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Related Experiment Videos

Cardiac xenotransplantation

J H Artrip1, S Itescu, O P Minanov

  • 1Division of Cardiothoracic Surgery, Columbia-Presbyterian Medical Center, New York, NY 10032, USA.

Current Opinion in Cardiology
|March 1, 1997
PubMed
Summary

Xenotransplantation using genetically modified pig organs faces rejection challenges. New transgenic pigs with reduced galactose alpha 1,3-galactose epitopes show promise but require further strategies to overcome subsequent xenograft rejection barriers.

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Area of Science:

  • Transplantation immunology
  • Genetic engineering
  • Xenotransplantation

Background:

  • Severe shortage of human donor organs necessitates alternative solutions like xenografts.
  • Pig-to-primate xenotransplantation faces hyperacute rejection due to antibodies against galactose alpha 1,3-galactose (Gal alpha 1,3-Gal) epitopes.
  • Conventional immunosuppression is insufficient to prevent hyperacute rejection.

Purpose of the Study:

  • To review strategies for overcoming hyperacute rejection in xenotransplantation.
  • To discuss genetic modifications in pigs to reduce antigenic barriers.
  • To highlight the need for new approaches to address subsequent xenograft rejection.

Main Methods:

  • Development of transgenic pigs expressing human complement regulatory proteins.

Related Experiment Videos

  • Genetic engineering to eliminate or reduce Gal alpha 1,3-Gal epitopes.
  • Evaluation of heterotopic transplantation of genetically modified porcine hearts.

    • Main Results:

    • Transgenic pigs expressing human complement regulatory proteins showed moderate success in heterotopic transplantation.
    • Pigs engineered to express H-transferase gene exhibit reduced Gal alpha 1,3-Gal epitope expression.
    • Current genetic technologies are not yet available to completely knock out enzymes for Gal alpha 1,3-Gal synthesis in pigs.

    Conclusions:

    • Genetically engineered pigs offer potential to overcome hyperacute xenograft rejection.
    • Reduced Gal alpha 1,3-Gal epitope expression in transgenic pigs may mitigate initial immune responses.
    • Further research is crucial to develop strategies addressing subsequent barriers to successful xenograft survival.