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- W2057147519 abstract "PTH and 1,25(OH)(2)D each exert dual anabolic and catabolic skeletal effects. We assessed the potential interaction of PTH and 1,25(OH)(2)D in promoting skeletal anabolism by comparing the capacity of exogenous, intermittently injected PTH(1-34) to produce bone accrual in mice homozygous for the 1 alpha(OH)ase-null allele [1 alpha(OH)ase(-/-) mice] and in wildtype mice. In initial studies, 3-mo-old wildtype mice were either injected once daily (40 microg/kg) or infused continuously (120 microg/kg/d) with PTH(1-34) for up to 1 mo. Infused PTH reduced BMD, increased the bone resorption marker TRACP-5b, and raised serum calcium but did not increase serum 1,25(OH)(2)D. Injected PTH increased serum 1,25(OH)(2)D and BMD, raised the bone formation marker osteocalcin more than did infused PTH, and did not produce sustained hypercalcemia as did PTH infusion. In subsequent studies, 3-mo-old 1 alpha(OH)ase(-/-) mice, raised on a rescue diet, and wildtype littermates were injected with PTH(1-34) (40 microg/kg) either once daily or three times daily for 1 mo. In 1 alpha(OH)ase(-/-) mice, baseline bone volume (BV/TV) and bone formation (BFR/BS) were lower than in wildtype mice. PTH administered intermittently increased BV/TV and BFR/BS in a dose-dependent manner, but the increases were always less than in wildtype mice. These studies show that exogenous PTH administered continuously resorbs bone without raising endogenous 1,25(OH)(2)D. Intermittently administered PTH can increase bone accrual in the absence of 1,25(OH)(2)D, but 1,25(OH)(2)D complements this PTH action. An increase in endogenous 1,25(OH)(2)D may therefore facilitate an optimal skeletal anabolic response to PTH and may be relevant to the development of improved therapeutics for enhancing skeletal anabolism." @default.
- W2057147519 created "2016-06-24" @default.
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- W2057147519 date "2008-08-01" @default.
- W2057147519 modified "2023-10-18" @default.
- W2057147519 title "Exogenous PTH and Endogenous 1,25-Dihydroxyvitamin D Are Complementary in Inducing an Anabolic Effect on Bone" @default.
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- W2057147519 doi "https://doi.org/10.1359/jbmr.080318" @default.
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