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Updated: Feb 11, 2026

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The ITIM Domain-Containing NK Receptor Ly49Q Impacts Pulmonary Infection by Mediating Neutrophil Functions

Andreas Margraf1, Stephanie Volmering1, Jennifer Skupski1

  • 1Department of Anesthesiology, Intensive Care and Pain Medicine, University Hospital Muenster, University of Muenster, Muenster 48149, Germany.

Journal of Immunology (Baltimore, Md. : 1950)
|May 2, 2018
PubMed

Insights

Ly49Q receptor is crucial for neutrophil recruitment during pulmonary infections. Its deficiency impairs immune cell movement and defense against bacteria like Klebsiella pneumoniae.

Area of Science:

  • Immunology
  • Cell Biology
  • Microbiology

Background:

  • Pulmonary infections often involve excessive neutrophil infiltration.
  • The Ly49Q receptor, found on leukocytes, influences neutrophil migration and polarization.

Purpose of the Study:

  • To investigate the role of Ly49Q in the leukocyte adhesion cascade during pulmonary infection.
  • To elucidate the mechanisms by which Ly49Q regulates neutrophil function and immune response.

Main Methods:

  • Murine model of Klebsiella pneumoniae-induced pulmonary infection.
  • In vivo and in vitro assays to assess neutrophil migration, adhesion, and transmigration.
  • Structure-function analysis of Ly49Q domains.

Main Results:

  • Ly49Q deficiency reduced neutrophil rolling velocity, crawling, and transmigration.
  • Overactivation of neutrophil β2 integrins (Mac-1, LFA-1) in Ly49Q-deficient mice led to impaired immune defense.
  • Specific domains of Ly49Q were identified as critical for its function.

Conclusions:

  • Ly49Q is essential for regulating integrin activation and neutrophil recruitment during pulmonary infections.
  • Ly49Q plays a vital role in mounting an adequate immune response against Klebsiella pneumoniae.

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