IMR Press / FBE / Volume 2 / Issue 1 / DOI: 10.2741/E67

Frontiers in Bioscience-Elite (FBE) is published by IMR Press from Volume 13 Issue 2 (2021). Previous articles were published by another publisher on a subscription basis, and they are hosted by IMR Press on imrpress.com as a courtesy and upon agreement with Frontiers in Bioscience.

Open Access Article

MUC1 expression by human airway epithelial cells mediates pseudomonas aeruginosa adhesion

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1 Department of Physiology and Lung Center, Temple University School of Medicine, Philadelphia, PA
2 Department of Molecular Medicine, Kumamoto University, Kumamoto, Japan,
3 Department of Pediatrics, University of Maryland School of Medicine, Baltimore, MD

*Author to whom correspondence should be addressed.

Academic Editor: Rakesh Srivastava

Front. Biosci. (Elite Ed) 2010, 2(1), 68–77; https://doi.org/10.2741/E67
Published: 1 January 2010
(This article belongs to the Special Issue Cancer chemoprevention - 2)
Abstract

Human MUC1 (Muc1 in animals) is an extensively O-glycosylated membrane-tethered mucin expressed on the surface of epithelial cells and some cells of the hematopoietic system. Recently, we showed that the hamster Muc1 on Chinese hamster ovary (CHO) cells served as a binding site for Pseudomonas aeruginosa (PA) through interaction between bacterial flagellin and the Muc1 ectodomain. Because CHO cells are known to produce an atypical pattern of protein glycosylation, we determined whether or not PA interacted with MUC1 endogenously expressed on human airway epithelial cells. Knock down of MUC1 expression in bronchial (NuLi-1) or alveolar (A549) epithelial cells by RNA interference significantly reduced PA binding to the cells. Conversely, over-expression of MUC1 in HEK293 cells increased bacterial adherence. By confocal microscopy, PA and MUC1 were colocalized on the surface of NuLi-1 cells. Taken together, these results confirm our previous observations in CHO cells and suggest that MUC1 serves as a binding site for PA on the surface of airway epithelial cells, which may have important consequences in the pathogenesis of PA lung infections.

Keywords
Mucin
Toll-Like Receptor
Innate Immunity
Cystic Fibrosis
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