von Willebrand Factor multimers profiling with a semi-automated system

Area of Science:

• Hematology
• Clinical Chemistry
• Biochemistry

Background:

• Von Willebrand disease (vWD) diagnosis relies on assessing plasma von Willebrand factor (vWF) concentration and function.
• Phenotypic testing, specifically multimer pattern analysis, is crucial for classifying hereditary and acquired vWD subtypes.
• Current multimer analysis is technically challenging, time-consuming (3-4 days), and performed in limited specialized laboratories.

Purpose of the Study:

• To develop a rapid, sensitive, and semi-automated method for visualizing vWF multimeric structure.
• To standardize and simplify the technical difficulties associated with vWF multimer analysis.
• To reduce the turnaround time for vWF multimer testing.

Main Methods:

• Developed a semi-automated electrophoresis technique for patient plasma vWF.
• Utilized precast gels compatible with G26 Interlab instrumentation for 120-minute electrophoresis.
• Employed gel blotting for direct visualization of vWF multimer patterns on a membrane.

Main Results:

• Significantly reduced the total assay time from 72 hours to 8 hours.
• Achieved sensitive visualization of vWF multimeric structures.
• The method is suitable for routine laboratory use and standardization.

Conclusions:

• The developed semi-automated method offers a faster and more accessible approach to vWF multimer analysis.
• This technique can overcome technical challenges and reduce assay duration.
• Proposed for first-level screening of von Willebrand factor multimer deficiency.