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- W4365444249 abstract "Background β-Arrestin 2 (β-arr2) binds activated parathyroid hormone (PTH) receptors stimulating internalization. PTH stimulates both anabolic and catabolic effect on bone depending on the way it is administered. Intermittent PTH stimulation increases trabecular bone formation in mice, but this is decreased in mice lacking β-arr 2, suggesting a role for β-arr 2 in the anabolic effects of PTH. The role of β-arr 2 in the catabolic effects of continuous PTH (cPTH) treatment is not known.Objective To assess the effects of cPTH administration on bone in mice lacking β-arr 2 compared to wild-type (WT).Methods Groups of male and female WT or β-arr2 knockout (KO) mice were administered either PTH or phosphate-buffered saline by osmotic pumps for 2 weeks. Following treatment, serum calcium and phosphate levels were measured, bone structure and mineral density were measured by microcomputed tomography, and bone cells measured by static and dynamic histomorphometry.Results β-arr2 KO had no effects on skeletal development in mice of either sex. PTH treatment caused hypercalcemia and hypophosphatemia and decreased trabecular and cortical bone only in male WT mice. β-arr2 KO in male mice completely abrogated the effects of PTH on bone, while in female β-arr2 KO mice, PTH treatment increased trabecular bone with no effects on cortical bone.Conclusions These results demonstrate a profound sex effect on skeletal responses to cPTH treatment, suggesting a protective effect of estrogen on bone loss. β-arr2 plays a role in restraining the anabolic effects of PTH in both male and female mice." @default.
- W4365444249 created "2023-04-15" @default.
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- W4365444249 date "2023-04-12" @default.
- W4365444249 modified "2023-09-27" @default.
- W4365444249 title "β-Arrestin 2 knockout prevents bone loss in response to continuous parathyroid hormone stimulation in male and female mice" @default.
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- W4365444249 doi "https://doi.org/10.1080/03008207.2023.2199086" @default.
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