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Related Experiment Videos

Factor VIII procoagulant antigen in human tissues.

N Kadhom1, C Wolfrom, M Gautier

  • 1Unités 56, Institut National de la Santé et de la Recherche Médicale, Le Kremlin-Bicêtre, France.

Thrombosis and Haemostasis
|April 8, 1988
PubMed
Summary

This study investigated the presence of factor VIII procoagulant antigen (VIII:Ag) and factor VIII von Willebrand antigen (VWF:Ag) in various human organs. Findings suggest the liver is a primary storage site, but the lung and placenta may also significantly contribute to Factor VIII levels.

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Area of Science:

  • Hematology
  • Immunohistochemistry
  • Cell Biology

Background:

  • Factor VIII (F VIII) is crucial for hemostasis.
  • Understanding the tissue localization of F VIII antigens (VIII:Ag and VWF:Ag) is important for comprehending its production and release.
  • Previous research points to the liver as a key site, but other organs' roles require further investigation.

Purpose of the Study:

  • To investigate the localization of factor VIII procoagulant antigen (VIII:Ag) and factor VIII von Willebrand antigen (VWF:Ag) in human liver, lung, spleen, placenta, and umbilical cord.
  • To compare the distribution and intensity of these antigens across different tissues.
  • To evaluate the potential contribution of non-hepatic tissues to circulating Factor VIII levels.

Main Methods:

  • Immunoperoxidase technique utilizing an avidin biotin complex (ABC) was employed.

Related Experiment Videos

  • Tissue samples from human liver, lung, spleen, placenta, and umbilical cord were analyzed.
  • Specific antibodies were used to detect VIII:Ag and VWF:Ag.

    • Main Results:

    • Both VIII:Ag and VWF:Ag were detected in the endothelial cells of vascular structures in all investigated organs.
    • Liver endothelial cells showed positive staining for VIII:Ag, consistent with a storage role.
    • Notably, lung and placenta exhibited bright staining for both VIII:Ag and VWF:Ag, indicating potential substantial contributions.
    • VIII:Ag was also found in the cytoplasm of dysplastic hepatocytes in one liver sample.

    Conclusions:

    • Liver endothelial cells are confirmed as a major site for Factor VIII storage and release.
    • The significant presence of VIII:Ag and VWF:Ag in lung and placenta suggests these organs are also substantial sources of Factor VIII.
    • Further research is warranted to elucidate the precise roles of the lung and placenta in Factor VIII homeostasis.