CD14+ Monocytes and Soluble CD14 of Synovial Fluid Are Associated with Osteoarthritis Progression

Overview

Journal Arch Rheumatol

Specialty Rheumatology

Date 2023 Jan 2

PMID 36589618

Authors

Ha-Reum Lee

Sunyoung Lee

In Seol Yoo

Su-Jin Yoo

Mi-Hye Kwon

Chung-Il Joung

Ji Ah Park

Seong Wook Kang

Jinhyun Kim

Affiliations

Soon will be listed here.

Abstract

Objectives: This study aims to investigate the role of cluster of differentiation 14 (CD14) expressed monocytes and soluble CD14-mediated pathway in the synovial inflammation of knee osteoarthritis (OA).

Patients And Methods: Between May 2012 and July 2013, a total of 35 patients with knee OA (9 males, 26 females; mean age: 66.3±8.8 years; range, 52 to 79 years) were included in this cross-sectional study. Synovial fluid was obtained from knee joints of 35 OA patients. The CD14 monocytes from synovial fluid mononuclear cells (SFMCs) were isolated using the MACS. The fibroblast-like synoviocytes (FLSs) isolated from knee joint tissue were incubated with recombinant CD14 and lipopolysaccharide (LPS) for 24 h. Cytokine profiling was performed with the Luminex® Performance Assay or magnetic bead panel kit. The expression of CD14 and CD16 was analyzed by immunohistochemistry and flow cytometry.

Results: The concentration of sCD14 in synovial fluid was correlated with the interleukin-6 (IL-6) level (n=35) (ρ=0.654, p<0.001). The culture supernatants of CD14 monocytes isolated from SFMC (n=15) showed a correlation between sCD14 and IL-6 (ρ=0.784, p=0.001), along with complement component 3 (ρ=0.756, p=0.010), IL-1b (ρ=0.652, p=0.012), and tumor necrosis factor-alpha (ρ=0.806, p=0.001). Following recombinant CD14 and LPS treatment, OA FLS synergistically enhanced the secretion of IL-6, IL-8, and matrix metalloproteinase 3 (n=3, p<0.05). In five paired-samples from identical patients, the proportions of CD14 monocytes were significantly elevated in recurred synovial fluid compared to those in initial synovial fluid (p=0.043). When monocyte subsets were analyzed in SFMC (n=26), CD14CD16monocytes were abundant (p=0.019) and had higher toll-like receptor 4 expression than CD14CD16 (p<0.001).

Conclusion: Our study results suggest that CD14 monocytes and the sCD14-mediated pathway play an important role in OA aggravation through inflammatory cytokine secretion.

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