TLR4 and TLR9 Expression in Different Phenotypes of RhinitisReport as inadecuate

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International Journal of OtolaryngologyVolume 2012 2012, Article ID 925164, 7 pages

Research Article

Department of Experimental Medicine, University of L-Aquila, Via Vetoio Coppito 2, L-Aquila, Italy

G.B. Bietti Foundation, IRCCS, Rome, Italy

Otorhinolaryngology Unit, S. Spirito Hospital, Rome, Italy

Faculty of Medicine and IFT-CNR, Second University of Naples, 00133 Rome, Italy

Received 12 July 2011; Accepted 4 December 2011

Academic Editor: Leonard P. Rybak

Copyright © 2012 Maria Lauriello et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Background. Toll-like receptors TLRs represent a family of evolutionarily conserved proteins, that represent a fundamental link between innate and adaptive immune responses. Aim. The purpose of this study was to investigate the expression of TLR4 and TLR9 in the normal nasal mucosa and in the mucosa of subjects with different phenotypes of rhinitis. Methodology. A confocal analysis of TLR4 and TLR9 coexpression was carried out on biopsies from the inferior turbinate obtained from 4 patients affected by persistent allergic rhinitis, 8 patients with chronic rhino-sinusitis, and 6 patients with vasomotor rhinitis The results were compared with those of specimens obtained from 4 subjects undergoing nasal surgery, but with signs of nasal inflammation. Results. TLR4 and TLR9 were expressed in the healthy nasal mucosa; TLR4 and TLR9 expression was significantly decreased in allergic rhinitis. TLR4 was over expressed in the epithelium of chronic rhino-sinusitis. Both TLRs were co-expressed in the sub-epithelial infiltrate of chronic and vasomotor rhinitis, even though this expression was higher in the former compared with the latter. Conclusions. This study indicates that TLR4 and TLR9 show a different pattern of expression in different phenotypes of rhinitis, possibly related to the type and severity of the disease.

Author: Maria Lauriello, Alessandra Micera, Paola Muzi, Lino Di Rienzo Businco, and Sergio Bonini



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