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Published in: Calcified Tissue International 2/2008

01-02-2008

Alfacalcidol-Stimulated Focal Bone Formation on the Cancellous Surface and Increased Bone Formation on the Periosteal Surface of the Lumbar Vertebrae of Adult Female Rats

Authors: HaiYan Chen, XiaoYan Tian, XiaoQing Liu, Rebecca B. Setterberg, Mei Li, Webster S. S. Jee

Published in: Calcified Tissue International | Issue 2/2008

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Abstract

Purpose

To investigate the skeletal effects of alfacalcidol alone or in combination with exercise in intact adult female rats.

Methods

Seventy-four 8.5-month-old rats were orally administered 0, 0.005, 0.025, 0.05 or 0.1 μg/kg of alfacalcidol for 12 weeks, alone or in combination with exercise. Cancellous bone histomorphometric measurements were performed on the second lumbar vertebra.

Results

At 0.05 and 0.1 μg/kg, alfacalcidol caused a significant increase in cancellous bone volume, accompanied by an increase in trabecular architecture. Percent eroded surface, bone resorption and formation were suppressed by alfacalcidol treatment. However, mineral apposition rate was significantly increased, indicating osteoblast activity was increased. A positive balance between bone formation and resorption was observed in the rats treated with the highest dose of alfacalcidol. Alfacalcidol induced a unique bone formation site (“bouton”) on the cancellous surface. These boutons connected adjacent trabeculae and increased trabecular thickness. They exhibited both smooth and scalloped cement lines, suggesting that they were formed by minimodeling- and remodeling-based bone formation. Furthermore, alfacalcidol at 0.1 μg/kg increased periosteal bone formation of the lumbar transverse processes. Bipedal stance exercise alone did not have an effect on bone balance and bone turnover. There were no interactions between alfacalcidol and bipedal stance exercise except for a decrease in bone resorption.

Conclusion

Alfacalcidol exhibited both anti-catabolic and anabolic effects on bone in intact female rats. The effect of combined treatment with alfacalcidol and bipedal stance exercise was no better than that of alfacalcidol alone.
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Metadata
Title
Alfacalcidol-Stimulated Focal Bone Formation on the Cancellous Surface and Increased Bone Formation on the Periosteal Surface of the Lumbar Vertebrae of Adult Female Rats
Authors
HaiYan Chen
XiaoYan Tian
XiaoQing Liu
Rebecca B. Setterberg
Mei Li
Webster S. S. Jee
Publication date
01-02-2008
Publisher
Springer-Verlag
Published in
Calcified Tissue International / Issue 2/2008
Print ISSN: 0171-967X
Electronic ISSN: 1432-0827
DOI
https://doi.org/10.1007/s00223-007-9086-1

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WHO estimates that half of all patients worldwide are non-adherent to their prescribed medication. The consequences of poor adherence can be catastrophic, on both the individual and population level.

Join our expert panel to discover why you need to understand the drivers of non-adherence in your patients, and how you can optimize medication adherence in your clinics to drastically improve patient outcomes.

Prof. Kevin Dolgin
Prof. Florian Limbourg
Prof. Anoop Chauhan
Developed by: Springer Medicine
Obesity Clinical Trial Summary

At a glance: The STEP trials

A round-up of the STEP phase 3 clinical trials evaluating semaglutide for weight loss in people with overweight or obesity.

Developed by: Springer Medicine