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Arthritis Research & Therapy
Published in: Arthritis Research & Therapy 1/2019

Open Access 01-12-2019 | Rheumatoid Arthritis | Research article

Rheumatoid arthritis synovial fibroblasts promote TREM-1 expression in monocytes via COX-2/PGE2 pathway

Authors: Anping Peng, Xinyi Lu, Jun Huang, Min He, Jianhua Xu, Hui Huang, Qubo Chen

Published in: Arthritis Research & Therapy | Issue 1/2019

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Abstract

Background

Triggering receptor expressed on myeloid cells-1 (TREM-1) is inducible on monocyte/macrophages and neutrophils and amplifies the inflammatory response. The aim of this study was to determine whether rheumatoid arthritis synovial fibroblasts (RASF) promote the expression of TREM-1 in monocytes and its potential regulatory mechanism.

Methods

Synovial fluid and paired peripheral blood from rheumatoid arthritis (RA) patients were analyzed using flow cytometry. Expression of TREM-1 in monocytes was detected after co-culture with RASF, with or without pre-treatment with toll-like receptor (TLR) ligands. Whether RASF-regulated TREM-1 level in monocytes require direct cell contact or soluble factors was evaluated by transwell experiment. COX-2 expression and PGE2 secretion in RASF were determined by quantitative PCR (qPCR) and ELISA. RASF, with and without TLR ligand stimulation, were treated with COX-2 inhibitors, COX-2 siRNA (siCOX-2) or EP1–4 antagonists, and the resulting TREM-1 level in CD14+ monocytes was measured using flow cytometry.

Results

TREM-1 was highly expressed in CD14+ cells from peripheral blood and especially synovial fluid from RA patients. The expression of TREM-1 in monocytes was increased by co-culture with RASF. TLR-ligand-activated RASF further elevated TREM-1 level. Transwell assay indicated that soluble factors played a key role in RASF-promoted expression of TREM-1 in monocytes. RASF, with or without stimulation by TLR ligands, increased secretion of PGE2 in a cyclooxygenase (COX)-2-dependent manner. PGE2 enhanced the increase in TREM-1 level in monocytes. Finally, studies using COX-2 inhibitors, COX-2 siRNA (siCOX-2) and EP1–4 antagonists, showed that RASF promotion of TREM-1 expression in monocytes was mediated by COX-2/PGE2/EP2,4 signaling.

Conclusions

Our data is the first report to reveal the critical role of RASF in upregulating TREM-1 expression in monocytes, which indicates that TREM-1 might be a novel target for RA therapy.
Appendix
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Metadata
Title
Rheumatoid arthritis synovial fibroblasts promote TREM-1 expression in monocytes via COX-2/PGE2 pathway
Authors
Anping Peng
Xinyi Lu
Jun Huang
Min He
Jianhua Xu
Hui Huang
Qubo Chen
Publication date
01-12-2019
Publisher
BioMed Central
Published in
Arthritis Research & Therapy / Issue 1/2019
Electronic ISSN: 1478-6362
DOI
https://doi.org/10.1186/s13075-019-1954-3

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