neuroepithelial damage",
abstract = "Background: Olfactory loss is a debilitating symptom of chronic rhinosinusitis (CRS). The pathophysiology of inflammatory olfactory dysfunction likely involves both conductive and sensorineural components. To study the interaction of CRS-associated inflammatory cytokines with the olfactory epithelium (OE), a transgenic mouse model was developed that allows temporally-controlled local gene expression. Interferon-gamma (IFN-γ) is a prototypical T helper 1 (Th1) cytokine linked to nonpolypoid CRS (CRSsNP), as well as sinonasal viral and bacterial infections. In this study, the effects of chronic IFN-γ expression on olfactory histology and function were investigated. Methods: IFN-γ secretion by olfactory sustentacular cells was induced in the transgenic mouse. Viability and gross behavior were unaffected. Mice were euthanized after 6 weeks of IFN-γ expression, and olfactory tissue was studied by histology, immunohistochemistry, and electro-olfactography (EOG). Findings were compared with uninduced littermates. Results: IFN-γ expression did not result in alteration of the normal histologic architecture of the neuroepithelium or lamina propria. However, EOG recordings demonstrated a significant decrease in odorant responses after IFN-γ expression. In addition, a marked increase in submucosal CD45-positive cells was observed, the majority of which were CD3-positive and CD4-positive lymphocytes. Conclusion: Chronic IFN-γ expression in the mouse OE results in diminished odorant responsiveness, despite the absence of inflammatory tissue damage. This suggests a direct effect of IFN-γ on olfactory neuron function that may underlie olfactory loss in CRSsNP or viral infections. The infiltration of submucosal lymphocytes raises the possibility that other downstream cytokines also contribute to olfactory dysfunction.",
keywords = "Interferon gamma, Olfactory loss, Rhinosinusitis, Transgenic model",
author = "Tatyana Pozharskaya and Lane, {Andrew P}",
year = "2013",
month = "11",
doi = "10.1002/alr.21226",
language = "English (US)",
volume = "3",
pages = "861--865",
journal = "International Forum of Allergy and Rhinology",
issn = "2042-6976",
publisher = "Wiley-Blackwell",
number = "11",

}

TY - JOUR

T1 - Interferon gamma causes olfactory dysfunction without concomitant neuroepithelial damage

AU - Pozharskaya, Tatyana

AU - Lane, Andrew P

PY - 2013/11

Y1 - 2013/11

N2 - Background: Olfactory loss is a debilitating symptom of chronic rhinosinusitis (CRS). The pathophysiology of inflammatory olfactory dysfunction likely involves both conductive and sensorineural components. To study the interaction of CRS-associated inflammatory cytokines with the olfactory epithelium (OE), a transgenic mouse model was developed that allows temporally-controlled local gene expression. Interferon-gamma (IFN-γ) is a prototypical T helper 1 (Th1) cytokine linked to nonpolypoid CRS (CRSsNP), as well as sinonasal viral and bacterial infections. In this study, the effects of chronic IFN-γ expression on olfactory histology and function were investigated. Methods: IFN-γ secretion by olfactory sustentacular cells was induced in the transgenic mouse. Viability and gross behavior were unaffected. Mice were euthanized after 6 weeks of IFN-γ expression, and olfactory tissue was studied by histology, immunohistochemistry, and electro-olfactography (EOG). Findings were compared with uninduced littermates. Results: IFN-γ expression did not result in alteration of the normal histologic architecture of the neuroepithelium or lamina propria. However, EOG recordings demonstrated a significant decrease in odorant responses after IFN-γ expression. In addition, a marked increase in submucosal CD45-positive cells was observed, the majority of which were CD3-positive and CD4-positive lymphocytes. Conclusion: Chronic IFN-γ expression in the mouse OE results in diminished odorant responsiveness, despite the absence of inflammatory tissue damage. This suggests a direct effect of IFN-γ on olfactory neuron function that may underlie olfactory loss in CRSsNP or viral infections. The infiltration of submucosal lymphocytes raises the possibility that other downstream cytokines also contribute to olfactory dysfunction.

AB - Background: Olfactory loss is a debilitating symptom of chronic rhinosinusitis (CRS). The pathophysiology of inflammatory olfactory dysfunction likely involves both conductive and sensorineural components. To study the interaction of CRS-associated inflammatory cytokines with the olfactory epithelium (OE), a transgenic mouse model was developed that allows temporally-controlled local gene expression. Interferon-gamma (IFN-γ) is a prototypical T helper 1 (Th1) cytokine linked to nonpolypoid CRS (CRSsNP), as well as sinonasal viral and bacterial infections. In this study, the effects of chronic IFN-γ expression on olfactory histology and function were investigated. Methods: IFN-γ secretion by olfactory sustentacular cells was induced in the transgenic mouse. Viability and gross behavior were unaffected. Mice were euthanized after 6 weeks of IFN-γ expression, and olfactory tissue was studied by histology, immunohistochemistry, and electro-olfactography (EOG). Findings were compared with uninduced littermates. Results: IFN-γ expression did not result in alteration of the normal histologic architecture of the neuroepithelium or lamina propria. However, EOG recordings demonstrated a significant decrease in odorant responses after IFN-γ expression. In addition, a marked increase in submucosal CD45-positive cells was observed, the majority of which were CD3-positive and CD4-positive lymphocytes. Conclusion: Chronic IFN-γ expression in the mouse OE results in diminished odorant responsiveness, despite the absence of inflammatory tissue damage. This suggests a direct effect of IFN-γ on olfactory neuron function that may underlie olfactory loss in CRSsNP or viral infections. The infiltration of submucosal lymphocytes raises the possibility that other downstream cytokines also contribute to olfactory dysfunction.

KW - Interferon gamma

KW - Olfactory loss

KW - Rhinosinusitis

KW - Transgenic model

UR - http://www.scopus.com/inward/record.url?scp=84888034554&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84888034554&partnerID=8YFLogxK

U2 - 10.1002/alr.21226

DO - 10.1002/alr.21226

M3 - Article

C2 - 24106006

AN - SCOPUS:84888034554

VL - 3

SP - 861

EP - 865

JO - International Forum of Allergy and Rhinology

JF - International Forum of Allergy and Rhinology

SN - 2042-6976

IS - 11

ER -