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• W2015598533 abstract "Abstract We report on a case of osteoclast‐poor osteopetrosis who received a hematopoietic stem cell graft and, despite hematological engraftment, showed little signs of response in the skeletal defect. Clinical and laboratory studies supported the concept that the bone microenvironment remained abnormal, thus reducing the clinical response to transplantation. Introduction : Osteopetrosis is a rare genetic disorder characterized by severely reduced bone resorption resulting from a defect in either osteoclast development (osteoclast‐poor osteopetrosis) or activation (osteoclast‐rich osteopetrosis). Patients with osteoclast‐rich osteopetrosis can be rescued by allogenic hematopoietic stem cell transplantation; however, little information exists concerning the success of transplantation as a treatment for osteoclast‐poor osteopetrosis. We report on a child with osteoclast‐poor osteopetrosis whose diagnosis was delayed, consequently receiving a cord blood transplant from an unrelated donor at the age of 8 years. Engraftment was deemed successful by peripheral blood genotyping, although >3 years after transplantation there was little rescue of the skeletal defect and anemia, and extramedullary hematopoiesis persisted. Materials and Methods : Peripheral blood mononuclear cells from the osteopetrosis patient, before and after transplantation, were used to generate osteoclasts in vitro in the presence of macrophage colony‐stimulating factor (M‐CSF) and RANKL. Results : Before transplantation few, small mononuclear osteoclasts formed (F‐actin ring‐positive cells, co‐localizing with vitronectin receptor [αvβ3 integrin] and TRACP) associated with occasional, small resorption lacunae. Low levels of collagen C‐terminal telopeptide (CTx) fragments were released from these cultures as assessed by ELISA (CrossLaps; patient, 12.85 nM; control, 448.6 nM). In contrast, osteoclasts formed in cultures after transplantation formed to a similar degree to control cultures from healthy individuals: large numbers of osteoclasts containing numerous nuclei were present, and approximately 50% of the surface of bone slices was resorbed, associated with intermediate levels of collagen fragment release (116.48 nM). The culture data reflect the histopathology and radiological findings and also support previous studies showing that neither M‐CSF nor RANKL rescues osteoclast‐poor osteopetrosis. Conclusions : This is the first case reported in which a successful hematopoietic engraftment failed to correct an osteopetrotic skeletal defect, and this finding may be credited to the age at which the child was transplanted." @default.
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• W2015598533 date "2005-12-01" @default.
• W2015598533 modified "2023-10-10" @default.
• W2015598533 title "Limited Rescue of Osteoclast-Poor Osteopetrosis After Successful Engraftment by Cord Blood From an Unrelated Donor" @default.
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• W2015598533 doi "https://doi.org/10.1359/jbmr.050807" @default.
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