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Phospholipid Binding Protein C Inhibitor (PCI) Is Present on Microparticles Generated In Vitro and In Vivo.

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Protein C inhibitor is found on circulating microparticles, primarily from megakaryocytes. Its presence on these vesicles does not significantly impact coagulation but suggests interactions with complement system proteins.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Immunology

Background:

  • Protein C inhibitor is a serine protease inhibitor that binds anionic phospholipids.
  • Anionic phospholipids are exposed on microparticles derived from activated or apoptotic cells.
  • Microparticles are vesicles released from cell membranes, carrying various proteins.

Purpose of the Study:

  • To investigate the presence and role of protein C inhibitor on circulating microparticles.
  • To determine if microparticle-bound protein C inhibitor affects coagulation.
  • To identify potential binding partners of protein C inhibitor on microparticles.

Main Methods:

  • Flow cytometry to detect protein C inhibitor on microparticles.
  • Western blots, ELISAs, and mass spectrometry to confirm presence in plasma.
  • Protease inhibition assays and co-precipitation to assess function and interactions.

Main Results:

  • Protein C inhibitor is incorporated into microparticles during cell membrane blebbing and is abundant on circulating plasma microparticles.
  • Heparin partially removed protein C inhibitor, indicating binding to phospholipids.
  • Microparticle-bound protein C inhibitor did not inhibit activated protein C or thrombin.
  • Complement factor 3 was a prominent co-precipitating protein.

Conclusions:

  • Microparticle-associated protein C inhibitor does not appear to play a major role in coagulation.
  • The findings suggest a potential interaction between protein C inhibitor and the complement system on microparticles.