Abstract
To explore the role of an adipokine-termed fatty acid-binding protein 4 (FABP4) in osteoarthritis (OA). Patients with primary knee OA and non-OA controls were included. Paired tissues including plasma, synovial fluid (SF), subcutaneous fat and infrapatellar fat pad (IPFP) were harvested during surgery. FABP4 concentration was determined by ELISA. Plasma FABP4 increased significantly with OA stage (n=263). OA patients (n=38) had significantly higher plasma and SF FABP4 than non-OA patients (n=29). FABP4 level of IPFP was positively correlated with SF FABP4. OA patients had significantly high systemic and local FABP4, and IPFP may be the main source of FABP4 in synovial cavity. FABP4 may be a promising biomarker for OA.
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