Abstract
The anabolic effects of insulin-like growth factors (IGFs) are modulated by a family of IGF-binding proteins (IGFBPs). Among the six known IGFBPs, IGFBP-5 is considered to play a role in bone formation. To investigate the effects of IGFBP-5 on bone mineral and matrix properties, femurs from transgenic mice overexpressing IGFBP-5 under the control of the osteocalcin promoter were evaluated by Fourier Transform Infrared Imaging (FTIRI). Analyses were done at the time of maximal osteocalcin expression (5 weeks). The spectroscopic parameters monitored were mineral-to-matrix ratio (indicative of the relative amount of mineral present), mineral crystallinity (index of the mineral crystal size and perfection) and collagen maturity (reflecting the ratio of non-reducible and reducible collagen cross-links). Multiple fields were selected for each femur, ranging from epiphysis to diaphysis. Previously, we showed that these transgenic mice display decreased osteoblastic function and osteopenia. In the present work, FTIRI showed that transgenic mice as compared to wild types have a different pattern of bone mineralization and matrix maturation. Specifically, cortical bone, primary spongiosa, and secondary ossification centers had lower values for mineral-to-matrix ratio and collagen maturity. Differences were not statistically significant in all cases although the trends were consistent. The mineral crystallinity did not vary significantly between the two groups, implying that the crystal maturation of mineral was not affected by IGFBP-5 overexpression. This study demonstrates that femurs from transgenic mice over expressing IGFBP-5 under the control of the osteocalcin promoter have modest alterations in mineral and matrix distribution, consistent with a role of IGF in osteoblast maturation.
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This work was supported by NIH grants DK42424 and AR046121.
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Atti, E., Boskey, A.L. & Canalis, E. Overexpression of IGF-Binding Protein 5 Alters Mineral and Matrix Properties in Mouse Femora: An Infrared Imaging Study. Calcif Tissue Int 76, 187–193 (2005). https://doi.org/10.1007/s00223-004-0076-2
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DOI: https://doi.org/10.1007/s00223-004-0076-2