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Related Experiment Videos

Histamine release from rabbit platelets by platelet-activating factor (PAF)

K Nakahodo1, S Saitoh, M Nakamura

  • 1Department of Physiology, School of Medicine, University of The Ryukyus.

Arerugi = [Allergy]
|March 1, 1994
PubMed
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Platelet-activating factor (PAF) activates rabbit platelets, causing them to release adenosine triphosphate (ATP) and histamine. PAF antagonists partially inhibit this histamine release, suggesting PAF-platelet interactions influence allergic reactions.

Area of Science:

  • Immunology
  • Hematology
  • Pharmacology

Background:

  • Platelet-activating factor (PAF) is a potent lipid mediator involved in inflammatory and allergic responses.
  • Platelets play a crucial role in hemostasis and thrombosis, and increasingly recognized for their involvement in immune modulation.

Purpose of the Study:

  • To investigate if PAF activates rabbit platelets, leading to adenosine triphosphate (ATP) release.
  • To determine if activated platelets release histamine.
  • To assess the efficacy of PAF antagonists in inhibiting histamine release from platelets.

Main Methods:

  • Washed rabbit platelets were incubated with varying concentrations of PAF.
  • Platelet aggregation and ATP release were measured.
  • PAF-activated platelets were sonicated, centrifuged, and the supernatant tested for histamine-induced guinea pig ileum contraction.

Related Experiment Videos

  • Inhibition of aggregation and histamine release was assessed using PAF antagonists CV-3988 and CV-6209.

    • Main Results:

    • PAF induced dose-dependent platelet aggregation and ATP release, with maximal aggregation (~70%) and ATP release (1.6 x 10(-5) M) observed at 3.4 x 10(-7) M PAF.
    • Supernatants from PAF-aggregated platelets caused guinea pig ileum contraction, inhibited by antihistamines, indicating histamine release (3.7 µg/ml).
    • CV-3988 (10(-5) M) inhibited PAF-induced aggregation by 35% and histamine release by 50%. CV-6209 (5 x 10(-7) M) inhibited aggregation by 35% and histamine release by ~30%.

    Conclusions:

    • PAF activates rabbit platelets, leading to the release of both ATP and histamine.
    • Histamine released from PAF-activated platelets may contribute to the modulation of allergic reactions.
    • A direct relationship between PAF and platelets is suggested in the context of allergic processes.