Reciprocal cross-talk between RANKL and interferon-gamma-inducible protein 10 is responsible for bone-erosive experimental arthritis

Cited 82 time in Web of Science Cited 88 time in Scopus
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Arthritis & Rheumatism 2008;58:1332-1342
Interferon--inducible protein 10 (IP-10; also called CXCL10), a chemokine important in the migration and proliferation of T cells, is induced in a wide variety of cell types. However, the role of IP-10 in rheumatoid arthritis (RA) remains largely unknown. The purpose of this study was to examine the potential role of IP-10 in bone resorption and RA through examination of a mouse model of collagen-induced arthritis (CIA).

The effects of IP-10 on mouse T cells during osteoclast differentiation were examined in migration assays. The bone-erosive activity of IP-10 was determined in vivo in a mouse model of CIA by histologic and immunostaining analyses. Cytokine levels in serum and culture medium were measured with sandwich enzyme-linked immunosorbent assays.

Serum concentrations of IP-10 were significantly higher in mice with CIA than in control mice. RANKL greatly induced IP-10 expression in osteoclast precursors, but not in mature osteoclasts. IP-10 stimulated the expression of RANKL and tumor necrosis factor (TNF) in CD4+ T cells and induced osteoclastogenesis in cocultures of CD4+ T cells and osteoclast precursors. However, IP-10 did not induce RANKL or TNF in CD8+ T cells. Treatment with neutralizing antibody to IP-10 significantly inhibited the infiltration of CD4+ T cells and F4/80+ macrophages into the synovium and attenuated bone destruction in mice with CIA. Furthermore, levels of RANKL and TNF were inhibited by antibody to IP-10. Bone erosion was observed in mice infected with an IP-10 retrovirus.

Our findings suggest that IP-10 plays a critical role in the infiltration of CD4+ T cells and F4/80+ macrophages into inflamed joints and causes bone destruction. Our results provide the first evidence that IP-10 contributes to the recruitment of inflammatory cells and is involved in bone erosion in inflamed joints.
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College of Dentistry/School of Dentistry (치과대학/치의학대학원)Dept. of Dentistry (치의학과)Journal Papers (저널논문_치의학과)
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