{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,23]],"date-time":"2025-10-23T11:01:54Z","timestamp":1761217314494},"reference-count":41,"publisher":"Oxford University Press (OUP)","issue":"1","license":[{"start":{"date-parts":[[1993,1,1]],"date-time":"1993-01-01T00:00:00Z","timestamp":725846400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[1993,1,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>Malignant osteopetrosis is characterized by impaired osteoclast activity. Osteoclasts derive from hematopoietic stem cells. In osteopetrosis, marrow cavities fail to develop, resulting in extramedullary hematopoiesis and the presence of stem cells in the bloodstream. Resistance to 1,25-(OH)2D3 may be involved in the pathogenesis of the disease. Sensitivity to 1,25-(OH)2D3, calcitonin sensitivity, and expression of the osteoclast-associated vitronectin receptor (VR) was examined in cultures of circulating mononuclear cells of seven osteopetrotic infants (1.5\u20136 months old). Since peripheral blood from age-matched children contains few stem cells, umbilical cord blood was used as control. Mononucleated cells were isolated by the Ficoll-Hypaque method and cultured (106 cells per ml) in \u03b1-MEM containing 20% horse serum in presence or absence of added 1,25-(OH)2D3. VR was identified by immunochemical staining with MAb 23C6. 1,25-(OH)2D3 at 10\u22128 M significantly stimulated the formation of multinucleated cells (MNC) in cultures from all osteopetrotic patients and cord blood samples. Cells from three of five patients responded to 10\u22129 M 1,25-(OH)2D3, the minimal stimulatory concentration for cord blood. Salmon calcitonin (100 ng\/ml) partially inhibited the 10\u22128 M 1,25-(OH)2D3-induced MNC formation in cultures from three of six patients and in cultures of all cord blood samples. In both types of cultures mononuclear cells and MNC cross-reacted with MAb 23C6, and 1,25-(OH)2D3 concentration did not influence the number and percentage of these cells. This study does not support the hypothesis of 1,25-(OH)2D3 resistance in osteopetrotic infants and shows that mononuclear cells expressing VR, possibly osteoclast progenitors, develop in cultures of circulating mononuclear cells from these infants. 1,25-(OH)2D3 may not be closely involved in VR expression.<\/jats:p>","DOI":"10.1002\/jbmr.5650080109","type":"journal-article","created":{"date-parts":[[2010,2,3]],"date-time":"2010-02-03T16:44:27Z","timestamp":1265215467000},"page":"61-70","source":"Crossref","is-referenced-by-count":15,"title":["Cultured circulating mononuclear cells from osteopetrotic infants express the osteoclast-associated vitronectin receptor and form multinucleated cells in response to 1,25-dihydroxyvitamin D3"],"prefix":"10.1093","volume":"8","author":[{"given":"Giulia","family":"Cournot","sequence":"first","affiliation":[{"name":"CNRS URA 583, Universit\u00e9 Paris V, H\u00f4pital des Enfants Malades, Paris, 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