Volume 8, Issue 3 pp. 394-405
ORIGINAL ARTICLE

The sinonasal microbiota, neural signaling, and depression in chronic rhinosinusitis

Michael Hoggard BSc (hons)

Michael Hoggard BSc (hons)

School of Biological Sciences, University of Auckland, Auckland, New Zealand

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Angela Nocera

Angela Nocera

Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA

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Kristi Biswas PhD

Kristi Biswas PhD

School of Medicine, University of Auckland, Auckland, New Zealand

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Michael W. Taylor PhD

Michael W. Taylor PhD

School of Biological Sciences, University of Auckland, Auckland, New Zealand

Maurice Wilkins Centre for Molecular Biodiscovery, University of Auckland, Auckland, New Zealand

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Richard G. Douglas MD

Richard G. Douglas MD

School of Medicine, University of Auckland, Auckland, New Zealand

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Benjamin S. Bleier MD, FACS

Corresponding Author

Benjamin S. Bleier MD, FACS

Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA

Correspondence to: Benjamin S. Bleier, MD, FACS, Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, 243 Charles Street, Boston, MA 02114; e-mail: [email protected]Search for more papers by this author
First published: 26 December 2017
Citations: 19

Funding sources for the study: Garnett Passe and Rodney Williams Memorial Foundation.

Conflicts of interest: None disclosed.

Abstract

Background

The complex relationships between the human microbiota, the immune system, and the brain play important roles in both health and disease, and have been of increasing interest in the study of chronic inflammatory mucosal conditions. We hypothesized that the sinonasal microbiota may act as a modifier of interkingdom neural signaling and, subsequently, mental health, in the upper respiratory inflammatory condition chronic rhinosinusitis (CRS). In this study we investigated associations between the sinonasal microbiota; local concentrations of the neurotransmitters serotonin, dopamine, and γ-aminobutyric acid (GABA); and depression severity in a cohort of 14 CRS patients and 12 healthy controls.

Methods

Subject demographics, clinical severity scores, depression index scores, and sinonasal swab and mucus samples were collected at the time of surgery. Bacterial communities were characterized from swabs by 16S rRNA gene-targeted sequencing and quantified by quantitative polymerase chain reaction. Mucus concentrations of the neurotransmitters serotonin, dopamine, and GABA were quantified by enzyme-linked immunosorbent assay.

Results

Several commonly “health-associated” sinonasal bacterial taxa were positively associated with higher neurotransmitter concentrations and negatively associated with depression severity. In contrast, several taxa commonly associated with an imbalanced sinonasal microbiota negatively associated with neurotransmitters and positively with depression severity. Few significant differences were identified when comparing between control and CRS subject groups, including neurotransmitter concentrations, depression scores, or sinonasal microbiota composition or abundance.

Conclusion

The findings obtained lend support to the potential for downstream effects of the sinonasal microbiota on neural signaling and, subsequently, brain function and behavior.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.