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Platelets contain releasable coagulation factor IX antigen

K G Romp1, D M Monroe, M Hoffman

  • 1Department of Pathology, Durham Veterans Affairs Medical Center, NC 27705.

Blood Coagulation & Fibrinolysis : an International Journal in Haemostasis and Thrombosis
|December 1, 1993
PubMed
Summary
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Human platelets store coagulation factor IX within alpha granules. Upon activation, platelets release this factor IX, potentially contributing to hemostasis and coagulation processes.

Area of Science:

  • Hematology
  • Cell Biology
  • Hemostasis

Background:

  • Platelets internalize plasma proteins into alpha granules.
  • Platelet activation triggers the release of alpha granule contents.

Purpose of the Study:

  • To investigate the presence of coagulation factor IX in human platelet alpha granules.
  • To determine if factor IX is released upon platelet activation.

Main Methods:

  • Immunofluorescence microscopy of activated and unactivated platelets.
  • Indirect immunofluorescence staining for factors V and IX.
  • Immunoelectron microscopy for precise localization of factor IX.

Main Results:

  • Unactivated platelets showed finely granular staining for factor IX.

Related Experiment Videos

  • Factor IX was localized in alpha granules, cytoplasm, and vesicles.
  • Platelet activation led to the release of factor IX into the open canalicular system.

    • Conclusions:

    • Human platelets contain factor IX, primarily in alpha granules.
    • Platelet activation releases factor IX, suggesting a role in coagulation.
    • The physiological significance of platelet factor IX in hemostasis warrants further investigation.