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- W2095103645 abstract "Previously, we demonstrated that the human parathyroid hormone (1-34) fragment (hPTH(1-34)) increased bone strength in proportion to its effects on BMD and cortical bone structure in the murine femur by comparing cyclic vs. daily administration of hPTH(1-34). Both cyclic and daily regimens increased vertebral BMD similarly at 7 weeks. Here, we have examined the effects of daily and cyclic PTH regimens on bone structure and cellular activity by static and dynamic histomorphometry. Twenty-week-old, intact female C57BL/J6 mice were treated with the following regimens (n=7 for each group): daily injection with vehicle for 7 weeks [control]; daily injection with hPTH(1-34) (40 microg/kg/day) for 7 weeks [daily PTH]; and daily injection with hPTH(1-34) (40 microg/kg/day) and vehicle alternating weekly for 7 weeks [cyclic PTH]. At days 9 and 10, and 2 and 3 prior to euthanasia, calcein (10 mg/kg) was injected subcutaneously. At the end of study, the lumbar vertebrae 1-3 and the left femora were excised, cleaned, and processed for histomorphometry. In the lumbar vertebrae, daily and cyclic PTH regimens significantly increased cancellous bone volume (BV/TV), trabecular number, trabecular osteoclast and osteoblast perimeters, trabecular mineral apposition rate (MAR) and bone formation rate (BFR), and periosteal MAR and BFR compared to control, with no significant difference between the two PTH-treated groups. Increased trabecular tunneling was observed in both PTH-treated groups. Both regimens tended to increase vertebral cortical bone formation parameters with the effects at the periosteum site being more marked than those at the endosteum site, resulting in a significant increase in cortical width. In the femur, the effects of cyclic PTH on BV/TV, trabecular width and number, trabecular and endocortical osteoblast and osteoclast perimeters, cortical width, and trabecular and periosteal BFR were less marked than those of daily PTH. A cyclic PTH regimen was as effective as a daily regimen in improving cancellous and cortical bone microarchitecture and cellular activity in the murine vertebra." @default.
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- W2095103645 date "2007-02-01" @default.
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- W2095103645 title "Effects of cyclic vs. daily treatment with human parathyroid hormone (1–34) on murine bone structure and cellular activity" @default.
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- W2095103645 doi "https://doi.org/10.1016/j.bone.2006.09.010" @default.
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