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Review Question - QID 2876

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QID 2876 (Type "2876" in App Search)
Nitrogen containing bisphosphonates inhibit osteoclasts by targeting what enzyme or hormone?

HMG-CoA reductase

7%

116/1720

farnesyl diphosphate synthase

79%

1357/1720

tissue inhibitor of metalloprotease

4%

67/1720

alkaline phosphatase

7%

122/1720

calcitonin

3%

51/1720

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Bisphosphonates can be divided according to their chemical structure into the earlier non-nitrogen (e.g. clodronate and etidronate) and the newer nitrogen containing (e.g alendronate) groups. The Nitrogen containing group is significantly more potent. Nitrogen containing bisphosphonates target farnesyl diphosphate synthase, a component of the mevalonate (cholesterol) pathway. Non-nitrogen containing bisphosphonates result in cytotoxic ATP to accumulate with an end result of apoptosis. The JBJS article by Morris is a good overview of bisphosphonate basic science, usages and adverse reactions.

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