fleisch@sams.ch Whether they directly affect other cell types such as osteoblasts, osteocytes, and tumor cells Corresponding author: R. Graham G. Russell, The Oxford University Institute of Musculoskeletal Sciences, The Botnar Research Centre, Nuffield Department of Orthopaedic Surgery, Nuffield Orthopaedic Centre, Headington, Oxford, United Kingdom.We use cookies to help provide and enhance our service and tailor content and ads. They act by binding the mineral component of bone and interfere with the action of osteoclasts. The initial rationale for their use in humans was their potential in preventing the dissolution of "Diphosphonate" redirects here. A possible mechanism of the specific action of bisphosphonates on osteoclasts: tiludronate preferentially affects polarized osteoclasts having ruffled borders. Bisphosphonates: mechanisms of action. Nitrogen containing bisphosphonates mechanism.
Mechanisms of action of bisphosphonates: similarities and differences and their potential influence on clinical efficacy Osteoporos Int. Sato M, Grasser W. Effects of bisphosphonates on isolated rat osteoclasts as examined by reflected light microscopy. When BP treatment is stopped, bone resorption increases in two phases. Four mechanisms appear to be involved: 1) inhibition of osteoclast recruitment; 2) inhibition of osteoclastic adhesion; 3) shortening of the life span of osteoclasts; and 4) inhibition of osteoclast activity. Great progress has been made over the past two decades in understanding the mechanism of action of the bisphosphonates. 1995 Aug; 17 (2):137–144. After binding to bone mineral, the drugs are internalized into bone-resorbing osteoclasts by endocytosis. Evidence shows that they reduce the risk of fracture in post-menopausal women with osteoporosis.The uses of bisphosphonates include the prevention and treatment of In osteoporosis and Paget's, the most popular first-line bisphosphonate drugs are Bisphosphonates are recommended as a first line treatments for post-menopausal osteoporosis.Long-term treatment with bisphosphonates produces anti-fracture and bone mineral density effects that persist for 3–5 years after an initial 3–5 years of treatment.After five years of medications by mouth or three years of intravenous medication among those at low risk, bisphosphonate treatment can be stopped.Bisphosphonates reduce the risk of fracture and bone painBisphosphonates can also reduce mortality in those with multiple myeloma and prostate cancer.Evidence suggests that the use of bisphosphonates would be useful in the treatment of Bisphosphonates have been used to reduce fracture rates in children with the disease Bisphosphonates, when administered intravenously for the treatment of cancer, have been associated with A number of cases of severe bone, joint, or musculoskeletal pain have been reported, prompting labeling changes.Some studies have identified bisphosphonate use as a risk factor for In large studies, women taking bisphosphonates for osteoporosis have had unusual fractures ("bisphosphonate fractures") in the Three meta analyses have evaluated whether bisphosphonate use is associated with an increased risk of esophageal cancer.
Simple bisphosphonates (e.g., clodronate, etidronate) are metabolized in the osteoclast cytosol to ATP analogues that induce osteoclast apoptosis. Mechanisms of action of bisphosphonates on osteoclasts. If enough BP has been incorporated into new bone formed during prior treatment, that bisphosphonate may be released and again inhibit bone resorption. Owing to their bone-binding characteristics, bisphosphonates target to the skeleton, where they primarily act by inhibiting osteoclastic bone resorption. Because a bisphosphonate group mimics the structure of pyrophosphate, it can inhibit activation of enzymes that utilize pyrophosphate. The bisphosphonates are a class of drugs used in various diseases of calcium metabolism. First-generation BPs, such as clodronate and etidronate, are metabolized intracellularly to analogues of ATP. Fleisch H(1). By continuing you agree to the Copyright © 2020 Elsevier B.V. or its licensors or contributors. bisphosphonates are ingested by osteoclasts and work by two different methods depending on presence of nitrogen atom on the alkyl chain. Authors R G G Russell 1 , N B Watts, F H Ebetino, M J Rogers.
This chapter describes the history of the development, chemistry, biological actions, and molecular mechanisms of action of bisphosphonates.
ScienceDirect ® is a registered trademark of Elsevier B.V.Copyright © 2008 Elsevier Inc. All rights reserved.ScienceDirect ® is a registered trademark of Elsevier B.V. 2008 Jun;19(6):733-59. doi: 10.1007/s00198-007-0540-8. The nitrogen-containing bisphosphonates, such as alendronate, act as inhibitors of farnesyl-pyrophosphate synthase, which leads to inhibition of the prenylation of many intracellular signaling proteins. It is not to be confused with Their non-medical use was to soften water in irrigation systems used in orange groves. The first phase occurs over weeks to months as the concentration on the surface of bone decreases. It also highlights the newer developments in the field of study of bisphosphonates.
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