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Laryngoscope. 2017 Jan;127(1):179-185. doi: 10.1002/lary.26097. Epub 2016 Jun 14.

Molecular analysis of idiopathic subglottic stenosis for Mycobacterium species.

Author information

1
Department of Otolaryngology, Vanderbilt University, Nashville, Tennessee.
2
Department of Medicine, Division of Pulmonary and Critical Care, Vanderbilt University, Nashville, Tennessee.
3
Department of Medicine, Division of Infectious Disease, Vanderbilt University, Nashville, Tennessee.
4
Department of Otolaryngology, University of Virginia Health System, Charlottesville, Virginia.
5
Department of Medicine, Division of Pulmonary and Critical Care, Mayo Clinic, Rochester, Minnesota.
6
Department of Otolaryngology, Mayo Clinic, Rochester, Minnesota.
7
Department of Otolaryngology, Johns Hopkins, Baltimore, Maryland.
8
Department of Medicine, New York University School of Medicine, New York, New York, U.S.A.
9
Department of Pathology, Microbiology and Immunology, Vanderbilt University, Nashville, Tennessee.
10
Department of Pediatrics, Division of Medical Genetics, Vanderbilt University, Nashville, Tennessee.
11
Veterans Affairs Tennessee Valley Healthcare Services, Nashville, Tennessee.

Abstract

OBJECTIVES/HYPOTHESIS:

Idiopathic subglottic stenosis (iSGS) is an unexplained obstruction involving the lower laryngeal and upper tracheal airway. Persistent mucosal inflammation is a hallmark of the disease. Epithelial microbiota dysbiosis is found in other chronic inflammatory mucosal diseases; however, the relationship between tracheal microbiota composition and iSGS is unknown. Given the critical role for host defense at mucosal barriers, we analyzed tissue specimens from iSGS patients for the presence of microbial pathogens.

METHODS:

Utilizing 30 human iSGS, 20 intubation-related tracheal stenosis (iLTS), and 20 healthy control specimens, we applied molecular, immunohistochemical, electron microscopic, immunologic, and Sanger-sequencing techniques.

RESULTS:

With unbiased culture-independent nucleic acid, protein, and immunologic approaches, we demonstrate that Mycobacterium species are uniquely associated with iSGS. Phylogenetic analysis of the mycobacterial virulence factor rpoB suggests that, rather than Mycobacterium tuberculosis, a variant member of the Mycobacterium tuberculosis complex or a closely related novel mycobacterium is present in iSGS specimens.

CONCLUSION:

These studies identify a novel pathogenic role for established large airway bacteria and provide new targets for future therapeutic intervention.

LEVEL OF EVIDENCE:

NA Laryngoscope, 127:179-185, 2017.

KEYWORDS:

ISS; Mtb; Mycobacterium; iSGS; idiopathic subglottis stenosis; laryngotracheal stenosis; tracheal stenosis

PMID:
27295947
PMCID:
PMC5156582
DOI:
10.1002/lary.26097
[Indexed for MEDLINE]
Free PMC Article

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