Abstract
Osteoarthritis (OA), the most common of all arthropathies, is a leading cause of disability and has a large (and growing) worldwide socioeconomic cost. Despite its burgeoning importance, translation of disease-modifying OA therapies from the laboratory into clinical practice has slowed. Differences between the OA models studied preclinically and the disease evaluated in human clinical trials contribute to this failure. Most animal models of OA induce disease through surgical or mechanical disruption of joint biomechanics in young individuals rather than the spontaneous development of age-associated disease. This instability-induced joint disease in animals best models the arthritis that develops in humans after an injurious event, known as post-traumatic OA (PTOA). Studies in genetically modified mice suggest that PTOA has a distinct molecular pathophysiology compared with that of spontaneous OA, which might explain the poor translation from preclinical to clinical OA therapeutic trials. This Review summarizes the latest data on potential molecular targets for PTOA prevention and modification derived from studies in genetically modified mice, and describes their validation in preclinical therapeutic trials. This article focuses on how these findings might best be translated to humans, and identifies the potential challenges to successful implementation of clinical trials of disease-modifying drugs for PTOA.
Key Points
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The translational value of animal models is primarily determined by how well they correspond with the human condition, and major improvements might be achieved by aligning preclinical and clinical disease
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Preclinical research and drug development primarily uses models of post-traumatic osteoarthritis (OA) in young individuals; its molecular pathophysiology could be different than the age-associated OA most commonly targeted in clinical trials
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Post-traumatic OA in mice is a valid model of the human disease, and using genetically engineered strains has identified disease-modifying targets that have been validated in preclinical therapeutic studies
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Issues remain in study design for therapeutic clinical trials of post-traumatic OA, and the development of predictive biomarkers is critical to drug development for this common and costly disease
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Acknowledgements
The authors acknowledge generous funding support for direct research costs and salaries for research personnel, received in grants from the National Institutes of Health, National Health and Medical Research Council of Australia, the Australian Research Council, Arthritis Australia, and the University of Sydney.
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Both authors contributed equally to researching data, reviewing the literature, discussing content, writing and revising the article.
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C. Little declares that he has received honoraria from AMGEN, Fidia Farmaceutici, and Pfizer, and has received research support from Fidia Farmaceutici, Eli Lilly and Pfizer. D. Hunter declares that he holds or has applied for a patent with DonJoy.
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Little, C., Hunter, D. Post-traumatic osteoarthritis: from mouse models to clinical trials. Nat Rev Rheumatol 9, 485–497 (2013). https://doi.org/10.1038/nrrheum.2013.72
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DOI: https://doi.org/10.1038/nrrheum.2013.72
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