ArticleJournal of orthopaedic translation2026
Exercise alleviates age-related osteoarthritis associated with PGC-1α activation to suppress chondrocyte senescence and aberrant glycolysis.
Article in Journal of orthopaedic translation, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Age-related osteoarthritis (OA) is a leading global disability cause. Exercise is recommended as first-line therapy but poorly tolerated by elderly patients. This study elucidated the mechanism of low-intensity exercise in OA and develop a targeted exercise-mimetic nanotherapy. Methods: The effects of low-intensity swimming exercise on age-related OA were investigated using aged mouse models. A senescence-targeted nanoparticle system (NP-B2M) was fabricated via a double-emulsion solvent evaporation method combined with EDC/NHS conjugation. The mechanisms underlying exercise and PGC-1α-mediated metabolic reprogramming were explored using transcriptomic sequencing, glycolysis analysis, RT-qPCR, and Western blotting in IL-1β-induced senescent ATDC5 chondrocytes. The therapeutic efficacy of intra-articular delivery of NP-B2M was systematically evaluated using micro-CT, histological staining, and immunohistochemistry in aged mice. Results: Low-intensity swimming attenuated OA by suppressing chondrocyte senescence and pathological glycolysis via activating PGC-1α, effects that were recapitulated by ZLN005. NP-B2M enabled targeted intra-articular drug release and showed superior efficacy over free ZLN005. Conclusion: This study demonstrates that low-intensity exercise alleviates age-related OA via PGC-1α-mediated metabolic reprogramming. NP-B2M provides a biocompatible, precisely targeted, long-acting platform that mimics exercise benefits, offering promising translational potential as a precision therapeutic strategy for immobile elderly OA patients. The translational potential of this article: In this study, we developed NP-B2M, a PLGA-based nanoplatform, achieves prolonged joint retention and enhanced efficacy versus free drug, representing a promising targeted approach for OA patients with limited mobility.
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