Design and testing of a humanized porcine donor for xenotransplantation.
Level 5 - mechanism / opinion, no new human data
Preclinical bench and nonhuman primate animal research.
PubMed 37821590 · doi:10.1038/s41586-023-06594-4
What was done
Porcine donors were genetically modified with 69 genomic edits, including glycan antigen knockouts, human transgene overexpression, and inactivation of porcine endogenous retroviruses. Edited porcine endothelial cells were assessed in vitro for inflammatory modulation against human endothelial cells. Kidneys from these edited donors (either glycan knockouts alone or glycan knockouts combined with human transgenes) were then transplanted into cynomolgus monkeys to evaluate graft survival.
What was found
In vitro, modified porcine kidney endothelial cells showed inflammation modulation indistinguishable from human endothelial cells. In vivo, cynomolgus monkeys receiving grafts with only three glycan knockouts had poor graft survival, whereas recipients of grafts with both glycan knockouts and human transgenes demonstrated significantly longer survival times. The abstract reports no exact numeric survival durations, sample sizes, or statistical parameters.
Why it matters
This demonstrates that extensive genomic edits, particularly combining human transgene expression with glycan antigen removal and retroviral inactivation, improve renal xenograft compatibility and survival in nonhuman primates, serving as a preclinical foundation for human trials.
Limits
The study is restricted to a nonhuman primate model and in vitro assays, which may not fully replicate human clinical immune responses. The abstract omits sample sizes, specific survival durations, statistical effect estimates, immunosuppression regimens, and long-term functional metrics.
Cited by
- supports Non-human primates receiving germline gene-edited pig organ transplants have achieved survival times of approximately 500 to 600 days.