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Pig complement regulator factor H: molecular cloning and functional characterization.

Guido A Hegasy1, Ute Willhoeft, Sandra A Majno

  • 1Bernhard Nocht Institute for Tropical Medicine, Bernhard-Nocht-Strasse 74, 20359 Hamburg, Germany.

Immunogenetics
|October 1, 2003
PubMed
Summary
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Researchers cloned and characterized pig Factor H, a key complement regulator. This fluid-phase regulator shares functional similarities with human Factor H, crucial for xenotransplantation research.

Area of Science:

  • Immunology
  • Biochemistry

Background:

  • The complement system is vital for innate immunity, with Factor H regulating the alternative pathway.
  • Pigs are a potential source for xenotransplantation, but their fluid-phase complement regulators remain uncharacterized.

Purpose of the Study:

  • To clone, express, and functionally characterize pig Factor H.
  • To assess its potential role in xenotransplantation compatibility.

Main Methods:

  • Full-length pig Factor H cDNA was isolated from a liver cDNA library.
  • Deletion constructs (SCR 1-4, SCR 15-20, SCR 1-7) were expressed in insect cells for functional assays.
  • Functional characterization included cofactor activity assays, C3b/C3d binding, heparin binding, and cell surface binding via FACS.

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Main Results:

  • Pig Factor H shares 62% identity with human Factor H and possesses 20 SCR domains.
  • The N-terminal construct (SCR 1-4) exhibited cofactor activity for human C3b cleavage and bound human C3b.
  • Pig Factor H demonstrated heparin-binding sites and C-terminal binding to human endothelial cells.

Conclusions:

  • Pig Factor H shares functional characteristics with human Factor H in complement regulation and cell binding.
  • These findings are significant for understanding pig-human complement interactions in xenotransplantation.
  • Further investigation into pig Factor H is warranted for xenotransplantation applications.