The molecular mechanism of inhibition of interleukin-1 beta-induced cyclooxygenase-2 expression in human synovial cells by Tripterygium wilfordii Hook F extract

Citation
K. Maekawa et al., The molecular mechanism of inhibition of interleukin-1 beta-induced cyclooxygenase-2 expression in human synovial cells by Tripterygium wilfordii Hook F extract, INFLAMM RES, 48(11), 1999, pp. 575-581
Citations number
41
Categorie Soggetti
Immunology
Journal title
INFLAMMATION RESEARCH
ISSN journal
10233830 → ACNP
Volume
48
Issue
11
Year of publication
1999
Pages
575 - 581
Database
ISI
SICI code
1023-3830(199911)48:11<575:TMMOIO>2.0.ZU;2-#
Abstract
Objective: Several extracts of Tripterygium wilfordii Hook F (TWHF) have be en reported to be effective in patients with rheumatoid arthritis. We inves tigated the effect of multi-glycosides of TWHF (GTW), a TWHF extract, on in terleukin (TL)-1 beta-stimulated human rheumatoid synovial cells. Materials and Methods. IL-1 beta-stimulated synovial cells were used to detect the e ffects of GTW on cyclooxygenase (COX)-1 and COX-2 activities, expression of COX protein and mRNA, and nuclear transcription factors in experiments usi ng respective reporter plasmids. Results: GTW inhibited prostaglandin E-2 production by IL-1 beta-stimulated synovial cells in a concentration-dependent manner, and also inhibited COX -2 protein and mRNA expression in a similar fashion to dexamethasone. Howev er, GTW did not act as a glucocorticoid agonist. GTW repressed IL-1 beta-in duced nuclear factor-kappa B activity, but did not have a significant influ ence on activating protein-1 activity. Conclusion: The anti-rheumatic effect of GTW or TWHF may be partly mediated through the inhibition of prostaglandin E-2 production in human synovial c ells due to suppression of COX-2 mRNA, possibly via inhibition of nuclear f actor-kappa B activity.