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Cattle-FRETS71, a novel fluorogenic substrate with broad applicability for characterizing ADAMTS13 properties and

John Cameron Barton1, Cooper Anderson2, Frida Z Miranda3

  • 1Oklahoma State University College of Osteopathic Medicine, Tulsa, Oklahoma, USA.

Journal of Thrombosis and Haemostasis : JTH
|August 26, 2023
PubMed
Summary
This summary is machine-generated.

The Cattle-FRETS71 assay effectively measures ADAMTS13 activity in human plasma, showing strong correlation with existing methods for diagnosing thrombotic thrombocytopenic purpura (TTP). This versatile assay aids research and clinical applications.

Keywords:
ADAMTS13TTPanimal modelsenzyme assaysvon Willebrand factor

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Area of Science:

  • Biochemistry
  • Hematology
  • Clinical Diagnostics

Background:

  • Current ADAMTS13 activity assays are crucial for diagnosing thrombotic thrombocytopenic purpura (TTP) but have limitations in animal models.
  • The Cattle-FRETS71 assay shows promise for detecting ADAMTS13 activity across various animal species, potentially benefiting all research stages.

Purpose of the Study:

  • To evaluate the Cattle-FRETS71 assay's performance against established human assays (FRETS-rVWF71, FRETS-VWF73) in human plasma and serum.
  • To validate the Cattle-FRETS71 assay's utility for diagnosing TTP in patients.

Main Methods:

  • Internal validation involved 81 heparinized plasma samples.
  • External validation used 118 blinded serum samples from the Oklahoma TTP Registry, previously assayed with FRETS-VWF73.
  • Additional validation included 32 citrated plasma samples with variable ADAMTS13 activities analyzed by FRETS-VWF73.

Main Results:

  • Excellent correlation (r=0.94) was observed between Cattle-FRETS71 and FRETS-rVWF71 in heparinized plasma.
  • Comparably good correlations (r=0.81 and r=0.85) were found between Cattle-FRETS71 and FRETS-VWF73 for TTP Registry serum and citrated plasma samples, respectively.

Conclusions:

  • The Cattle-FRETS71 assay demonstrates comparable performance to existing assays for quantifying ADAMTS13 activity in human plasma from TTP patients.
  • Its versatility, specificity, and sensitivity make Cattle-FRETS71 a valuable tool for standardizing ADAMTS13 activity measurements in both basic and clinical research.