Discoveries, drugs and skeletal disorders

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Abstract
Bone turnover, in which cells of the osteoclast lineage resorb bone and cells of the osteoblast lineage deposit bone, normally occurs in a highly regulated manner throughout life. Perturbations to these processes underlie skeletal disorders, such as osteoporosis, which are common, chronic and disabling, and increase with age. On the basis of empirical observations or on understanding of the endocrinology of the skeleton, excellent bone-resorption inhibitors, but few anabolic agents, have been developed as therapeutics for skeletal disorders. However, powerful new genomic and genetic tools are uncovering new loci that regulate the activity of both osteoclasts and osteoblasts, and these hold great promise for future drug development.