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Alfacalcidol treatment increases bone mass from anticatabolic and anabolic effects on cancellous and cortical bone in intact female rats

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Abstract

It has been reported that alfacalcidol had an anticatabolic and anabolic effect on bone in ovariectomized and aged male rat models, but this has not been tested on intact female rats. The current study was to determine the effects of alfacalcidol on cancellous and cortical bone in intact female rats with or without exercise. Seventy-four, 8.5-month-old, intact female rats were orally treated with 0, 0.005, 0.025, 0.05, or 0.1 μg/kg alfacalcidol alone or in combination with raised cage (RC) exercise for 3 months. In vivo peripheral quantitative computerized tomography (pQCT) of the proximal tibial metaphyses (PTM) and ex vivo histomorphometric analyses of the PTM and tibial shaft (TX) were performed. Only the 0.1 μg alfacalcidol/kg dose proved to be anabolic. pQCT analysis showed that this dose increased total and cortical bone mineral content and density and trabecular bone mineral density. Histomorphometrically, it induced an anabolic response by increased trabecular mass and microarchitecture from stimulated cancellous bone and bone bouton formations, and suppressed bone resorption more than bone formation on the trabecular and endocortical surfaces, to produce a positive bone balance. A positive correlation between trabecular connectivity and bone bouton numbers occurred. These findings suggest alfacalcidol treatment augments bone mass by increased cancellous bone mass and improved trabecular architecture through its anticatabolic and anabolic properties in the intact adult female rat. Last, raised cage exercise alone or the combination of raised cage and alfacalcidol was no more effective than alfacalcidol alone.

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Authors and Affiliations

  1. Division of Radiobiology, University of Utah School of Medicine, 729 Arapeen Dr. 2338, Salt Lake City, UT, 84108-1218, USA

    Xiao Qing Liu, Hai Yan Chen, Xiao Yan Tian, Rebecca B. Setterberg, Mei Li & Webster S. Jee

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  1. Xiao Qing Liu
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  2. Hai Yan Chen
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  3. Xiao Yan Tian
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  4. Rebecca B. Setterberg
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  5. Mei Li
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  6. Webster S. Jee
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Correspondence to Webster S. Jee.

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Liu, X.Q., Chen, H.Y., Tian, X.Y. et al. Alfacalcidol treatment increases bone mass from anticatabolic and anabolic effects on cancellous and cortical bone in intact female rats. J Bone Miner Metab 26, 425–435 (2008). https://doi.org/10.1007/s00774-008-0854-4

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  • DOI: https://doi.org/10.1007/s00774-008-0854-4

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