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Bone loss represents a major unsolved problem in rheumatoid arthritis (RA). The skeletal complications of RA consist of focal bone erosions and periarticular osteoporosis at sites of active inflammation, and generalized bone loss with reduced bone mass. New evidence indicates that osteoclasts are key mediators of all forms of bone loss in RA. TNF-alpha is(More)
OBJECTIVE To investigate the cellular mechanism of bone destruction in collagen-induced arthritis (CIA). METHODS After induction of CIA in DA rats, a histologic study of the advanced arthritic lesion was carried out on whole, decalcified joints from the hindpaws of affected animals. To conclusively identify osteoclasts, joint tissue sections were stained(More)
Interleukin (IL)-11 is a multifunctional cytokine whose role in osteoclast development has not been fully elucidated. We examined IL-11 production by primary osteoblasts and the effects of rat monoclonal anti-mouse glycoprotein 130 (gp130) antibody on osteoclast formation, using a coculture of mouse osteoblasts and bone marrow cells. IL-1, TNF alpha, PGE2,(More)
Rheumatoid arthritis is characterized by progressive synovial inflammation and joint destruction. While matrix metalloproteinases (MMPs) are implicated in the erosion of unmineralized cartilage, bone destruction involves osteoclasts, the specialized cells that resorb calcified bone matrix. RANK ligand (RANKL) expressed by stromal cells and T cells, and its(More)
OBJECTIVE Rheumatoid arthritis (RA) is associated with increased rates of cardiovascular disease. Reduced small artery elasticity (SAE) and large artery elasticity (LAE) and increased systemic vascular resistance (SVR) have been found in other high-risk groups. In the present study, we sought to determine whether arterial elasticity was reduced and SVR was(More)
OBJECTIVE To study the effect of zoledronic acid (ZA) on synovial inflammation, structural joint damage, and bone metabolism in rats during the effector phase of collagen-induced arthritis (CIA). METHODS CIA was induced in female dark agouti rats. At the clinical onset of CIA, rats were assigned to treatment with vehicle or single subcutaneous doses of ZA(More)
Osteoblastic stromal cells are capable of supporting osteoclast formation from hematopoietic precursors in the presence of osteotropic factors such as 1alpha,25(OH)(2)D(3), PTH, and IL-11. Osteoblastic stromal cells produce receptor activator of NF-kappaB ligand (RANKL), a type II membrane protein of the TNF ligand family, in response to these agents.(More)
The POEMS syndrome is an infrequently reported multisystem disorder which presents usually as an obscure polyneuropathy, with almost all cases reported in Japan. A 64 yr old caucasian man presented with a 12 mth history of a severe sensorimotor neuropathy in association with dermato-endocrine features. Detection of a monoclonal IgG kappa paraprotein and(More)
The concept that changes in the number of bone cells, either overproduction of osteoelasts or underproduction of osteoblasts, might provide the pathogenetic basis of osteoporosis, represents a paradigm shift in thinking of this disease. In vitro and in vivo investigation of the cytokines that regulate these processes has led to new ways of examining the(More)
Sera from 103 patients with chronic inflammatory bowel disease (IBD) were tested prospectively for antibodies against neutrophil cytoplasmic antigens (anti-neutrophil cytoplasm antibodies, ANCA) and endothelial cell surface antigens (anti-endothelial cell antibodies, AECA) by indirect immunofluorescence (IIF) and assays based on whole fixed neutrophils,(More)