The present invention demonstrates the biological function of a newly identified osteoclast-secreted protein. This protein, mim-1, has sequence homology with but is distinct from a previously identified neutrophil chemokine protein. Mim-1 may be a key signaling protein secreted by osteoclasts that regulates recruitment and/or differentiation of osteoblast and osteoclast precursor cells. This protein may also serve to maintain osteoclasts in a relatively inactive state prior to secretion. This mechanism is essential for regulating the mass and structural integrity of bone. This protein or an analog and/or antagonists of this protein will have potential therapeutic potential in the treatment of a variety of pathological bone diseases including osteoporosis and metastatic bone diseases.

 
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