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Pathway Description
Alendronate Action Pathway (New Revised)
Homo sapiens
Drug Action Pathway
Alendronate also known as alendronic acid is a bisphosphonate drug that is used to treat osteoporosis by preventing osteoclastic bone resorption. Alendronate is a second-generation bisphosphonate as it contains a nitrogen group that acts to inhibit farnesyl pyrophosphate synthase. It is administered orally, with low oral bioavailability it is recommended to not consume a meal an hour within the administration so as to not decrease the availability of the drug within the body. The drug binds to bone hydroxyapatite, when it undergoes resorption the alendronate is released and taken into the osteoclast by endocytosis. Within the cytosol of the osteoclast alendronate then acts by inhibiting farnesyl pyrophosphate synthase, which is essential for the prenylation of proteins needed for osteoclast survival. Some vitamin supplements may need to be taken in conjunction such as vitamin D , and avoidance of multivalent ions such as calcium, antacids and divalent ions as they will interrupt the absorption of the drug.
References
Alendronate Pathway (New Revised) References
Lin JH, Chen IW, Deluna FA, Hichens M: Renal handling of alendronate in rats. An uncharacterized renal transport system. Drug Metab Dispos. 1992 Jul-Aug;20(4):608-13.
Pubmed: 1356743
Porras AG, Holland SD, Gertz BJ: Pharmacokinetics of alendronate. Clin Pharmacokinet. 1999 May;36(5):315-28. doi: 10.2165/00003088-199936050-00002.
Pubmed: 10384857
Russell RG, Watts NB, Ebetino FH, Rogers MJ: Mechanisms of action of bisphosphonates: similarities and differences and their potential influence on clinical efficacy. Osteoporos Int. 2008 Jun;19(6):733-59. doi: 10.1007/s00198-007-0540-8.
Pubmed: 18214569
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