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Reduced expression of antimicrobial PLUNC proteins in nasal polyp tissues of patients with chronic rhinosinusitis
Author(s) -
Seshadri S.,
Lin D. C.,
Rosati M.,
Carter R. G.,
Norton J. E.,
Suh L.,
Kato A.,
Chandra R. K.,
Harris K. E.,
W. Chu H.,
Peters A. T.,
Tan B. K.,
Conley D. B.,
Grammer L. C.,
Kern R. C.,
Schleimer R. P.
Publication year - 2012
Publication title -
allergy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.363
H-Index - 173
eISSN - 1398-9995
pISSN - 0105-4538
DOI - 10.1111/j.1398-9995.2012.02848.x
Subject(s) - nasal polyps , submucosal glands , lactoferrin , immunohistochemistry , innate immune system , pathology , mucous membrane of nose , sinusitis , immune system , immunology , inflammation , serous fluid , paranasal sinuses , epithelium , nasal glands , biology , medicine , genetics
Background Chronic rhinosinusitis ( CRS ) is a disease characterized by inflammation of the nasal mucosa and paranasal sinuses. This inflammation may result in part from decreased epithelial barrier and innate immune responses, leading to frequent bacterial and fungal colonization. The objectives of this study were to investigate the expression of innate immune proteins of the palate lung and nasal epithelium clone ( PLUNC ) family in patients with CRS . Methods Nasal tissue samples were collected from control subjects and CRS patients with and without nasal polyps. Expression of the members of the PLUNC family was analyzed by real‐time PCR . Expression of SPLUNC 1 and LPLUNC 2 proteins was analyzed by ELISA , immunoblot, and immunohistochemical analysis. Results Levels of mRNA for most of the members of the PLUNC family were profoundly reduced in nasal polyps ( NP s) compared to uncinate tissue from control subjects or patients with CRS . LPLUNC 2 and SPLUNC 1 proteins were decreased in NP s of patients with CRS compared to uncinate tissue from control subjects. Immunohistochemical data revealed that within submucosal glands of sinonasal tissues, SPLUNC 1 and LPLUNC 2 were differentially expressed, in serous and mucous cells, respectively. The decrease in the expression of these molecules is probably explained by a decrease in the number of glands in NP s as revealed by correlations with levels of the glandular marker lactoferrin. Conclusions Decreased SPLUNC 1 and LPLUNC 2 in NP s reflect a profound decrease in the number of submucosal glands. Decreased glands may lead to a localized defect in the production and release of glandular innate defense molecules.