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Related Experiment Videos

Vitronectin in clotting factor IX concentrates.

D Josic1, C Kannicht, K Löster

  • 1Octapharma Pharmazeutika Produktionsges m.b.H., Wien, Austria. djuro.josic@octapharma.at

Haemophilia : the Official Journal of the World Federation of Hemophilia
|May 31, 2001
PubMed
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Plasma-derived factor IX (FIX) concentrates contain multimeric vitronectin impurity. Methods like nanofiltration or size-exclusion chromatography can remove this protein, which requires further physiological investigation.

Area of Science:

  • Biochemistry
  • Protein purification
  • Biotechnology

Background:

  • Plasma-derived factor IX (FIX) concentrates are crucial therapeutics.
  • Current purification methods, including anion exchange and heparin affinity chromatography, leave residual accompanying proteins.
  • Vitronectin, an adhesive glycoprotein, is identified as a major impurity in these FIX concentrates.

Purpose of the Study:

  • To identify and characterize impurities in highly purified, plasma-derived factor IX (FIX) concentrates.
  • To investigate the form of vitronectin present in FIX concentrates.
  • To evaluate methods for removing vitronectin from FIX concentrates and discuss implications for therapeutic use.

Main Methods:

  • Anion exchange chromatography
  • Heparin affinity chromatography

Related Experiment Videos

  • Nanofiltration with a crossflow system
  • Size-exclusion chromatography

    • Main Results:

    • Vitronectin is the main accompanying protein impurity in FIX concentrates.
    • Vitronectin exists exclusively in its multimeric form in FIX concentrates, unlike in plasma.
    • Both nanofiltration and size-exclusion chromatography effectively remove multimeric vitronectin.

    Conclusions:

    • Multimeric vitronectin is a significant impurity in plasma-derived FIX concentrates.
    • Effective removal methods, such as nanofiltration and size-exclusion chromatography, are available.
    • The physiological impact of administering multimeric vitronectin to patients requires further investigation, and its removal is recommended.