Key Takeaways
- Knee arthrofibrosis is a serious complication most commonly seen after knee surgeries, as well as in osteoarthritis
- Excessive extracellular matrix deposition, joint stiffness, and loss of mobility characterize this condition
- Dysregulated interactions between macrophages and fibroblasts establish self-perpetuating fibrotic loops
- Emerging therapies target key mediators and signaling pathways, including HIF-1α, NPTI, Hippo, and Wnt
Knee arthrofibrosis is a serious and debilitating complication that can arise after anterior cruciate ligament (ACL) reconstruction or total knee arthroplasty, as well as a part of the pathology of knee osteoarthritis. This condition is characterized by excessive deposition of extracellular matrix, leading to joint stiffness and severe loss of mobility.
Unraveling the Cellular and Molecular Mechanisms
While fibrosis has been extensively studied in other organs, such as the liver, lung, and heart, knee joint fibrosis remains largely overlooked, with no approved therapies or ongoing clinical trials targeting its underlying mechanisms. This review provides a comprehensive overview of the key cellular and molecular pathways driving pathological fibrosis in the knee joint.
The review highlights the critical role of dysregulated interactions between macrophages and fibroblasts, which establish self-perpetuating fibrotic loops. It also delves into the most important mediators and signaling pathways involved, including the enzymes lysyl oxidase, transglutaminase-2, and matrix metalloproteinases, which contribute to the formation of the fibrotic tissue.
Promising Therapeutic Strategies
The review also provides an overview of the latest drug candidates under clinical investigation for other fibrotic conditions, while proposing potential directions for druggable targets specifically related to knee joint arthrofibrosis. These include hypoxia-inducible factor 1-alpha (HIF-1α), nuclear protein 1 (NPTI), the Hippo signaling pathway, and the Wnt signaling pathway.
Importantly, the review also highlights the potential of innovative local (intra-articular) drug delivery systems, such as micro- and nanoparticles, hydrogels, and extracellular vesicles, to improve the effectiveness of targeted therapies for knee arthrofibrosis.
Advancing our understanding of the knee-specific fibrotic mechanisms is crucial for developing effective, mechanism-driven treatments to restore joint mobility and improve the quality of life for patients suffering from this debilitating condition.
When healing turns fibrotic: Exploring molecular mechanisms and therapeutic strategies for knee arthrofibrosis.
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