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Related Experiment Videos

CD44 mediates polymorphonuclear leukocyte motility on hyaluronan.

Khalil A Aziz1

  • 1Regional Department of Immunology, Birmingham Heartlands Hospital, Bordesley Green East, Birmingham, B9 5SS, United Kingdom. khalil.aziz@heartsol.wmids.nhs.uk

Saudi Medical Journal
|August 27, 2003
PubMed
Summary

Polymorphonuclear leukocytes migrate on hyaluronan via CD44. Interleukin-8 inhibits this migration, suggesting a role in host defense. This study reveals key interactions in the extracellular matrix.

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Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Polymorphonuclear (PMN) leukocytes are crucial for host defense.
  • Hyaluronan (HA) is a key component of the extracellular matrix.
  • Chemokines like Interleukin-8 (IL-8) regulate immune cell behavior.

Purpose of the Study:

  • To investigate PMN leukocyte behavior on HA.
  • To determine the role of IL-8 in PMN migration on HA.
  • To identify the cell surface receptors involved in PMN-HA interaction.

Main Methods:

  • PMN isolation from human blood.
  • Time-lapse video microscopy of PMN on HA-coated plates with and without IL-8.
  • Use of blocking and non-blocking antibodies against CD44 and RHAMM to identify mediating receptors.

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Main Results:

  • Approximately 55% of PMN migrated on HA, with a mean speed of 6.4 mm/min.
  • IL-8 significantly reduced PMN migration percentage (7.5%) and speed (2.0 mm/min).
  • Blocking CD44 antibodies reduced PMN speed to 2.5 mm/min, indicating CD44's role.

Conclusions:

  • PMN leukocytes utilize CD44 to interact and migrate on HA.
  • IL-8 modulates PMN migration on HA, potentially optimizing host defense.
  • This study elucidates a novel mechanism of PMN-extracellular matrix interaction.