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Plasmodium falciparum infection causes proinflammatory priming of human TLR responses

Matthew B B McCall1, Mihai G Netea, Cornelus C Hermsen

  • 1Department of Medical Microbiology, Radboud University Nijmegen Medical Center, 6500 HB Nijmegen, The Netherlands.

Journal of Immunology (Baltimore, Md. : 1950)
|June 21, 2007
PubMed

Insights

Toll-like receptor (TLR) responses in humans shift towards pro-inflammatory cytokine production during Plasmodium falciparum malaria. This TLR priming by malaria is unique among pathogens and may predict disease severity.

Area of Science:

  • Immunology
  • Infectious Diseases
  • Malariology

Background:

  • Toll-like receptors (TLRs) are key pattern recognition receptors initiating innate immunity.
  • Plasmodium falciparum (P.f.) ligands are recognized by TLRs, influencing immune responses.
  • Understanding TLRs' role in acute malaria is crucial for immune response modulation.

Purpose of the Study:

  • To investigate Toll-like receptor (TLR) responses during acute experimental Plasmodium falciparum infection.
  • To characterize TLR-4, TLR-2, and TLR-1 responses in malaria-naive volunteers.
  • To assess the prognostic value of TLR responses for clinical inflammatory parameters.

Main Methods:

  • Ex vivo whole blood stimulation assays with Plasmodium falciparum (P.f.) antigens.
  • Measurement of pro-inflammatory and anti-inflammatory cytokine production (e.g., TNF-alpha, IL-10).
  • In vitro preincubation of peripheral blood mononuclear cells (PBMCs) with P.f. antigens followed by TLR stimulation.

Main Results:

  • TLR-4 responses showed significantly increased pro-inflammatory cytokine production during P.f. infection.
  • TLR-2/TLR-1 responses increased both pro-inflammatory and anti-inflammatory cytokines.
  • Early pro-inflammatory TLR responses correlated with subsequent clinical inflammatory parameters.
  • P.f. preincubation enhanced subsequent TLR-4 and TLR-2 responses, increasing TNF-alpha and reducing IL-10.

Conclusions:

  • Plasmodium falciparum infection primes human TLR responses towards a pro-inflammatory cytokine profile.
  • This priming effect is unique compared to other microbial pathogens.
  • TLR responses during malaria may serve as a prognostic indicator for disease severity.

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