dc.contributor.author | Berges, Alexandra J. | |
dc.contributor.author | Ospino, Rafael | |
dc.contributor.author | Lina, Ioan A. | |
dc.contributor.author | Collins, Samuel | |
dc.contributor.author | Chan-Li, Yee | |
dc.contributor.author | Gelbard, Alexander | |
dc.contributor.author | Hillel, Alexander T. | |
dc.contributor.author | Motz, Kevin M. | |
dc.date.accessioned | 2023-02-16T18:11:14Z | |
dc.date.available | 2023-02-16T18:11:14Z | |
dc.date.issued | 2023-01-21 | |
dc.identifier.issn | 0023-852X | |
dc.identifier.other | eISSN 1531-4995 | |
dc.identifier.other | PubMed ID36633350 | |
dc.identifier.uri | http://hdl.handle.net/1803/18002 | |
dc.description.abstract | Objective(s):Tracheostomy-associated granulation tissue is a common, recurrent problem occurring secondary to chronic mucosal irritation. Although granulation tissue is composed of predominantly innate immune cells, the phenotype of monocytes and macrophages in tracheostomy-associated granulation tissue is unknown. This study aims to define the myeloid cell population in granulation tissue secondary to tracheostomy. Methods:Granulation tissue biopsies were obtained from 8 patients with tracheostomy secondary to laryngotracheal stenosis. Cell type analysis was performed by flow cytometry and gene expression was measured by quantitative real-time polymerase chain reaction. These methods and immunohistochemistry were used to define the monocyte/macrophage population in granulation tissue and were compared to tracheal autopsy control specimens. Results:Flow cytometry demonstrated macrophages (CD45+CD11b+) and monocytes (CD45+(FSCSSClow)-S-low) represent 23.2 & PLUSMN; 6% of the granulation tissue cell population. The M2 phenotype (CD206) is present in 77 +/- 11% of the macrophage population and increased compared to the M1 phenotype (p = 0.012). Classical monocytes (CD45+CD14(high)CD16(low)) were increased in granulation tissue compared to controls (61.2 +/- 7% and 30 +/- 8.5%, p = 0.038). Eighty-five percent of macrophages expressed pro-inflammatory S100A8/A9 and 36 +/- 4% of macrophages co-localized CD169, associated with tissue-resident macrophages. M2 gene expression (Arg1/CD206) was increased in granulation tissue (3.7 +/- 0.4, p = 0.035 and 3.5 +/- 0.5, p = 0.047) whereas M1 gene expression (CD80/CD86) was similar to controls (p = 0.64, p = 0.3). Immunohistochemistry of granulation tissue demonstrated increased cells co-localizing CD11b and CD206. Conclusions:M2 macrophages are the dominant macrophage phenotype in tracheostomy-associated granulation tissue. The role of this cell type in promoting ongoing inflammation warrants future investigation to identify potential treatments for granulation tissue secondary to tracheostomy. | en_US |
dc.description.sponsorship | ACKNOWLEDGMENTS Research reported in this publication was supported by the National Institute on Deafness and Other Communication Disorders of the National Institutes of Health under award numbers 1R01DC018567, R21DC017225, and R01HL146401 and the Burroughs Wellcome Fund SCRIPS Scholarship. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. | en_US |
dc.language.iso | en_US | en_US |
dc.publisher | Laryngoscope | en_US |
dc.rights | This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made. | |
dc.rights.uri | https://onlinelibrary.wiley.com/doi/10.1002/lary.30557 | |
dc.subject | granulation tissue | en_US |
dc.subject | granuloma | en_US |
dc.subject | laryngotracheal stenosis | en_US |
dc.subject | M2 macrophage, | en_US |
dc.subject | macrophage polarization | en_US |
dc.subject | mono- cytes | en_US |
dc.subject | tracheostomy | en_US |
dc.title | Myeloid Phenotypes in Tracheostomy-Associated Granulation Tissue | en_US |
dc.type | Article | en_US |
dc.identifier.doi | 10.1002/lary.30557 | |