Abstract
The objective of this study was to examine the effects of (−)-epigallocatechin-3-gallate (EGCG) on cyclooxygenase 2 (COX-2), prostaglandin E2 (PGE2), and interleukin 8 (IL-8) expression induced by IL-1β in human synovial fibroblasts. Cells were enzymatically isolated from synovial tissue taken from patients undergoing joint replacement surgery for osteoarthritis. Reverse transcriptase-polymerase chain reaction, immunocytochemistry, and western blotting were used to assess the COX-2 gene and protein expression with the associated mechanisms. PGE2 and IL-8 secretion into the culture medium was assayed by enzyme-linked immunosorbent assay. COX-2 upregulation in synovial fibroblasts induced by IL-1β was significantly suppressed by EGCG in a dose-dependent manner. PGE2 and IL-8 secretion was also induced by IL-1β stimulation and significantly suppressed by EGCG. The mechanism was associated with the phosphorylation of IKKβ. EGCG may inhibit the expression of inflammatory mediators, such as COX-2, PGE2, and IL-8, induced by IL-1β in human synovial fibroblasts. EGCG may be of value in the treatment of synovial inflammation.
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This work was supported by the National Science Council (NSC97-2320-B-016-009-MY3), National Defense Medical Center (DOD96-13-01), and Tri-Service General Hospital, Taiwan (TSGH-C96-1-S04).
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Huang, GS., Tseng, CY., Lee, CH. et al. Effects of (−)-epigallocatechin-3-gallate on cyclooxygenase 2, PGE2, and IL-8 expression induced by IL-1β in human synovial fibroblasts. Rheumatol Int 30, 1197–1203 (2010). https://doi.org/10.1007/s00296-009-1128-8
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DOI: https://doi.org/10.1007/s00296-009-1128-8