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Related Experiment Videos

A sensitive immunoassay for von Willebrand factor.

R E Benson1, J L Catalfamo, M Brooks

  • 1Wadsworth Center for Laboratories & Research, New York State Department of Health, Albany 12201-0509.

Journal of Immunoassay
|January 1, 1991
PubMed
Summary

A new ELISA assay accurately measures canine von Willebrand factor antigen (vWF:Ag) and is suitable for large-scale screening. This assay also detects human vWF:Ag, aiding in von Willebrand disease diagnosis.

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Area of Science:

  • Veterinary Diagnostics
  • Immunology
  • Biochemistry

Background:

  • von Willebrand factor (vWF) is crucial for hemostasis.
  • Accurate quantification of vWF:Ag is essential for diagnosing von Willebrand disease (vWD).
  • Existing assays for canine vWF:Ag have limitations in sensitivity or scalability.

Purpose of the Study:

  • To develop a sensitive and specific ELISA for canine von Willebrand factor antigen (vWF:Ag).
  • To evaluate the assay's cross-reactivity with vWF:Ag from other species, including humans.
  • To assess the assay's utility in diagnosing canine vWD and for large-scale screening.

Main Methods:

  • A modified double-sandwich ELISA was developed using polyclonal antibodies specific for canine vWF:Ag.
  • The assay's sensitivity and specificity were compared to existing methods.

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  • Commercially available antibodies to human vWF:Ag were also employed in the same assay configuration.

    • Main Results:

    • The developed ELISA is highly sensitive for canine vWF:Ag, comparable to radioimmunoassays and superior to human vWF:Ag ELISAs.
    • The assay demonstrates strong reactivity with human and other vertebrate vWF:Ag.
    • It accurately distinguishes Type III vWD and allows for single plasma dilution measurements across a wide vWF:Ag range.

    Conclusions:

    • The novel ELISA provides a sensitive, specific, and scalable method for canine vWF:Ag quantification.
    • The assay's cross-reactivity with human vWF:Ag enhances its diagnostic potential.
    • This assay is well-suited for large-scale screening programs and clinical diagnosis of canine vWD.