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Published in: Respiratory Research 1/2010

Open Access 01-12-2010 | Research

Allergen particle binding by human primary bronchial epithelial cells is modulated by surfactant protein D

Authors: Carsten Schleh, Veit J Erpenbeck, Carla Winkler, Hans D Lauenstein, Matthias Nassimi, Armin Braun, Norbert Krug, Jens M Hohlfeld

Published in: Respiratory Research | Issue 1/2010

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Abstract

Background

Allergen-containing subpollen particles (SPP) are released from whole plant pollen upon contact with water or even high humidity. Because of their size SPP can preferentially reach the lower airways where they come into contact with surfactant protein (SP)-D. Our previous work demonstrated that SP-D increases the uptake of SPP by alveolar macrophages. In the present study, we investigated the uptake of SPP in human primary epithelial cells and the potential modulation by SP-D. The patho-physiological consequence was evaluated by measurement of pro-inflammatory mediators.

Methods

SPP were isolated from timothy grass and subsequently fluorescently labelled. Human primary bronchial epithelial cells were incubated with SPP or polystyrene particles (PP) in the presence and absence of surfactant protein D. In addition, different sizes and surface charges of the PP were studied. Particle uptake was evaluated by flow cytometry and confocal microscopy. Soluble mediators were measured by enzyme linked immunosorbent assay or bead array.

Results

SPP were taken up by primary epithelial cells in a dose dependent manner. This uptake was coincided with secretion of Interleukin (IL)-8. SP-D increased the fraction of bronchial epithelial cells that bound SPP but not the fraction of cells that internalized SPP. SPP-induced secretion of IL-8 was further increased by SP-D. PP were bound and internalized by epithelial cells but this was not modulated by SP-D.

Conclusions

Epithelial cells bind and internalize SPP and PP which leads to increased IL-8 secretion. SP-D promotes attachment of SPP to epithelial cells and may thus be involved in the inflammatory response to inhaled allergen.
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Metadata
Title
Allergen particle binding by human primary bronchial epithelial cells is modulated by surfactant protein D
Authors
Carsten Schleh
Veit J Erpenbeck
Carla Winkler
Hans D Lauenstein
Matthias Nassimi
Armin Braun
Norbert Krug
Jens M Hohlfeld
Publication date
01-12-2010
Publisher
BioMed Central
Published in
Respiratory Research / Issue 1/2010
Electronic ISSN: 1465-993X
DOI
https://doi.org/10.1186/1465-9921-11-83

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