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Activated human platelets express beta2 integrin

M M Philippeaux1, C Vesin, F Tacchini-Cottier

  • 1Department of Pathology, University of Geneva, Switzerland.

European Journal of Haematology
|March 1, 1996
PubMed
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Activated human platelets express beta2 integrin molecules, enabling binding to CD54-expressing cells. This interaction is crucial for platelet function in immune responses.

Area of Science:

  • Immunology
  • Cell Biology
  • Hematology

Background:

  • Beta2 integrins (CD11a, CD11b, CD11c, CD18) are key cell adhesion molecules.
  • Their role on human platelets and megakaryocytic cell lines requires further elucidation.

Purpose of the Study:

  • To investigate the expression of beta2 integrin family molecules on human megakaryocytic cell lines and platelets.
  • To determine the functional significance of beta2 integrin expression on activated platelets.

Main Methods:

  • Immunofluorescence and flow cytometry were employed.
  • A comprehensive panel of monoclonal antibodies (mAbs) was utilized.
  • Platelet activation was induced using thrombin.

Main Results:

Related Experiment Videos

  • Beta2 integrin molecules (CD11a, CD11b, CD11c, CD18) were detected on megakaryocytic cell lines (DAMI, HEL).
  • Resting platelets showed low, variable expression of CD11a, CD11b, and CD18, which increased significantly upon thrombin activation.
  • Activated platelets demonstrated binding to CD54-expressing cells (RAJI line), inhibited by anti-CD11a, anti-CD18, and anti-CD54 mAbs.

    • Conclusions:

    • Human platelets express beta2 integrin molecules upon activation.
    • Activated platelets can bind to CD54-bearing cells via beta2 integrins, suggesting a role in cell-cell interactions.