Manipulation of distinct NFkappaB proteins alters interleukin-1beta-induced human rheumatoid synovial fibroblast prostaglandin E2 formation.

The Journal of Biological Chemistry
A K RoshakL A Marshall

Abstract

Interleukin 1beta (IL-1beta) up-regulates human rheumatoid synovial fibroblast (RSF) 85-kDa phospholipase A2 (PLA2) and mitogen-inducible cyclooxygenase (COX) II. Promoter regions for these genes contain a motif that closely resembles the "classic" NFkappaB consensus site. Immunoblot analysis identified NFkappaB1 (p50), RelA (p65), and c-Rel in RSF. Upon IL-1beta-stimulation, p65 and c-Rel but not p50 protein levels were reduced suggesting nuclear translocation. IL-1beta-induced RSF nuclear extracts contained a p65-containing complex, which bound to the classical NFkappaB consensus motif. An NFkappaB classical oligonucleotide decoy produced a concentration-dependent decrease in IL-1-stimulated PGE2 production (IC50 = approximately 2 microM), indicating a role of NFkappaB. Utilization of antisense technology showed that p65 but not p50 or c-Rel mediated IL-1beta-stimulated PGE2 formation. Treated RSF could not transcribe COX II or 85-kDa PLA2 mRNA, which reduced their respective proteins. Interestingly, stimulated IL-8 production was not inhibited by the classical NFkappaB decoy but was reduced by treatment with antisense to both p65 and c-Rel supporting preferential binding of c-Rel-p65 to the "alternative" IL-8 kappaB motif. T...Continue Reading

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