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• W2114752593 abstract "Abstract Global deletion of the Igfbp2 gene results in the suppression of bone turnover. To investigate the role of insulin‐like growth factor‐binding protein‐2 (IGFBP‐2) in regulating osteoclast differentiation, we cultured Igfbp2 −/− bone marrow cells and found a reduction in the number of osteoclasts and impaired resorption. Addition of full‐length IGFBP‐2 restored osteoclast differentiation, fusion, and resorption. To determine the molecular domains of IGFBP‐2 that were required for this effect to be manifest, Igfbp2 −/− bone marrow cells were transfected with constructs in which the heparin‐binding (HBD) or the IGF‐binding domains of IGFBP‐2 were mutated. We found that both domains were necessary for osteoclastogenesis because expression of the mutated forms of either domain failed to support the formation of functionally mature osteoclasts. To discern the mechanism by which IGFBP‐2 regulates osteoclast formation, PTEN abundance and phosphorylation status as well as AKT responsiveness to IGF‐I were analyzed. Igfbp2 −/− cells had elevated levels of PTEN and phospho‐PTEN compared with controls. Expression of wild‐type IGFBP‐2 reduced the level of PTEN to that of wild‐type cells. Cells expressing the IGF‐binding mutant showed suppression of PTEN and phospho‐PTEN equivalent to the wild‐type protein, whereas those expressing the IGFBP‐2 HBD mutant showed no PTEN suppression. When the ability of IGF‐I to stimulate AKT activation, measured by Thr 308 and Ser 473 phosphorylation, was analyzed, stimulation of Ser 473 in response to IGF‐I in preosteoclasts required the presence of intact IGFBP‐2. This effect was duplicated by the addition of a CK2 inhibitor that prevents the phosphorylation of PTEN. In contrast, in fully differentiated osteoclasts, stimulation of Thr 308 phosphorylation required the presence of intact IGFBP‐2. We conclude that IGFBP‐2 is an important regulator of osteoclastogenesis and that both the heparin‐ and the IGF‐binding domains of IGFBP‐2 are essential for the formation of fully differentiated and functional osteoclasts. © 2012 American Society for Bone and Mineral Research" @default.
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• W2114752593 date "2012-01-23" @default.
• W2114752593 modified "2023-10-11" @default.
• W2114752593 title "Insulin-like growth factor-binding protein-2 is required for osteoclast differentiation" @default.
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• W2114752593 doi "https://doi.org/10.1002/jbmr.545" @default.
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