Cutting edge: TLR2-deficient and MyD88-deficient mice are highly susceptible to Staphylococcus aureus infection

J Immunol. 2000 Nov 15;165(10):5392-6. doi: 10.4049/jimmunol.165.10.5392.

Abstract

Toll-like receptor (TLR) family acts as pattern recognition receptors for pathogen-specific molecular patterns. We previously showed that TLR2 recognizes Gram-positive bacterial components whereas TLR4 recognizes LPS, a component of Gram-negative bacteria. MyD88 is shown to be an adaptor molecule essential for TLR family signaling. To investigate the role of TLR family in host defense against Gram-positive bacteria, we infected TLR2- and MyD88-deficient mice with Staphylococcus aureus. Both TLR2- and MyD88-deficient mice were highly susceptible to S. aureus infection, with more enhanced susceptibility in MyD88-deficient mice. Peritoneal macrophages from MyD88-deficient mice did not produce any detectable levels of cytokines in response to S. aureus. In contrast, TLR2-deficient macrophages produced reduced, but significant, levels of the cytokines, and TLR4-deficient macrophages produced the same amounts as wild-type cells, indicating that S. aureus is recognized not only by TLR2, but also by other TLR family members except for TLR4.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adaptor Proteins, Signal Transducing
  • Animals
  • Antigens, Differentiation / genetics*
  • Antigens, Differentiation / physiology
  • Down-Regulation / genetics
  • Down-Regulation / immunology
  • Drosophila Proteins*
  • Genetic Predisposition to Disease*
  • Hot Temperature
  • Immunity, Innate / genetics
  • Interleukin-6 / biosynthesis
  • Macrophages, Peritoneal / immunology
  • Macrophages, Peritoneal / metabolism
  • Membrane Glycoproteins / deficiency*
  • Membrane Glycoproteins / genetics*
  • Membrane Glycoproteins / physiology
  • Mice
  • Mice, Inbred C57BL
  • Mice, Inbred Strains
  • Mice, Knockout
  • Myeloid Differentiation Factor 88
  • Receptors, Cell Surface / deficiency*
  • Receptors, Cell Surface / genetics*
  • Receptors, Cell Surface / physiology
  • Receptors, Immunologic*
  • Staphylococcal Infections / genetics*
  • Staphylococcal Infections / immunology*
  • Staphylococcal Infections / mortality
  • Staphylococcus aureus / immunology*
  • Survival Analysis
  • Toll-Like Receptor 2
  • Toll-Like Receptor 4
  • Toll-Like Receptors
  • Tumor Necrosis Factor-alpha / biosynthesis

Substances

  • Adaptor Proteins, Signal Transducing
  • Antigens, Differentiation
  • Drosophila Proteins
  • Interleukin-6
  • Membrane Glycoproteins
  • Myd88 protein, mouse
  • Myeloid Differentiation Factor 88
  • Receptors, Cell Surface
  • Receptors, Immunologic
  • Toll-Like Receptor 2
  • Toll-Like Receptor 4
  • Toll-Like Receptors
  • Tumor Necrosis Factor-alpha