Osteoarthritis is a frequently occurring joint disorder in veterinary practice. Current treatments are focused on pain and inflammation; however, these are not able to reverse the pathological condition. Mesenchymal stem cells (MSCs) could provide an interesting alternative because of their immunomodulatory properties. The objective of this study was to evaluate the potential of a single intravenous (IV) injection of xenogeneic equine peripheral blood-derived MSCs (epbMSCs) as treatment for articular pain and lameness. Patients with chronic articular pain were injected intravenously with epbMSCs. They were evaluated at three time points (baseline and two follow-ups) by a veterinarian based on an orthopedic joint assessment and an owner canine brief pain inventory scoring. Thirty-five dogs were included in the safety and efficacy evaluation of the study. Results showed that the epbMSC therapy was well tolerated, with no treatment-related adverse events and no increase in articular heat or pain. A significant improvement in lameness, range of motion, joint effusion, pain severity, and interference scores was found 6 weeks post-treatment compared with baseline. This study demonstrates that future research on IV administration of epbMSCs is warranted to further explore its possible beneficial effects in dogs with chronic articular pain and lameness. Clinical Trial gov ID: EC_2018_002.
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