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Variable recognition of Candida albicans strains by TLR4 and lectin recognition receptors

Mihai G Netea1, Neil A R Gow, Leo A B Joosten

  • 1Department of Medicine, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands. m.netea@aig.umcn.nl

Medical Mycology
|February 20, 2010
PubMed

Insights

Lectin receptor recognition of Candida albicans is consistent across strains, unlike Toll-like receptor 4 (TLR4) recognition. This suggests lectin receptors are more critical for in vivo antifungal defense than TLR4.

Area of Science:

  • Immunology
  • Microbiology
  • Infectious Diseases

Background:

  • The role of Toll-like receptor 4 (TLR4) in recognizing Candida albicans is debated.
  • Discrepancies in literature may stem from variations in C. albicans strain recognition.

Purpose of the Study:

  • To investigate if different C. albicans strains are recognized differently by TLR4 and lectin receptors.
  • To assess the relative importance of TLR4 and lectin receptors in host defense against C. albicans.

Main Methods:

  • Evaluated recognition of 14 different C. albicans isolates by TLR4 and lectin receptors.
  • Utilized TLR4 knockout (TLR4-/-) mice to assess in vivo susceptibility to C. albicans strains.
  • Correlated in vitro recognition data with in vivo experimental outcomes.

Main Results:

  • Lectin receptor recognition of C. albicans cell wall structures was consistent across all tested strains.
  • TLR4 recognition of C. albicans varied significantly depending on the strain.
  • TLR4-/- mice showed increased susceptibility to a TLR4-recognized C. albicans strain but not to a strain independent of TLR4 recognition.

Conclusions:

  • Lectin receptors provide a stable recognition mechanism for C. albicans, irrespective of strain.
  • TLR4 recognition of C. albicans is strain-dependent and less consistent.
  • In vivo antifungal host defense relies more heavily on lectin receptors than TLRs, aligning with clinical observations in MyD88/TLR or dectin-1/CARD9 deficient individuals.

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