Synovial tissue in rheumatoid arthritis is a source of osteoclast differentiation factor

被引:4
作者
Gravallese, EM
Manning, C
Tsay, A
Naito, A
Pan, C
Amento, E
Goldring, SR
机构
[1] Harvard Univ, Inst Med, Boston, MA 02115 USA
[2] Beth Israel Deaconess Med Ctr, New England Baptist Bone & Joint Inst, Boston, MA USA
[3] Mol Med Res Inst, Mt View, CA USA
[4] Stanford Univ, Sch Med, Palo Alto, CA 94304 USA
来源
ARTHRITIS AND RHEUMATISM | 2000年 / 43卷 / 02期
关键词
D O I
10.1002/1529-0131(200002)43:2<250::AID-ANR3>3.0.CO;2-P
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Objective. Osteoclast differentiation factor (ODF; also known as osteoprotegerin ligand, receptor activator of nuclear factor kappa B ligand, and tumor necrosis factor-related activation-induced cytokine) is a recently described cytokine known to be critical in inducing the differentiation of cells of the monocyte/macrophage lineage into osteoclasts. The role of osteoclasts in bone erosion in rheumatoid arthritis (RA) has been demonstrated, but the exact mechanisms involved in the formation and activation of osteoclasts in RA are not known, These studies address the potential role of ODF and the bone and marrow microenvironment in the pathogenesis of osteoclast-mediated bone erosion in RA, Methods. Tissue sections from the bone-pannus interface at sites of bone erosion were examined for the presence of osteoclast precursors by the colocalization of messenger RNA (mRNA) for tartrate-resistant acid phosphatase (TRAP) and cathepsin K in mononuclear cells. Reverse transcriptase-polymerase chain reaction (RT-PCR) was used to identify mRNA for ODF in synovial tissues, adherent synovial fibroblasts, and activated T lymphocytes derived from patients with RA. Results. Multinucleated cells expressing both TRAP and cathepsin K mRNA were identified in bone resorption lacunae in areas of pannus invasion into bone in RA patients. In addition, mononuclear cells expressing both TRAP and cathepsin K mRNA (preosteoclasts) were identified in bone marrow in and adjacent to areas of pannus invasion in RA erosions. ODF mRNA was detected by RT-PCR in whole synovial tissues from patients with RA but not in normal synovial tissues. In addition, ODF mRNA was detected in cultured adherent synovial fibroblasts and in activated T lymphocytes derived from RA synovial tissue, which were expanded by exposure to anti-CD3. Conclusion, TRAP-positive, cathepsin K-positive osteoclast precursor cells are identified in areas of pannus invasion into bone in RA. ODF is expressed by both synovial fibroblasts and by activated T lymphocytes derived from synovial tissues from patients with RA, These synovial cells may contribute directly to the expansion of osteoclast precursors and to the formation and activation of osteoclasts at sites of bone erosion in RA.
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页码:250 / 258
页数:9
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