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Osteotropic factor responsiveness of highly purified populations of early and late precursors for human multinucleated cells expressing the osteoclast phenotype.
N Kurihara; C Civin; G D Roodman (Profiled Author: Curt Civin)
Audie Murphy VA Hospital, San Antonio, TX.
Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research 1991;6(3):257-61.
Recently we have adapted human long-term bone marrow cultures to form multinucleated cells (MNC) that express the osteoclast phenotype and used semisolid culture techniques to identify early (bipotent) and late (unipotent) mononuclear precursors for these MNC. The early precursor can form both osteoclast-like MNC and macrophage polykaryons; the late precursor forms only osteoclast-like MNC. In this study we examined the effects of osteotropic hormones and cytokines of MNC formation from highly purified populations of these early or late mononuclear precursor cells. MNC expressing the osteoclast phenotype were identified by their cross-reactivity with the 23c6 monoclonal antibody, which preferentially identifies osteoclasts. 1,25-(OH)2D3 (10(-8) M), IL-1 beta (10 u/ml), and IL-6 (100 pg/ml) stimulated formation of 23c6-positive MNC from highly purified populations of early or late precursor cells. In contrast, PTH (50 ng/ml) did not act directly on late precursor cells but only stimulated 23c6-positive MNC formation from early precursors. These results show that (1) 1,25-(OH)2D3, IL-1 beta, and IL-6 can stimulate 23c6-positive MNC formation from a highly enriched population of early and late precursors, and (2) PTH does not act on late precursors but may act indirectly on the late precursors.
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