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The interaction of monocytes with rheumatoid synovial cells is a key step in LIGHT‐mediated inflammatory bone destruction
Author(s) -
Ishida Satoru,
Yamane Shoji,
Nakano Saori,
Yanagimoto Toru,
Hanamoto Yukie,
MaedaTanimura Miki,
ToyosakiMaeda Tomoko,
Ishizaki Jun,
Matsuo Yoshiyuki,
Fukui Naoshi,
Itoh Tsunetoshi,
Ochi Takahiro,
Suzuki Ryuji
Publication year - 2009
Publication title -
immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.297
H-Index - 133
eISSN - 1365-2567
pISSN - 0019-2805
DOI - 10.1111/j.1365-2567.2008.02965.x
Subject(s) - rankl , cathepsin k , osteoclast , cd14 , multinucleate , cathepsin , tumor necrosis factor alpha , microbiology and biotechnology , cd163 , monocyte , cancer research , bone resorption , immunology , chemistry , macrophage , medicine , activator (genetics) , biology , receptor , immune system , in vitro , biochemistry , enzyme
Summary Formation of osteoclasts and consequent joint destruction are hallmarks of rheumatoid arthritis (RA). Here we show that LIGHT, a member of the tumour necrosis factor (TNF) superfamily, induced the differentiation into tartrate‐resistant acid phosphatase (TRAP)‐positive multinucleated cells (MNCs) of CD14 + monocytes cocultured with nurse‐like cells isolated from RA synovium, but not of freshly isolated CD14 + monocytes. Receptor activator of nuclear factor‐κB ligand (RANKL) enhanced this LIGHT‐induced generation of TRAP‐positive MNCs. The MNCs showed the phenotypical and functional characteristics of osteoclasts; they showed the expression of osteoclast markers such as cathepsin K, actin‐ring formation, and the ability to resorb bone. Moreover, the MNCs expressed both matrix metalloproteinase 9 (MMP‐9) and MMP‐12, but the latter was not expressed in osteoclasts induced from CD14 + monocytes by RANKL. Immunohistochemical analysis showed that the MMP‐12‐producing MNCs were present in the erosive areas of joints in RA, but not in the affected joints of osteoarthritic patients. These findings suggested that LIGHT might be involved in the progression of inflammatory bone destruction in RA, and that osteoclast progenitors might become competent for LIGHT‐mediated osteoclastogenesis via interactions with synoviocyte‐like nurse‐like cells.