This study aimed to evaluate the anti-inflammatory activity of the combination of Vahl. and Roxb. (AC) extract in monosodium iodoacetate (MIA)-induced osteoarthritis (OA) rat model. AC was administered orally to OA rats (240, 480, and 960 mg/kg bw) for three weeks. The control and model groups comprised OA rats treated with diclofenac sodium and carrier, respectively. AC-treated rats exhibited a significant reduction in oedema volume compared to those of the model group (p < 0.05). Notably, AC, at 960 mg/kg bw, significantly decreased inflammatory cytokines TNF-α and IL-1β, along with matrix metalloproteinase-9 (MMP-9) levels compared to those of the model group (p < 0.05). AC's attenuation of OA progression was also observed through haematoxylin and eosin (H&E) and Safranin O-fast green analysis. A phytochemical study showed AC contained phenolic, flavonoid, curcumin, demethoxycurcumin, and bisdemethoxycurcumin compounds. This study concludes that AC alleviated OA progression through anti-inflammatory effects and depressed MMP-9 levels.
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