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Osteoprotegerin Inhibits Osteolysis and Decreases Skeletal Tumor Burden in Syngeneic and Nude Mouse Models of Experimental Bone Metastasis

Departments of Pharmacology/Pathology [S. M., C. C., I. S., D. L. L., P. J. K.] and Development [C. R. D.], Amgen Inc., Thousand Oaks, California 91320

Certain malignancies, including breast cancer, frequently metastasize to bone, where the tumor cells induce osteoclasts to locally destroy bone. Osteoprotegerin (OPG), a member of the tumor necrosis factor receptor family, is a negative regulator of osteoclast differentiation, activation, and survival. We tested the ability of recombinant OPG to inhibit tumor-induced osteoclastogenesis, osteolysis, and skeletal tumor burden in two animal models. In a syngeneic model, mouse colon adenocarcinoma (Colon-26) cells were injected into the left ventricle of mice. Treatment with OPG dose-dependently decreased the number and area of radiographically evident lytic bone lesions, which, at the highest dose, were undetectable. Histologically, OPG also decreased skeletal tumor burden and tumor-associated osteoclasts. In a nude mouse model, OPG treatment completely prevented radiographic osteolytic lesions caused by human MDA-MB-231 breast cancer cells. Histologically, OPG decreased skeletal tumor burden by 75% and completely eradicated MDA tumor-associated osteoclasts. In both models, OPG had no effect on metastatic tumor burden in a panel of soft tissue organs. These data indicate that OPG may be an effective therapy for preventing osteolysis and decreasing skeletal tumor burden in patients with bone metastasis.

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