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Related Experiment Videos

Platelet imipramine binding is increased in essential thrombocythaemia.

S Jackson1, P M Ellis, R Beeston

  • 1Department of Haematology, Wellington Hospital, Private Bag, New Zealand.

Blood Coagulation & Fibrinolysis : an International Journal in Haemostasis and Thrombosis
|October 1, 1992
PubMed
Summary

Platelet serotonin levels decrease in myeloproliferative disorders. However, imipramine binding sites, related to serotonin transport, unexpectedly increased in patients with essential thrombocythaemia, suggesting a complex relationship.

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Area of Science:

  • Hematology
  • Neuroscience
  • Pharmacology

Background:

  • Decreased platelet serotonin content is a known characteristic of myeloproliferative disorders.
  • The underlying cause for reduced platelet serotonin in these conditions remains unclear.
  • Platelet serotonin levels are influenced by serotonin transporters in the platelet membrane.

Purpose of the Study:

  • To investigate the relationship between reduced platelet serotonin and serotonin transport channels.
  • To indirectly assess serotonin transport by measuring imipramine binding sites on platelets.
  • To explore these relationships in patients with essential thrombocythaemia and polycythaemia rubra vera.

Main Methods:

  • Determined imipramine binding parameters in 12 patients with essential thrombocythaemia or polycythaemia rubra vera.

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  • Compared findings with 10 healthy controls.
  • Measured the maximal number of imipramine binding sites (Bmax) as an indicator of serotonin transporter availability.

    • Main Results:

    • Maximal imipramine binding sites (Bmax) were elevated in both patient groups compared to controls.
    • This increase was statistically significant in patients with essential thrombocythaemia.
    • Observed a discrepancy: reduced platelet serotonin content alongside increased imipramine binding in essential thrombocythaemia.

    Conclusions:

    • The study reveals an unexpected increase in imipramine binding sites on platelets from essential thrombocythaemia patients, contrasting with decreased serotonin content.
    • This finding challenges the direct correlation between serotonin levels and transporter numbers in these disorders.
    • Further research into imipramine binding sites, serotonin content, and uptake in myeloproliferative disorders is warranted.