Mannose Binding Lectin Enhances IL-1beta and IL-10 Induction by Non-Lipopolysaccharide (LPS) Components of Neisseria Meningitidis

Cytokine. 2004 Oct 21;28(2):59-66. doi: 10.1016/j.cyto.2004.06.007.

Abstract

Mannose binding lectin (MBL) is a key molecule in the lectin pathway of complement activation, and likely of importance in our innate defence against meningococcal infection. We evaluated the role of MBL in cytokine induction by LPS or non-LPS components of Neisseria meningitidis, using a meningococcal mutant deficient for LPS. Binding experiments showed that MBL exhibited low, but significant binding to encapsulated LPS+ meningococci (H44/76) and LPS-deficient (LPS-) meningococci (H44/76lpxA). Experiments with human mononuclear cells (PBMCs) showed that MBL significantly augmented IL-1beta production after stimulation with LPS+ and LPS- meningococci, in a dose-dependent fashion. In addition, IL-10 production was enhanced after stimulation with LPS- meningococci. In contrast, TNFalpha, IL-6 and IFNgamma productions were unaffected. No effect of MBL was observed on cytokine induction by meningococcal LPS. MBL enhanced cytokine production at concentrations >10(7) meningococci. It is concluded that MBL interacts with non-LPS components of N. meningitidis and in this way modulates the cytokine response.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cells, Cultured
  • Humans
  • Interferon-gamma / biosynthesis
  • Interleukin-1 / biosynthesis*
  • Interleukin-10 / biosynthesis*
  • Interleukin-6 / biosynthesis
  • Leukocytes, Mononuclear / immunology
  • Leukocytes, Mononuclear / metabolism*
  • Leukocytes, Mononuclear / microbiology
  • Lipopolysaccharides
  • Mannose-Binding Lectin / blood
  • Mannose-Binding Lectin / metabolism*
  • Neisseria meningitidis / chemistry*
  • Neisseria meningitidis / genetics
  • Neisseria meningitidis / metabolism*
  • Tumor Necrosis Factor-alpha / biosynthesis
  • Up-Regulation*

Substances

  • Interleukin-1
  • Interleukin-6
  • Lipopolysaccharides
  • Mannose-Binding Lectin
  • Tumor Necrosis Factor-alpha
  • Interleukin-10
  • Interferon-gamma