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Live-cell Video Microscopy of Fungal Pathogen Phagocytosis
08:52

Live-cell Video Microscopy of Fungal Pathogen Phagocytosis

Published on: January 9, 2013

Candida-host cell receptor-ligand interactions

Scott G Filler1

  • 1St Johns Cardiovascular Research Center, Division of Infectious Diseases, Department of Medicine, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Torrance, CA 90502, USA. sfiller@ucla.edu

Current Opinion in Microbiology
|July 14, 2006
PubMed

Insights

Host receptor interactions with Candida species are crucial for candidiasis pathogenesis. Recognition by Toll-like receptors and lectins influences immune responses and fungal clearance.

Area of Science:

  • Immunology
  • Microbiology
  • Mycology

Background:

  • Candida species interactions with host receptors are central to candidiasis pathogenesis.
  • Recognition of Candida albicans by Toll-like receptors (TLRs) 2 and 4 on mononuclear leukocytes impacts regulatory T-cell activity and cytokine balance.
  • Macrophages recognize different Candida forms via surface lectins.

Purpose of the Study:

  • To elucidate the role of host-pathogen interactions in Candida infections.
  • To understand how immune cells recognize and respond to different Candida species.
  • To investigate the mechanisms regulating fungal adhesin expression.

Main Methods:

  • Analysis of Candida species recognition by host immune cells.
  • Investigation of Toll-like receptor and lectin involvement in immune responses.
  • Comparison of adhesin gene regulation in Candida albicans and Candida glabrata.

Main Results:

  • Candida albicans recognition by TLR2 and TLR4 influences T-cell responses and cytokine profiles, modulating innate and adaptive antifungal immunity.
  • Different Candida forms are differentially recognized by macrophage lectins.
  • Candida albicans expresses agglutinin-like sequence (ALS) adhesins, while Candida glabrata expresses epithelial adhesin (EPA) adhesins.
  • EPA expression in C. glabrata is regulated by sub-telomeric silencing, distinct from ALS regulation in C. albicans.

Conclusions:

  • Host receptor interactions are critical determinants of the immune response to Candida infections.
  • Differential recognition mechanisms contribute to the varying pathogenesis of candidiasis.
  • Distinct regulatory mechanisms for adhesin expression in C. albicans and C. glabrata highlight species-specific adaptations.

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