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Related Experiment Videos

Factor V Quebec revisited

C M Janeway1, G E Rivard, P B Tracy

  • 1Department of Biochemistry, University of Vermont, College of Medicine, Burlington 05404-0068, USA.

Blood
|May 1, 1996
PubMed
Summary
This summary is machine-generated.

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Factor V Quebec disorder, a bleeding condition, involves defective platelet factor V. This study reveals a generalized defect causing degradation of alpha-granule proteins in platelets.

Area of Science:

  • Hematology
  • Molecular Biology
  • Genetics

Background:

  • Factor V Quebec is an autosomal dominant bleeding disorder causing severe bleeding post-trauma.
  • Previous studies noted mild thrombocytopenia and defective platelet factor V in affected individuals.
  • Plasma factor V is near normal and functional, suggesting a platelet-specific issue.

Purpose of the Study:

  • To reevaluate patients with Factor V Quebec disorder following reports of multimerin deficiency.
  • To investigate the underlying molecular defect causing the bleeding diathesis.
  • To determine the integrity of alpha-granule proteins in affected platelets.

Main Methods:

  • Western blot analysis of platelet lysates.
  • Use of monoclonal antibodies to detect specific proteins.

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  • Comparative analysis between affected individuals and controls (implied).

    • Main Results:

    • Alpha-granule proteins (fibrinogen, von Willebrand factor, factor V, osteonectin) were decreased and degraded in patient platelets.
    • Thrombospondin was decreased but not degraded.
    • Platelet factor 4 and beta-thromboglobulin levels were unaffected.
    • Platelet alpha-granules appear to be assembled correctly but their contents undergo degradation.

    Conclusions:

    • Factor V Quebec disorder is associated with a generalized defect leading to the degradation of most alpha-granule proteins.
    • The bleeding diathesis likely stems from the absence of functional platelet factor V due to this degradation.
    • This defect impacts multiple proteins within platelet alpha-granules, not just factor V.