sPLA2 inhibitor-loaded nanoparticles mitigate spontaneous osteoarthritis in guinea pigs

In female Dunkin-Hartley guinea pigs with spontaneous age-related osteoarthritis, sPLA2i-NPs from 3 months significantly attenuated cartilage destruction, synovitis, and osteophyte formation at 7 and 10 months.

• Why it matters: Osteoarthritis lacks disease-modifying therapies, and while sPLA2 is implicated in OA, its therapeutic potential in age-related spontaneous disease is unclear.
• What they did: The study tracked age-dependent increases in cartilage degeneration, synovitis, oxidative stress, and sPLA2 expression/activity, then tested thioetheramide-PC-loaded nanoparticles versus free inhibitor in IL-1β cartilage explants and in vivo via intra-articular dosing.
• The result: sPLA2i-NPs normalized anabolic/catabolic gene expression and reduced synovial fluid sPLA2 activity, preserved gait metrics (limb loading, propulsion, locomotion), and showed no systemic toxicity after long-term treatment.

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