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Aim: Loss of glycosaminoglycan (GAG) chains isa typical pathological change of osteoarthritis (OA).Here, effects of Angelica sinensis polysaccharides (ASPs) on GAG synthesis in chondrocytes and the mechanism were studied.Methods: OA Wistar rats orally treated with ASPs (25 mg/kg per day) for 5 weeks were sacrificed for the knee to detect GAG content by Safranin O stain, histopathological changes by Mankins scoring, and protein expression of UDP-sugar synthetases and glycosyl transferases (GTs) involved in GAG synthesis by immunohistochemistry.