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Related Experiment Videos

Gal knockout and beyond.

R Zhong1

  • 1Department of Surgery, University of Western Ontario, Multi-Organ Transplant Program, London Health Sciences Centre, Transplantation Group, Robarts Research Institute, London, Ontario, Canada.

American Journal of Transplantation : Official Journal of the American Society of Transplantation and the American Society of Transplant Surgeons
|January 18, 2007
PubMed
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Gal knockout pigs show promise in xenotransplantation, preventing hyperacute rejection in primate studies. However, graft survival remains limited, necessitating further research into non-Gal antigens and donor modifications for improved outcomes.

Area of Science:

  • Xenotransplantation research
  • Immunology
  • Genetics

Background:

  • Gal knockout (k/o) pigs have been developed using genetic cloning.
  • This development has generated significant enthusiasm for xenotransplantation.
  • Nonhuman primate experiments using Gal k/o pig organs are crucial for assessing xenograft viability.

Purpose of the Study:

  • To review the current status of nonhuman primate experiments using Gal k/o pig organs.
  • To analyze the outcomes and challenges of xenotransplantation with Gal k/o pig organs.
  • To identify future research directions for improving xenograft survival.

Main Methods:

  • Transplantation of Gal k/o pig organs into nonhuman primates.
  • Monitoring for hyperacute rejection and graft survival.

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  • Analysis of immune responses, including anti-non-Gal antibodies.

    • Main Results:

    • Hyperacute rejection was prevented with Gal k/o pig organs.
    • Graft survival was prolonged up to a few months in some cases.
    • Overall results were not superior to Gal-positive pig organs with human complement regulatory proteins.
    • Gal k/o pig kidneys showed rapid rejection associated with increased anti-non-Gal antibodies.

    Conclusions:

    • Gal knockout technology is a significant advancement but does not fully resolve xenograft rejection.
    • Mechanisms of rejection may involve incomplete Gal deletion, non-Gal antigens, or anti-non-Gal antibodies.
    • Future strategies should focus on multi-gene modifications, tolerance induction, and accommodation for successful xenotransplantation.