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Chemokine production and pattern recognition receptor (PRR) expression in whole blood stimulated with

Anne-Sophie W Møller1, Reidun Ovstebø, Kari Bente F Haug

  • 1The Research and Development Group, Department of Clinical Chemistry, Ullevaal University Hospital, N-0450 Oslo, Norway. a.s.w.moller@medisin.uio.no

Cytokine
|January 13, 2006
PubMed

Insights

Pathogen-associated molecular patterns (PAMPs) stimulate chemokine production in whole blood, primarily by monocytes. Antibodies targeting pattern recognition receptors (PRRs) like CD14 and TLRs can inhibit this response to varying degrees.

Area of Science:

  • Immunology
  • Microbiology

Background:

  • Pathogen-associated molecular patterns (PAMPs) are conserved microbial structures recognized by pattern recognition receptors (PRRs).
  • PAMP recognition can trigger the expression of early immediate genes, including chemokines involved in immune responses.

Purpose of the Study:

  • To investigate the induction of chemokines MIP-1alpha, MCP-1, and IL-8 by various PAMPs in an ex vivo whole blood model.
  • To determine the cellular sources of these chemokines and the role of specific PRRs in PAMP-mediated responses.

Main Methods:

  • Whole blood was stimulated with different PAMPs, including lipopolysaccharide (LPS) from E. coli and N. meningitidis, lipoteichoic acid (LTA), and lipoarabinomannan (AraLAM).
  • Chemokine levels were measured over time using techniques such as ELISA.
  • Cell depletion studies were performed to identify chemokine-producing cells.
  • Antibodies against CD14, TLR2, and TLR4 were used to block PRR signaling.
  • Expression levels of CD14, TLR2, and TLR4 were analyzed on monocytes.

Main Results:

  • Escherichia coli-LPS induced rapid and significant production of MIP-1alpha and IL-8 within 1 hour, while MCP-1 elevation occurred after 3 hours.
  • MIP-1alpha reached peak concentrations 3-5 fold higher than MCP-1 and IL-8.
  • Monocytes were the primary source of all three chemokines, although IL-8 mRNA was also detected in granulocytes.
  • Antibodies against CD14 and TLR4 significantly inhibited chemokine production induced by E. coli-LPS and N. meningitidis-LPS.
  • Antibodies against CD14 and TLR2 showed less efficacy in blocking chemokine production induced by LTA and AraLAM.
  • PAMP stimulation led to a dose-dependent increase in CD14, TLR2, and TLR4 expression on monocytes.

Conclusions:

  • PAMPs effectively induce chemokine production in whole blood.
  • Monocytes are key players in PAMP-induced chemokine release.
  • Specific PRRs, including CD14, TLR2, and TLR4, are crucial for mediating PAMP responses, with varying degrees of involvement depending on the PAMP type.
  • Targeting PRRs offers potential for modulating inflammatory responses in infectious conditions.

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