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Therapeutic interventions in xenotransplantation
C Knosalla1, B Gollackner, F J M F Dor
1Transplantation Biology Research Center, Massachusetts General Hospital/Harvard Medical School, Building 149-9019, 13th Street, Boston, MA 02129, USA.
Current Drug Targets. Cardiovascular & Haematological Disorders
|May 29, 2003
Summary
Xenotransplantation using pig organs could solve organ shortages but faces immune rejection due to antibodies targeting Galalpha1,3Gal epitopes. Genetic modification of pigs to lack these epitopes shows promise for reducing required therapies and inducing tolerance.
Area of Science:
- Transplantation immunology
- Xenotransplantation research
- Genetically modified animals
Background:
- Xenotransplantation, using organs from one species to another, offers a solution to the critical shortage of human organs.
- Pig-to-human xenotransplantation faces significant immunological barriers, primarily antibody-mediated rejection triggered by natural antibodies against Galalpha1,3Gal epitopes on pig vascular endothelium.
- These immune responses, along with physiological incompatibilities like coagulation issues, can lead to organ destruction and fatal complications.
Purpose of the Study:
- To review the challenges and therapeutic strategies for overcoming immunological and physiological barriers in pig-to-human xenotransplantation.
- To highlight the potential of genetically modified pigs in mitigating xenograft rejection.
- To discuss the necessity of multiple therapeutic interventions for successful xenotransplantation.
Main Methods:
- Investigating methods to deplete natural antibodies and inhibit complement activation.
- Exploring suppression of elicited T cell-dependent antibody and cellular responses.
- Examining physiological incompatibilities, particularly in coagulation, and developing countermeasures.
- Developing strategies to prevent xenozoonotic infections.
Main Results:
- Natural antibodies in primates against Galalpha1,3Gal epitopes cause early antibody-mediated rejection.
- Both natural and elicited antibody responses, alongside physiological incompatibilities, contribute to organ destruction and coagulopathy.
- Breeding pigs that lack Galalpha1,3Gal epitopes is a promising development.
Conclusions:
- Successful xenotransplantation currently requires multiple, complex therapeutic interventions.
- Genetically engineered pigs lacking critical epitopes significantly reduce the need for extensive therapy.
- The development of Galalpha1,3Gal-negative pigs may pave the way for inducing tolerance to transplanted organs.