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Platelet multielemental composition, lability, and subcellular localization

R Gorodetsky1, X Mou, A Blankenfeld

  • 1Sharett Institute of Oncology, Hadassah University Hospital, Jerusalem, Israel.

American Journal of Hematology
|March 1, 1993
PubMed
Summary
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Human platelets contain significant amounts of potassium, calcium, and zinc. Diagnostic X-ray spectrometry revealed zinc is primarily located in alpha-granules and cytoplasm, impacting platelet function.

Area of Science:

  • Hematology
  • Biochemistry
  • Analytical Chemistry

Background:

  • Human platelets play crucial roles in hemostasis and thrombosis.
  • Elemental composition of platelets, particularly zinc, is not fully understood.
  • Understanding platelet elemental distribution is key to platelet physiology.

Purpose of the Study:

  • To quantitate elemental composition of human platelets.
  • To determine the subcellular localization of potassium, calcium, and zinc in platelets.
  • To investigate the relationship between zinc distribution and platelet function.

Main Methods:

  • Diagnostic X-ray spectrometry (DXS) was employed for elemental quantitation.
  • Sucrose gradient ultracentrifugation was used to isolate subcellular fractions.

Related Experiment Videos

  • Electron microscopy and specific markers identified subcellular components.

    • Main Results:

    • Platelets contain significant levels of potassium (3.08 mg/g), calcium (1.18 mg/g), and zinc (35 µg/g).
    • Zinc levels in platelets are 30-60 fold higher than in plasma.
    • Zinc is distributed in alpha-granules (40%) and cytoplasm (60%), while calcium and potassium are in dense granules and cytoplasm, respectively.

    Conclusions:

    • Platelets are a significant reservoir for essential elements like zinc.
    • Subcellular localization of zinc suggests a role in platelet activation and release reactions.
    • DXS is a valuable tool for elemental analysis in biological samples like platelets.