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  • Title: Treatment with a sclerostin antibody increases cancellous bone formation and bone mass regardless of marrow composition in adult female rats.
    Author: Tian X, Setterberg RB, Li X, Paszty C, Ke HZ, Jee WS.
    Journal: Bone; 2010 Sep; 47(3):529-33. PubMed ID: 20561907.
    Abstract:
    The current report describes the skeletal effects of a sclerostin monoclonal antibody (Scl-AbIII) treatment at a yellow (fatty) marrow skeletal site in adult female rats. Ten-month-old female Sprague-Dawley rats were treated with vehicle or Scl-AbIII at 5 or 25 mg/kg, twice per week by s.c. injection for 4 weeks. Trabecular bone from a yellow (fatty) marrow site, the 5th caudal vertebral body (CVB), was processed undecalcified for quantitative bone histomorphometric analysis. Compared to vehicle controls, Scl-AbIII at both doses significantly increased bone formation parameters and trabecular bone volume and thickness and decreased bone resorption parameter in the trabecular bone of the CVB. As a reference, we also found that the Scl-AbIII at both doses significantly decreased bone resorption and increased bone formation and bone volume in a red (hematopoietic) marrow site, the 4th lumber vertebral body (LVB). It appears that the percentage of increase in trabecular bone volume induced by Scl-AbIII treatment was slightly larger in the LVB than in the CVB. In summary, these preclinical findings show that antibody-mediated sclerostin inhibition has significant bone anabolic effects at both red and yellow marrow skeletal sites.
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