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Related Experiment Videos

Microbubble-induced serotonin secretion in human platelets.

R Malmgren1, T Thorsen, R T Lie

  • 1Department of Experimental Surgery, Karolinska Institute, Stockholm, Sweden.

Thrombosis and Haemostasis
|April 8, 1991
PubMed
Summary
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Nitrogen microbubbles cause platelet aggregation and serotonin secretion, but non-adhering platelets are not activated by autocrine stimulation. Platelet aggregation and secretion are complex responses to microbubble exposure.

Area of Science:

  • Biomedical research
  • Hematology
  • Physiology

Background:

  • Nitrogen (N2) microbubbles can induce platelet aggregation, similar to known platelet agonists.
  • Platelet activation and secretion are critical in hemostasis and thrombosis.

Purpose of the Study:

  • To investigate the effect of N2 microbubbles on platelet secretion of preloaded 14C-serotonin.
  • To determine the relationship between microbubble-induced platelet aggregation and serotonin secretion.

Main Methods:

  • Platelet-rich plasma was stirred with N2 microbubbles.
  • Platelet aggregation and 14C-serotonin secretion were measured over time.
  • The effects of acetylsalicylic acid (ASA) and epinephrine were evaluated.

Main Results:

Related Experiment Videos

  • Platelet secretion increased after 20 minutes of microbubble exposure, coinciding with 40% aggregation.
  • No correlation was found between secreted serotonin levels and the degree of platelet aggregation.
  • Acetylsalicylic acid (ASA) inhibited secretion but only marginally reduced aggregation.
  • Epinephrine enhanced microbubble-induced aggregation and secretion, effects that ASA could not fully prevent.

Conclusions:

  • Non-adhering platelets in the bulk phase are not activated via autocrine stimulation by dense granule material.
  • Microbubble-induced platelet activation involves complex mechanisms beyond simple aggregation.