Bisphosphonates such as alendronate (Fosamax, Merck) and pamidronate(Aredia, CibaGeigy) are synthetic analogues of inorganicpyrophosphate. The main effect of bisphosphonates, which aredeposited on the surface of bone and ingested by osteoclastsduring bone turnover, is antiresorptive. They inhibit the mevalonatepathway in osteoclasts, enhancing apoptosis and inhibiting skeletonresorption. In adults, bisphosphonates are largely used to treatosteoporosis, although Paget's disease, metastatic breast carcinoma,and hyperparathyroidism are also indications for treatment.
The use of bisphosphonates, particularly intravenous pamidronate,has been extended to children through off-label use for osteoporoticor lytic bone conditions, including osteogenesis imperfecta,fibrous dysplasia, juvenile . . . [Full Text of this Article]
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From the Heritable Disorders Branch, National Institute of Child Health and Human Development, Bethesda, Md.
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