The beneficial effect of Icariin on bone is diminished in osteoprotegerin-deficient mice

Bone
Dong ZhengWan-Xin Zhen

Abstract

Osteoprogeterin (OPG) plays an important role in regulating bone homeostasis by inhibiting osteoclastogenesis and bone resorption. Icariin is the major ingredient of Herba Epimedii, which exerts anabolic and anti-resorptive effects on bone, but the mechanism remains unknown. In this study, we evaluated the role of OPG in Icariin-mediated beneficial effects on bone. Twelve-week-old Opg knockout (KO) male mice and their wild type (WT) littermates were orally administered with Icariin (0.3 mg/g) everyday for 8 weeks. Bone mass and microstructure in the right proximal tibiae were analyzed with micro-computed tomography (μCT). Bone remodeling was evaluated with serum biochemical analyses and bone histomorphometry. The colonies of fibroblast and osteoblast from bone marrow derived cells were quantified. The mRNA expressions of osteoblast and osteoclast related genes in trabecular bone from the femora were analyzed by real-time PCR. Icariin treatment led to greater trabecular bone volume and trabecular number compared with vehicle treatment in WT mice. Icariin treatment increased bone formation parameters while it decreased bone resorption parameters in WT mice; however, the anabolic response of trabecular bone to Icariin treatment wa...Continue Reading

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