Murine BM was fractionated using a series of hematopoietic markers to characterize its osteoclast progenitor populations. We found that the early osteoclastogenic activity in total BM was recapitulated by a population of cells contained within the CD11b −/low CD45R − CD3 − CD115 high fraction.Introduction: Osteoclasts are of hematopoietic origin and they have been shown to share the same lineage as macrophages. We further characterized the phenotype of osteoclast progenitor populations in murine bone marrow (BM) by analyzing their cell surface markers. Materials and Methods:We used fluorescence-activated cell sorting (FACS) to identify the subsets of BM cells that contained osteoclast progenitors. We fractionated BM according to several markers and cultured the sorted populations for a period of 2-6 days with macrophage-colony stimulating factor (M-CSF) and RANKL. The numbers of multinucleated osteoclast-like cells (OCLs) that formed in the cultures were counted. Results: We found that the CD45R
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