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The expression of osteoclast markers on foreign body giant cells.

Bone and Mineral 1994 November
The expression of some candidate osteoclast markers, tartrate-resistant acid phosphatase (TRAP), macrophage associated antigens (M phi Ag), and vitronectin receptor (VNR) on foreign body giant cells (FBGCs) was investigated in peri-implant tissues of loosened total joint arthroplasties. Osteoclasts showed distinct staining characteristics. They were strongly TRAP-positive at tartrate concentrations of 50-200 mM and expressed VNR and a restricted range of M phi Ag. In contrast, FBGCs were shown to be significantly heterogeneous. Significant numbers of FBGCs were TRAP-positive at a 100 mM tartrate concentration and some were more intense than osteoclasts. A population of FBGCs did not express M phi Ag such as CD11b, but expressed VNR. It was demonstrated that these candidate osteoclast markers were also positive on FBGCs. These results have highlighted the difficulty in distinguishing these two cell lineages and suggested that there might be some uncertainty in defining osteoclast-like cells in culture studies.

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