Format

Send to

Choose Destination
Am J Respir Cell Mol Biol. 2016 Nov;55(5):749-757.

Functional Toll-Like Receptor 9 Expression and CXCR3 Ligand Release in Pulmonary Sarcoidosis.

Author information

1
1 Department of Pneumology, Centre for Medicine, Medical Centre-University of Freiburg, Freiburg, Germany.
2
2 Respiratory Division, Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada.
3
3 Clinical and Experimental Pathology, Division of Clinical Medicine, Research Centre Borstel, Borstel, Germany.
4
4 Airway Research Center North (ARCN), Member of the German Center for Lung Research, Borstel, Germany; and.
5
5 BioMaterialBank North, Division of Clinical Medicine, Research Centre Borstel, Borstel, Germany.

Abstract

Sarcoidosis is a granulomatous disease characterized by a T-helper type 1 (Th1) cell-dominated alveolitis. As a role of bacteria in the pathogenesis of sarcoidosis has been discussed, Toll-like receptors (TLRs) may be involved in the initiation of a first immune reaction. We analyzed expression and functional relevance of several TLRs in bronchoalveolar lavage (BAL) cells from patients with pulmonary sarcoidosis. In parallel, we determined the release of C-X-C motif chemokine 9 (CXCL9), CXCL10, and CXCL11 by BAL cells from patients with pulmonary sarcoidosis. Nucleotide-binding oligomerization domain-containing protein (NOD) 1 and 2, TLR2, TLR6, and TLR9 expression by BAL cells was analyzed by real-time RT-PCR and cell surface expression by flow cytometry. Chemokine release was measured in BAL cell culture supernatants by ELISA. We found increased TLR9 mRNA expression in patients with sarcoidosis with chest X-ray type I and II and TLR9 protein expression in BAL cells from patients with chest X-ray type II and III. Stimulation with CpG nucleotides increased CXCL10 release by BAL cells from patients with sarcoidosis type II significantly compared with control subjects or other patients with sarcoidosis. In contrast, no increase in TNF, IL-12p40, or CXCL8 was detected. Spontaneous release of CXCL10, but not CXCL9 or CXCL11, by cultured BAL cells was also highest in cells from patients with chest X-ray type II. We found a significant association between TLR9 expression and CD4+ lymphocytes in BAL. Our data demonstrate that TLR9 ligands may contribute to the immunopathogenesis of sarcoidosis via induction of CXCL10 release in the alveolar macrophages.

KEYWORDS:

CXCR3 ligands; Toll-like receptors; alveolitis; bronchoalveolar lavage; sarcoidosis

PMID:
27390897
DOI:
10.1165/rcmb.2015-0278OC
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Atypon
Loading ...
Support Center