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Related Experiment Videos

Toll-like receptors stimulate human neutrophil function.

Fumitaka Hayashi1, Terry K Means, Andrew D Luster

  • 1Center for Immunology and Inflammatory Diseases, Massachusetts General Hospital, Boston, USA.

Blood
|June 28, 2003
PubMed
Summary

Neutrophils, the first immune responders, utilize Toll-like receptors (TLRs) to detect pathogens and initiate microbicidal functions. This study details TLR expression and functional responses in human neutrophils, revealing their role in innate immunity.

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Neutrophils are the primary immune cells at infection sites, initiating microbicidal functions to contain pathogens.
  • Pathogen detection in neutrophils relies on germ line-encoded receptors, notably Toll-like receptors (TLRs).

Purpose of the Study:

  • To determine the expression profile of Toll-like receptors (TLRs) in human neutrophils.
  • To investigate the functional consequences of TLR activation in neutrophils.

Main Methods:

  • Isolated human neutrophils were analyzed for TLR expression using quantitative polymerase chain reaction (QPCR).
  • Neutrophils were stimulated with various TLR agonists, and responses such as cytokine release, superoxide generation, and phagocytosis were measured.
  • The effect of granulocyte-macrophage colony-stimulating factor (GM-CSF) on TLR expression and function was assessed.

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Main Results:

  • Human neutrophils express TLR1, 2, 4, 5, 6, 7, 8, 9, and 10, but not TLR3.
  • GM-CSF treatment upregulated TLR2 and TLR9 expression.
  • TLR activation triggered cytokine release, superoxide generation, L-selectin shedding, and enhanced phagocytosis, while inhibiting chemotaxis to IL-8.
  • GM-CSF pretreatment was required for optimal TLR9 agonist response and enhanced responses to other TLR agonists.
  • TLR-stimulated neutrophils exhibited a chemokine profile suggesting recruitment of innate immune cells.

Conclusions:

  • Human neutrophils express a broad range of functional TLRs, excluding TLR3.
  • TLR signaling in neutrophils modulates key effector functions crucial for innate immune responses.
  • TLR-stimulated neutrophils primarily recruit innate immune cells, highlighting their role in early infection control.