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• W1920918690 abstract "The primary goal of this study was to determine whether the IGF1R in mature osteoblasts and osteocytes was required for the catabolic actions of continuous parathyroid hormone (cPTH). Igf1r was deleted from male and female FVN/B mice by breeding with mice expressing cre recombinase under control of the osteocalcin promoter (0CNIgfr1-/-). Littermates lacking the cre recombinase served as controls. PTH, 60 μg/kg/d, was administered continuously by Alzet minipumps for 4 weeks. Blood was obtained for indices of calcium metabolism. The femurs were examined by micro-computed tomography for structure, immunohistochemistry for IGF1R expression, histomorphometry for bone formation rates (BFR), mRNA levels by qPCR, and bone marrow stromal cell cultures (BMSC) for alkaline phosphatase activity (ALP+), mineralization, and osteoblast-induced osteoclastogenesis. Whereas cPTH led to a reduction in trabecular bone volume/tissue volume (BV/TV) and cortical thickness in the control females, no change was found in the control males. Although trabecular BV/TV and cortical thickness were reduced in the 0CNIgfr1-/- mice of both sexes, no further reduction after cPTH was found in the females, unlike the reduction in males. BFR was stimulated by cPTH in the controls but blocked by Igf1r deletion in the females. The 0CNIgfr1-/- male mice showed a partial response. ALP+ and mineralized colony formation were higher in BMSC from control males than from control females. These markers were increased by cPTH in both sexes, but BMSC from male 0CNIgfr1-/- also were increased by cPTH, unlike those from female 0CNIgfr1-/-. cPTH stimulated receptor activator of NF-κB ligand (RANKL) and decreased osteoprotegerin and alkaline phosphatase expression more in control female bone than in control male bone. Deletion of Igf1r blocked these effects of cPTH in the female but not in the male. However, PTH stimulation of osteoblast-driven osteoclastogenesis was blocked by deleting Igfr1 in both sexes. We conclude that cPTH is catabolic in female but not male mice. Moreover, IGF1 signaling plays a greater role in the skeletal actions of cPTH in the female mouse than in the male mouse, which may underlie the sex differences in the response to cPTH. © 2015 American Society for Bone and Mineral Research." @default.
• W1920918690 created "2016-06-24" @default.
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• W1920918690 date "2015-05-18" @default.
• W1920918690 modified "2023-09-27" @default.
• W1920918690 title "Gender-Specific Differences in the Skeletal Response to Continuous PTH in Mice Lacking the IGF1 Receptor in Mature Osteoblasts" @default.
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• W1920918690 doi "https://doi.org/10.1002/jbmr.2433" @default.
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