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Multiple myeloma/hypercalcemia Oyajobi BOArthritis Res Ther 2007[]; 9 Suppl 1 (Suppl 1): S4Multiple myeloma, a cancer of plasma cells, is associated with excessive tumor-induced, osteoclast-mediated bone destruction. Hypercalcemia remains the most frequent metabolic complication of myeloma in patients, and excessive osteolysis plays a major contributory role in its pathogenesis. The clinical presentation of hypercalcemia in patients varies depending on the level of ionized calcium; it can be life threatening, as in the case of hypercalcemic crisis, requiring immediate medical treatment to prevent death. During the past few years there have been exciting developments in our understanding of the pathogenesis of myeloma bone disease; in particular, key mediators of the osteoclastic bone resorption in myeloma have been identified, including receptor activator of nuclear factor-kappaB ligand (RANKL) and macrophage inflammatory protein-1alpha. There is also increasing evidence that Dickkopf 1, which has been shown to be over-expressed in myeloma patients, is also a potent stimulator of osteoclast formation and activity. Importantly, the available data suggest that RANKL is the final common mediator of osteoclastic bone resorption, irrespective of the upstream initiator molecule. This brief review presents an overview of the roles played by these mediators in inducing osteolysis in myeloma bone disease, and it discusses targeting RANKL as a potential new treatment strategy in myeloma bone disease and myeloma-associated hypercalcemia.|Animals[MESH]|Bone Resorption/etiology/metabolism/pathology[MESH]|Humans[MESH]|Hypercalcemia/*etiology/*metabolism/pathology[MESH]|Multiple Myeloma/*complications/*metabolism/pathology[MESH]|RANK Ligand/metabolism[MESH] |
