Nickel allergy-promoting effects of microbial or inflammatory substances at the sensitization step in mice

Harue Takahashi, Masayuki Kimbara, Naoki Sato, Keiichi Sasaki, Shunji Sugawara, Yasuo Endo

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Microbial components stimulate innate immunity via Toll-like receptors (TLRs), nucleotide-binding oligomerization domain (NOD)-like receptors (NLRs), and/or IL-1. We recently reported that in mice, Escherichia coli lipopolysaccharide (LPS, TLR4-ligand) promotes allergic responses to nickel (Ni) at both the sensitization and elicitation steps. Here, we examined in mice the effects of administering other microbial or inflammatory materials at the Ni-sensitization step. A mixture of 1 mM NiCl 2 and a test solution was injected into BALB/c mice intraperitoneally (0.1 ml/10 g body weight), and 10 days later 5 mM NiCl 2 was challenged intradermally into the ear pinnas of the mice (20 μl/ear). The following preparations or substances exhibited adjuvant activities: Prevotella intermedia LPS, Saccharomyces cerevisiae mannan, a synthetic muramyl dipeptide (NOD2-stimulating cell-wall component of bacteria), Pam 3Cys-SKKKK (TLR2-stimulating synthetic peptide), poly I:C (TLR3-stimulating double-stranded RNA), concanavalin A (a typical T-cell mitogen and T-cell-mediated hepatitis-inducer), heat-killed Propionibacterium acnes (Gram-positive bacterium that causes pimples and induces macrophage-mediated experimental hepatitis), and nitrogen-containing bisphosphonates (chemicals stimulating IL-1 production). Unexpectedly, P. intermedia LPS, which displayed the most potent adjuvant activity among the tested preparations, was effective in TLR4-dysfunctional mutant mice, but not in TLR2-deficient mice, whereas the reverse was true for S. cerevisiae mannan. These results suggest that (i) for the establishment of Ni-allergy in mice, stimulation of innate immunity (including TLRs, NLRs, IL-1 production, and/or other factors) may be important at the sensitization step, and (ii) P. intermedia may produce a substance(s) that potently promotes Ni-allergy via stimulation of TLR2.

Original languageEnglish
Pages (from-to)1534-1540
Number of pages7
JournalInternational Immunopharmacology
Volume11
Issue number10
DOIs
Publication statusPublished - 2011 Oct 1

Keywords

  • Adjuvant
  • Allergy
  • Infection
  • Innate immunity
  • Nickel

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Pharmacology

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