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is a pivotal transcription factor involved in the activation of the TNF-alpha and IL-1beta genes. Activation of NF-kappaB in synovial cells is a feature seen in arthritis patients. Resveratrol, a polyphenolic, natural phytoalexin found with particularly high levels in grape skin and red wine is potent and specific inhibitor of TNF-alpha and IL-1beta induced NF-kappaB activation. We aimed to determine the in vivo effects of intra-articular injections of resveratrol on cartilage and synovium in an experimental rabbit inflammatory arthritis model.
Arthritis was induced by intra-articular injection of three times of 50 mug lipopolysaccharide (LPS) at day 0, 4 and 8 at 4-day intervals into the knee joints of rabbits. To the test group, 10 muMol/kg resveratrol in the DMSO was injected in the knees at day 0 and then it was continued once daily for 2 weeks. To the control group the same time and amount of DMSO was injected the knees of rabbits. All rabbits were killed 1 week after the last injection and cartilage tissue and synovium were evaluated with semiquantitative scoring histologically.
According to control group in the resveratrol group, significantly decreased cartilage destruction was determined by H&E staining (p = 0.04). Loss of matrix proteoglycan content in the cartilage was much lower, as determined by safranin O staining (p = 0.03). We also observed marked synovial inflammation after intra-articular injection to control knees, but not in the resveratrol treated group knees (p = 0.01).
This study suggests that intra-articular injection of resveratrol may protect cartilage against the development of experimentally induced IA.
Article Produced By
Department of Orthopaedics and Traumatology, Inönü University Medical Faculty, 44069 Malatya, Turkey
https://www.ncbi.nlm.nih.gov/pubmed/17115116
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