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Xenotransplantation Research -the Nonhuman Primate Model Is Preferable to the Human Decedent Model
D K C Cooper1, L Mou2, J D Cleveland3
1Department of Surgery, Center for Transplantation Sciences, Massachusetts General Hospital/Harvard Medical School, Boston, MA, United States.
Summary
Pig-to-nonhuman primate models are crucial for advancing xenotransplantation research. Experiments in brain-dead human decedents cannot replace these vital nonhuman primate studies for monitoring long-term organ graft function.
Area of Science:
- Transplantation Biology
- Xenotransplantation Research
- Surgical Innovation
Background:
- Pig-to-nonhuman primate (NHP) models have driven xenotransplantation progress over 40 years.
- Initial US FDA-approved clinical trials in xenotransplantation are underway.
- The pig-to-human brain-dead decedent model is a recent development.
Purpose of the Study:
- To evaluate the utility of the pig-to-human brain-dead decedent model in xenotransplantation research.
- To compare the limitations and benefits of decedent models versus NHP models.
- To assess the potential impact of decedent model data on regulatory approval for clinical trials.
Main Methods:
- Comparative analysis of xenotransplantation models.
- Review of data acquisition capabilities in pig-to-NHP versus pig-to-decedent models.
- Assessment of metabolic and hemodynamic stability in decedent subjects for graft monitoring.
Main Results:
- Decendent models have limited periods for metabolic and hemodynamic stability, hindering prolonged graft monitoring.
- Pig-to-NHP models already achieve prolonged graft function monitoring.
- Data from decedent models may be confounded by brain death complications, potentially leading to overly cautious regulatory reviews.
Conclusions:
- Pig-to-human brain-dead decedent models have significant limitations for monitoring xenograft function.
- Decendent models cannot replace pig-to-NHP models for generating robust xenotransplantation data.
- Continued reliance on pig-to-NHP models is essential for advancing xenotransplantation research and clinical translation.
