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Related Experiment Videos

Cell adhesion by membrane-bound paf-acether.

E Ninio1, S Leyravaud, J Bidault

  • 1INSERM U200, Clamart, France.

International Immunology
|November 1, 1991
PubMed
Summary
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Platelet-activating factor (PAF) on neutrophil surfaces mediates platelet aggregation through direct cell contact. This cell-surface PAF plays a role in immune and inflammatory responses.

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Platelet-activating factor (PAF) is known to be synthesized and partially cell-associated in various cell types.
  • The precise location and function of cell-associated PAF, particularly its external exposure, remained unclear.

Purpose of the Study:

  • To investigate the hypothesis that cell-associated PAF is exposed on the external plasma membrane of neutrophils.
  • To determine if this external PAF can exert biological functions, such as inducing platelet aggregation.

Main Methods:

  • Human polymorphonuclear neutrophils (PMN) were stimulated and washed.
  • Stimulated PMN were incubated with human or rabbit platelets.
  • PAF antagonists (BN 52021, WEB 2086) and anti-PAF antibodies were used to inhibit aggregation.

Related Experiment Videos

  • Microscopy was used to observe platelet-neutrophil interactions.

    • Main Results:

    • Stimulated PMN induced time- and dose-dependent platelet aggregation, which was inhibited by PAF antagonists and antibodies.
    • Platelet aggregates were observed attached to the neutrophil surface.
    • PAF remained associated with PMN after human PMN-human platelet interaction but decreased after human PMN-rabbit platelet incubation.

    Conclusions:

    • A fraction of PAF synthesized by neutrophils is located on the external plasma membrane.
    • This membrane-bound PAF can mediate biological functions, like platelet aggregation, via direct cell-to-cell contact.
    • This mechanism may be significant in cell adhesion, immune cell function, and inflammatory processes.