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• W2041947916 abstract "The osteopetrotic (op) mutation in mice is characterized by general skeletal sclerosis; reduced numbers of osteoclasts, macrophages, and monocytes; and failure to be cured by bone marrow transplantation. This mutation has been shown to result from an absence of colony-stimulating factor-1 (CSF-1) and reported to be cured by treatment with CSF-1. Contrary to previous reports, we have noted persistent metaphyseal sclerosis in op mice treated with CSF-1 at doses above physiological concentrations of circulating CSF-1. We pursued this observation by quantitating osteoclasts and macrophages in the first 500 μm (area A) and the subsequent 1000 μm (area B) in the proximal tibial metaphysis using tartrate-resistant acid phosphatase and F4/80 as cell markers. In untreated normal mice, osteoclasts and macrophages were found in areas A (9.1 and 13.8 cells/1000 μm2) and B (4.1 and 9.4 cells/1000 μm2), respectively. In untreated mutants, osteoclasts and macrophages as percentages of normal were, respectively, 0% and 2% (area A) and 30% and 13% (area B). After CSF-1 treatment (0.15, 0.3, 0.5, and 1.0 × 106 U/day) for 28 days, marrow cavity size and numbers of osteoclasts and macrophages increased significantly in area B. However, area A remained sclerotic, with few macrophages (3% to 20%), and although osteoclast numbers were normal, their distribution was not, being absent in subepiphyseal sites. High CSF-1 gene expression occurs at bone modeling sites, co-localizes with osteoblasts, and temporally correlates with their differentiation. The failure of physiological concentrations of circulating CSF-1 to restore osteoclasts and macrophages and to cure sclerosis in subepiphyseal areas (A) of op/op mutants suggests that this factor must be presented locally to certain site-specific osteoclast and macrophage progenitors by osteoblasts and/or endothelial cells. Furthermore, the presence of osteoclasts in some skeletal sites in untreated op mice demonstrates that the development of some osteoclasts is independent of CSF-1." @default.
• W2041947916 created "2016-06-24" @default.
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• W2041947916 date "1995-01-01" @default.
• W2041947916 modified "2023-10-03" @default.
• W2041947916 title "Colony-stimulating factor-1 injections improve but do not cure skeletal sclerosis in osteopetrotic (op) mice" @default.
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• W2041947916 doi "https://doi.org/10.1016/8756-3282(95)80009-f" @default.
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