The anti-inflammatory agents aspirin and salicylate inhibit the activity of I(kappa)B kinase-beta.

NF-kappaB comprises a family of cellular transcription factors that are involved in the inducible expression of a variety of cellular genes that regulate the inflammatory response. NF-kappaB is sequestered in the cytoplasm by inhibitory proteins, I(kappa)B, which are phosphorylated by a cellular kinase complex known as IKK. IKK is made ...
up of two kinases, IKK-alpha and IKK-beta, which phosphorylate I(kappa)B, leading to its degradation and translocation of NF-kappaB to the nucleus. IKK kinase activity is stimulated when cells are exposed to the cytokine TNF-alpha or by overexpression of the cellular kinases MEKK1 and NIK. Here we demonstrate that the anti-inflammatory agents aspirin and sodium salicylate specifically inhibit IKK-beta activity in vitro and in vivo. The mechanism of aspirin and sodium salicylate inhibition is due to binding of these agents to IKK-beta to reduce ATP binding. Our results indicate that the anti-inflammatory properties of aspirin and salicylate are mediated in part by their specific inhibition of IKK-beta, thereby preventing activation by NF-kappaB of genes involved in the pathogenesis of the inflammatory response.
Mesh Terms:
Adenosine Triphosphate, Animals, Anti-Inflammatory Agents, Non-Steroidal, Aspirin, Binding, Competitive, COS Cells, Chloramphenicol O-Acetyltransferase, Enzyme Activation, Enzyme Inhibitors, Gene Expression Regulation, HeLa Cells, Humans, I-kappa B Kinase, Jurkat Cells, NF-kappa B, Phosphorylation, Protein-Serine-Threonine Kinases, Sodium Salicylate, Transfection, Tumor Necrosis Factor-alpha
Nature
Date: Nov. 05, 1998
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