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European Journal of Clinical Microbiology & Infectious Diseases

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01-10-2012 | Article

Dectin-1 is inducible and plays a crucial role in Aspergillus-induced innate immune responses in human bronchial epithelial cells

Authors: W.-K. Sun, X. Lu, X. Li, Q.-Y. Sun, X. Su, Y. Song, H.-M. Sun, Y. Shi

Published in: European Journal of Clinical Microbiology & Infectious Diseases | Issue 10/2012

Abstract

Airway epithelial cells are the first cells to be challenged upon contact with the conidia of Aspergillus. In response, they express pattern-recognition receptors that play fundamental roles as sentinels and mediators of pulmonary innate immunity. The C-type lectin Dectin-1 is expressed predominantly on the surface of myeloid lineage cells. We examined the induction, regulation, and functions of Dectin-1 in pulmonary epithelial cells by challenging human bronchial epithelial (HBE) cells with A. fumigatus. Inflammatory, antimicrobial peptide genes and reactive oxygen species (ROS) were quantified, with and without knockdown of Dectin-1. We found that A. fumigatus induced the expression of Dectin-1 mRNA and protein in HBE cells in a toll-like receptor (TLR) 2-dependent manner. In addition, A. fumigatus-mediated generation of ROS was dependent on the upregulation of Dectin-1. Moreover, A. fumigatus actively induced the expression of TNFα, GM-CSF, IL8, HBD2, and HBD9. Knockdown of Dectin-1 inhibited TNFα, IL8, HBD2, and HBD9 expression. Hence, Dectin-1 was required for the upregulation of pro-inflammatory cytokines and antimicrobial peptides. Finally, knockdown of TLR2 significantly inhibited Dectin-1 upregulation. Our results demonstrate the novel induction of Dectin-1 in human bronchial epithelial cells and its critical role in the innate immune response against A. fumigatus in non-phagocytic cells.

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Title: Dectin-1 is inducible and plays a crucial role in Aspergillus-induced innate immune responses in human bronchial epithelial cells
Authors: W.-K. Sun
X. Lu
X. Li
Q.-Y. Sun
X. Su
Y. Song
H.-M. Sun
Y. Shi
Publication date: 01-10-2012
Publisher: Springer-Verlag
Published in: European Journal of Clinical Microbiology & Infectious Diseases / Issue 10/2012
Print ISSN: 0934-9723
Electronic ISSN: 1435-4373
DOI: https://doi.org/10.1007/s10096-012-1624-8

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