Related Experiment Videos

Fungal pathogen recognition by scavenger receptors in nematodes and mammals

Terry K Means1

  • 1Center for Immunology and Inflammatory Diseases and Division of Rheumatology, Allergy and Immunology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, USA. tmeans@partners.org

Virulence
|December 24, 2010
PubMed

Insights

Scavenger receptors SCARF1 and CD36 are crucial for host defense against fungal infections. These receptors mediate fungal pathogen engulfment and enhance Toll-like receptor 2 signaling for immunity.

Area of Science:

  • Immunology
  • Microbiology
  • Cell Biology

Background:

  • Macrophages are key immune cells for fungal infection resistance.
  • Fungal recognition by macrophages initiates phagocytosis, cytokine release, and adaptive immunity.
  • The full spectrum of fungal recognition receptors and signaling pathways remains incompletely understood.

Purpose of the Study:

  • To identify and characterize receptors involved in host defense against fungal pathogens.
  • To elucidate the role of specific scavenger receptors in anti-fungal immunity.
  • To expand upon previous findings regarding SCARF1 and CD36 in Cryptococcus neoformans infection.

Main Methods:

  • RNA interference (RNAi) screen in C. elegans.
  • Identification of conserved receptors mediating fungal pathogen defense.
  • Analysis of mammalian orthologues SCARF1 and CD36.
  • Investigation of their role in Cryptococcus neoformans interaction.

Main Results:

  • The C. elegans receptors CED-1 and C03F11.3 were identified as important for fungal defense.
  • Mammalian orthologues, scavenger receptors SCARF1 and CD36, were found to mediate host defense against Cryptococcus neoformans.
  • SCARF1 and CD36 act as co-receptors, facilitating fungal pathogen engulfment and Toll-like receptor 2 signaling.

Conclusions:

  • SCARF1 and CD36 are critical components of the innate immune system's response to fungal infections.
  • These scavenger receptors play a dual role in pathogen recognition and signal transduction.
  • Understanding these mechanisms can inform strategies to combat fungal diseases.

Related Concept Videos

Defenses Against Pathogens and Herbivores02:26

Defenses Against Pathogens and Herbivores

Plants present a rich source of nutrients for many organisms, making it a target for herbivores and infectious agents. Plants, though lacking a proper immune system, have developed an array of constitutive and inducible defenses to fend off these attacks.
29.4K
Fungal Phylum Microsporidia01:28

Fungal Phylum Microsporidia

Microsporidia are a group of obligate intracellular fungi that were initially classified as protists but were later reclassified based on phylogenetic, molecular, and structural evidence linking them to the Chytridiomycota. These unicellular, non-motile organisms are highly specialized parasites that infect a wide range of animal hosts, including humans. They have evolved extensive genomic and metabolic reductions, making them highly dependent on their hosts for survival.Morphology and Genomic...
333
Immune Surveillance by NK Cells and Phagocytes01:25

Immune Surveillance by NK Cells and Phagocytes

Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
Natural Killer Cells: The Fast Responders
NK cells are large granular lymphocytes found in the blood and lymphatic system. These...
7.7K
Receptor-mediated Endocytosis01:39

Receptor-mediated Endocytosis

Overview
110.1K
Cells of the Innate Immune Response01:28

Cells of the Innate Immune Response

The innate immune response is an immediate and non-specific response against pathogens, acting swiftly to prevent the spread of infections. The primary cells involved in this response are phagocytes and natural killer (NK) cells.
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
8.4K
Antigen Processing Pathways01:31

Antigen Processing Pathways

MHC molecules are key players in the immune response, enabling T cells to recognize and respond to specific antigens. They are present on the surface of all nucleated cells in the body and are instrumental in presenting antigens to T cells and activating them. T cells recognize the MHC-antigen complex and initiate an immune response. MHC class I and MHC class II are two main types of MHC molecules, each associated with a distinct antigen processing pathway.
MHC Class I: Presenting Endogenous...
2.0K