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We previously reported that a thienoindazole derivative TD-198946 (TD) induced chondrogenic differentiation in vitro without promoting hypertrophy, and prevented and repaired the degeneration of articular cartilage observed in a surgically induced mouse model of osteoarthritis (OA).1 In that study, the TD injections into mouse knee joints began on the day of the OA surgery (prevention model) or 4 weeks after the surgery (repair model), and continued periodically until 8 weeks after the surgery.1
Here we report the disease-modifying effects of TD injections on progressed OA in mice. We examined 4-week and 8-week injection protocols that began 8 weeks after the OA surgery (figure 1A). Eight mice in each group (n=8) were then subjected to histopathological assessments of knee joint OA. The severity of OA was quantified using the Osteoarthritis Research Society International histopathology scoring system (scale: 0–6)2 on histological sections stained with Safranin O/fast green. The OA surgery, preparation of TD, injection of TD into mouse knee joints and preparation of paraffin sections were performed as …
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