RANKL expressed on synovial fibroblasts is primarily responsible for bone erosions during joint inflammation

Lynett Danks, Noriko Komatsu, Matteo M. Guerrini, Shinichiro Sawa, Marietta Armaka, George Kollias, Tomoki Nakashima, Hiroshi Takayanagi

研究成果: Contribution to journalArticle査読

105 被引用数 (Scopus)

抄録

Objective RANKL is mainly expressed by synovial fibroblasts and T cells within the joints of rheumatoid arthritis patients. The relative importance of RANKL expression by these cell types for the formation of bone erosions is unclear. We therefore aimed to quantify the contribution of RANKL by each cell type to osteoclast differentiation and bone destruction during inflammatory arthritis. Methods RANKL was specifically deleted in T cells (Tnfsf11flox/Δ Lck-Cre), in collagen VI expressing cells including synovial fibroblasts (Tnfsf11flox/Δ Col6a1-Cre) and in collagen II expressing cells including articular chondrocytes (Tnfsf11flox/Δ Col2a1-Cre). Erosive disease was induced using the collagen antibody-induced arthritis (CAIA) and collagen-induced arthritis (CIA) models. Osteoclasts and cartilage degradation were assessed by histology and bone erosions were assessed by micro-CT. Results The inflammatory joint score during CAIA was equivalent in all mice regardless of cell-targeted deletion of RANKL. Significant increases in osteoclast numbers and bone erosions were observed in both the Tnfsf11flox/Δ and the Tnfsf11flox/Δ Lck-Cre groups during CAIA; however, the Tnfsf11flox/Δ Col6a1-Cre mice showed significant protection against osteoclast formation and bone erosions. Similar results on osteoclast formation and bone erosions were obtained in CIA mice. The deletion of RANKL on any cell type did not prevent articular cartilage loss in either model of arthritis used. Conclusions The expression of RANKL on synovial fibroblasts rather than T cells is predominantly responsible for the formation of osteoclasts and erosions during inflammatory arthritis. Synovial fibroblasts would be the best direct target in RANKL inhibition therapies.

本文言語英語
ページ(範囲)1187-1195
ページ数9
ジャーナルAnnals of the Rheumatic Diseases
75
6
DOI
出版ステータス出版済み - 6 2016
外部発表はい

All Science Journal Classification (ASJC) codes

  • 免疫アレルギー学
  • リウマチ学
  • 免疫学
  • 生化学、遺伝学、分子生物学(全般)

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