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Gene
Expression in Murine Tissue Macrophages
Department of Pathology, Duke University Medical Center, Durham,
North Carolina 27710
Aspirin has been reported to inhibit the activation of nuclear
factor-
B (NF-
B) through stabilization of inhibitor
B (I
B). This observation led us to investigate the role of aspirin in suppressing the activation of the NF-
B-regulated tumor necrosis factor-
(TNF-
) gene expression in primary macrophages. We now report that therapeutic doses of aspirin suppress
lipopolysaccharide-inducible NF-
B binding to an NF-
B
binding site in the TNF-
promoter, lipopolysaccharide-induced TNF-
mRNA accumulation, and protein secretion. I
B is also stabilized under these conditions. The aspirin-initiated stabilization of I
B, suppression of induced TNF-
mRNA, and NF-
B binding to the TNF-
promoter are blocked by pretreatment with pertussis toxin. These studies suggest that aspirin may exert significant anti-inflammatory effects by suppressing the production of macrophage-derived inflammatory mediators.
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