Siriwan TANGYUENYONG, Siriporn PEANSUKMANEE, Siriwan ONGCHAI

Effect of sesamin on protection of equine articular cartilage degradation in vitro

Black sesame seed is a potential herbal medicine for osteoarthritis treatment as it contains sesamin, which has antiinflammatoryproperties and has demonstrated chondroprotective effects in many species. Horses are particularly susceptible to osteoarthritis.Inflammatory mediators and matrix metalloproteinase are important factors causing cartilage degradation. This study aimed toinvestigate the protective potential of sesamin (0.5–2.0 μM) against interleukin (IL)-1β-induced equine cartilage explant degradation.The cartilage degradation was monitored by measuring the release of cartilage matrix molecules in culture media including sulfatedglycosaminoglycansand hyaluronan by calorimetric assay and ELISA assay, respectively. The remaining contents of collagen and uronicacid (UA) within the explant tissue were assessed by hydroxyproline assay and UA assay, respectively. Cartilage-degrading enzymesMMP-2 and MMP-3 were evaluated by gelatin zymography and ELISA assay, respectively. The results indicated that sesamin suppressedIL-1β-induced equine cartilage degradation by reducing the levels of sulfated-glycosaminoglycans and hyaluronan, and preserving thecontents of UA and collagen within the explant tissues. The activity of MMP-2 and the quantity of MMP-3 were also suppressed bysesamin. The chondroprotective efficacy of sesamin was comparable to that of diacerein, an antiarthritic drug. Lactate dehydrogenaseassay showed that sesamin at concentrations of up to 2 mM did not cause cytotoxicity to chondrocytes in cartilage explants. These resultsmay lead to new options for osteoarthritis treatment in horses.

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