Involvement of interleukin-1 receptor-associated kinase (IRAK)-M in toll-like receptor (TLR) 7-mediated tolerance in RAW 264.7 macrophage-like cells

Ferdaus Hassan, Shamima Islam, Gantsetseg Tumurkhuu, Jargalsaikhan Dagvadorj, Yoshikazu Naiki, Takayuki Komatsu, Naoki Koide, Tomoaki Yoshida, Takashi Yokochi

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19 Citations (Scopus)

Abstract

The effect of toll-like receptor (TLR) 7 ligand pretreatment on the production of tumor necrosis factor (TNF)-α in response to TLR7 or TLR2 ligand was examined in order to establish a new TLR-mediated tolerance. RAW 264.7 macrophage-like cells were treated with imiquimod R837 as a TLR7 ligand for 18 h, washed and incubated in fresh culture medium 6 h. The second challenge with imiquimod R837 as a TLR7 ligand or Pam3CysSK4 as a TLR2 ligand resulted in reduced TNF-α production in TLR7 ligand-pretreated cells. There was impaired activation of NF-κB, p38 and stress-activated protein kinase (SAPK) in the tolerant cells. The expression of IRAK-M as a negative regulator of TLR signaling was markedly augmented in the tolerant cells while the interleukin-1 receptor-associated kinase (IRAK)-1 functioned normally. The involvement of IRAK-M in the TLR7-mediated tolerance is discussed.

Original languageEnglish
Pages (from-to)99-103
Number of pages5
JournalCellular Immunology
Volume256
Issue number1-2
DOIs
Publication statusPublished - 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Immunology

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