Synovial fluid macrophages are capable of osteoclast formation and resorption

Iannis Adamopoulos, A. Sabokbar, B. P. Wordsworth, A. Carr, D. J. Ferguson, Nick A. Athanasou

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

To determine whether synovial fluid (SF) macrophages isolated from the SF of osteoarthritis (OA), rheumatoid arthritis (RA) and pyrophosphate arthropathy (PPA) joints are capable of osteoclast formation, and to investigate the cellular and humoral factors required for this to occur, SF macrophages (CD14+) were isolated from the knee joint SF from patients with OA, RA and PPA and cultured for up to 14 days with macrophage-colony stimulating factor (M-CSF) and soluble receptor activator for nuclear factor-κB ligand (RANKL) or tumour-necrosis factor-α (TNF-α) and interieukin-1α (IL-1α). Osteoclast differentiation was assessed by expression of tartrate-resistant acid phosphatase (TRAP) and vitronectin receptor (VNR), F-actin ring formation and lacunar resorption. Osteoclast formation and lacunar resorption was seen in RANKL-treated cultures of SF macrophages isolated from OA, RA and PPA joints with the largest amount of resorption noted in RA and PPA SF macrophage cultures. In TNFα/IL-1α-treated RA and PPA SF macrophage cultures, osteoclasts capable of lacunar resorption were also formed. Lacunar resorption was more extensive in RANKL than TNFα/IL-1α-treated cultures. These findings indicate that SF macrophages are capable of differentiating into mature osteoclasts capable of lacunar resorption. M-CSF in combination with RANKL or TNFα/IL-1α was required for osteoclast formation. As inflammatory synovial fluids contain an increase in the number of macrophages and an increase in the amounts of RANKL, TNFα and IL-1α, these findings suggest that one means whereby bone erosions may form in rheumatoid or crystal arthritis is by differentiation of synovial fluid macrophages into osteoclasts.

Original languageEnglish (US)
Pages (from-to)35-43
Number of pages9
JournalJournal of Pathology
Volume208
Issue number1
DOIs
StatePublished - Jan 2006
Externally publishedYes

Fingerprint

Synovial Fluid
Osteoclasts
Macrophages
Joint Diseases
Rheumatoid Arthritis
Interleukin-1
Osteoarthritis
Joints
Integrin alphaVbeta3
Macrophage Colony-Stimulating Factor Receptors
Macrophage Colony-Stimulating Factor
Knee Joint
Actins
Tumor Necrosis Factor-alpha
diphosphoric acid
Ligands
Bone and Bones

Keywords

  • Macrophages
  • Osteoarthritis
  • Osteoclasts
  • Pyrophosphate
  • Rheumatoid arthritis
  • Synovial fluid

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

Cite this

Adamopoulos, I., Sabokbar, A., Wordsworth, B. P., Carr, A., Ferguson, D. J., & Athanasou, N. A. (2006). Synovial fluid macrophages are capable of osteoclast formation and resorption. Journal of Pathology, 208(1), 35-43. https://doi.org/10.1002/path.1891

Synovial fluid macrophages are capable of osteoclast formation and resorption. / Adamopoulos, Iannis; Sabokbar, A.; Wordsworth, B. P.; Carr, A.; Ferguson, D. J.; Athanasou, Nick A.

In: Journal of Pathology, Vol. 208, No. 1, 01.2006, p. 35-43.

Research output: Contribution to journalArticle

Adamopoulos, I, Sabokbar, A, Wordsworth, BP, Carr, A, Ferguson, DJ & Athanasou, NA 2006, 'Synovial fluid macrophages are capable of osteoclast formation and resorption', Journal of Pathology, vol. 208, no. 1, pp. 35-43. https://doi.org/10.1002/path.1891
Adamopoulos, Iannis ; Sabokbar, A. ; Wordsworth, B. P. ; Carr, A. ; Ferguson, D. J. ; Athanasou, Nick A. / Synovial fluid macrophages are capable of osteoclast formation and resorption. In: Journal of Pathology. 2006 ; Vol. 208, No. 1. pp. 35-43.
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