Salicylic acid and aspirin inhibit the activity of RSK2 kinase and repress RSK2-dependent transcription of cyclic AMP response element binding protein- and NF-κB-responsive genes

Mary Ann Stevenson, Mei Juan Zhao, Alexzander Asea, C. Norman Coleman, Stuart K. Calderwood

Research output: Contribution to journalArticlepeer-review

Abstract

Sodium salicylate (NaSal) and other nonsteroidal anti-inflammatory drugs (NSAIDs) coordinately inhibit the activity of NF-κB, activate heat shock transcription factor 1 and suppress cytokine gene expression in activated monocytes and macrophages. Because our preliminary studies indicated that these effects could be mimicked by inhibitors of signal transduction, we have studied the effects of NSAIDs on signaling molecules potentially downstream of LPS receptors in activated macrophages. Our findings indicate that ribosomal S6 kinase 2 (RSK2), a 90-kDa ribosomal S6 kinase with a critical role as an effector of the RAS-mitogen-activated protein kinase pathway and a regulator of immediate early gene transcription is a target for inhibition by the NSAIDs. NSAIDs inhibited the activity of purified RSK2 kinase in vitro and of RSK2 in mammalian cells and suppressed the phosphorylation of RSK2 substrates cAMP response element binding protein (CREB) and I-κBα in vivo. Additionally, NaSal inhibited the phosphorylation by RSK2 of CREB and I-κBα on residues crucial for their transcriptional activity in vivo and thus repressed CREB and NF-κB-dependent transcription. These experiments suggest that RSK2 is a target for NSAIDs in the inhibition of monocyte-specific gene expression and indicate the importance of RSK2 and related kinases in cell regulation, indicating a new area for anti-inflammatory drug discovery.

Original languageEnglish (US)
Pages (from-to)5608-5616
Number of pages9
JournalJournal of Immunology
Volume163
Issue number10
StatePublished - Nov 15 1999

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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