NF-κB-mediated expression of MAPK phosphatase-1 is an early step in desensitization to TLR ligands in enterocytes

J. Wang, H. R. Ford, A. V. Grishin

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

Toll-like receptor (TLR) signaling in naive enterocytes is rapidly inhibited, leading to the establishment of tolerance. To gain insight into tolerance at the level of the proinflammatory mitogen-activated protein kinase (MAPK) p38, we characterized TLR-mediated induction of the p38-specific phosphatase MKP-1. In cultured enterocytes, ligands of TLR3, TLR4, TLR5, and TLR9, but not TLR2, induce MKP-1 at 30-60 min, coincident with dephosphorylation of p38 following the peak of TLR ligand-induced phosphorylation. Induction of MKP-1 is blocked by inhibitors of nuclear factor (NF)-B, but not of MAPK. Small interfering RNA knockdown of IkBα prolongs the expression of MKP-1. Rat MKP-1 promoter contains two NF-B-binding sites, mutations in which additively impair lipopolysaccharide-induced transcription from the MKP-1 promoter. In the intestine, MKP-1 is expressed in the crypts, the epithelial compartment that also displays bacteria-dependent activating phosphorylation of p38. Thus, NF-B-dependent expression of MKP-1 may contribute, by desensitization of p38, to the rapid establishment of unresponsiveness to several TLR ligands in enterocytes.

Original languageEnglish (US)
Pages (from-to)523-534
Number of pages12
JournalMucosal Immunology
Volume3
Issue number5
DOIs
StatePublished - Sep 1 2010
Externally publishedYes

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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