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Related Experiment Videos

Histamine release by platelet aggregation.

P F Mannaioni1, B Palmerani, A Pistelli

  • 1Department of Preclinical and Clinical Pharmacology, University of Florence, Italy.

Agents and Actions
|April 1, 1990
PubMed
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Platelets release histamine when stimulated, which in turn boosts platelet aggregation. This suggests a platelet-derived histamine releasing factor and the presence of histamine receptors on platelets.

Area of Science:

  • Immunology
  • Hematology
  • Pharmacology

Background:

  • Mast cells and platelets interact, influencing immune responses.
  • Histamine plays a role in various physiological and pathological processes.
  • Platelet aggregation is a critical factor in thrombosis and hemostasis.

Purpose of the Study:

  • To investigate the interaction between rat mast cells and human platelets.
  • To determine the role of histamine in platelet aggregation.
  • To explore the presence and function of histamine receptors on platelets.

Main Methods:

  • Coincubation of rat serosal mast cells with human platelets.
  • Induction of platelet aggregation using arachidonic acid.
  • Assessment of histamine release and its effect on platelet aggregation.

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  • Pharmacological modulation of histamine effects using specific antagonists and agonists (PEA, mepyramine, ranitidine).

    • Main Results:

    • Coincubation induced significant histamine release from mast cells.
    • Histamine release increased dose-dependently with arachidonic acid-induced platelet aggregation.
    • Histamine enhanced platelet aggregation induced by various agonists.
    • Pyridyl-ethyl-amine (PEA) mimicked histamine's effect, mepyramine blocked it, and ranitidine amplified it.
    • Evidence for a platelet-derived histamine releasing factor (PDHRF) was found.

    Conclusions:

    • Platelets release histamine, which modulates platelet aggregation.
    • Platelets possess functional H1 and H2 histamine receptors.
    • A platelet-derived histamine releasing factor (PDHRF) likely exists.
    • These findings shed light on mast cell-platelet interactions and histamine's role in platelet function.