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Updated: Jun 2, 2026

Drug Treatment and In Vivo Imaging of Osteoblast-Osteoclast Interactions in a Medaka Fish Osteoporosis Model
Published on: January 1, 2017
New and emerging antiresorptive treatments in osteoporosis
Lars Rejnmark1, Leif Mosekilde
1Department of Endocrinology and Internal Medicine, MEA, Aarhus Sygehus, Aarhus University Hospital, Tage-Hansensgade 2, DK 8000 Aarhus C, Denmark. rejnmark@post6.tele.dk
Abstract:
Bisphosphonates has for many years been the mainstay of antiresorptive treatment, acting predominantly by inducing apoptosis of mature osteoclasts. During recent years, an advanced understanding of the genetic and biological mechanism involved in bone resorption has revealed new therapeutic targets for antiresorptive treatments. Several of these new drugs act by targeting specific pathways within the osteoclastic cells and may reduce bone resorption without a concomitant decrease in bone formation. Such an uncoupling may result in a net bone formation, thereby causing a bone "anabolic" effect through an antiresorptive mechanism. Moreover, in contrast to e.g., bisphosphonates several of the new drugs are not deposited within bone and therefore their duration of action is related to their presence in plasma. Accordingly, their antiresorptive effect is quickly reversible, which may be of advantages if reversal of a suppressed bone turnover is warranted under certain clinical conditions such as osteonecrosis of the jaw. In this paper, we will review the pharmacological properties and clinical effects of drugs that recently have been (denosumab, bazedoxifene, lasofoxifene), or currently are being tested in large phase III clinical trials (Catepsin K inhibitor), as well as drugs that have shown potential beneficial effects in phase I or II trials and may be tested in upcoming phase III trials (integrin antagonists, c-Src kinase inhibitor, inhibitors of the acidification process within the resorption lacuna, and glucagon-like peptide).
Insights
New antiresorptive drugs target specific bone resorption pathways, potentially enhancing bone formation. Unlike bisphosphonates, their effects are reversible, offering clinical advantages for conditions like osteonecrosis of the jaw.
Area of Science:
- Pharmacology
- Bone Biology
- Drug Development
Background:
- Bisphosphonates are traditional antiresorptive agents inducing osteoclast apoptosis.
- Advances in understanding bone resorption reveal new therapeutic targets.
- Novel drugs aim to uncouple bone resorption from formation, potentially yielding anabolic effects.
Purpose of the Study:
- To review pharmacological properties and clinical effects of emerging antiresorptive drugs.
- To discuss drugs recently approved or in late-stage clinical trials.
- To explore potential future therapies targeting specific bone resorption pathways.
Main Methods:
- Review of pharmacological properties of novel antiresorptive agents.
- Analysis of clinical effects from phase I, II, and III trials.
- Discussion of emerging therapeutic targets and drug classes.
Main Results:
- New drugs selectively target osteoclast pathways, reducing bone resorption without inhibiting bone formation.
- Reversible action of some new drugs offers advantages in managing bone turnover.
- Several drug classes, including denosumab and cathepsin K inhibitors, are in advanced clinical development.
Conclusions:
- Novel antiresorptive therapies offer improved efficacy and safety profiles compared to traditional agents.
- Targeted approaches promise to uncouple bone resorption and formation, potentially leading to net bone gain.
- Future research will focus on drugs targeting specific pathways like integrin antagonism and acidification inhibition.
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