Pig Neurons in Human Brains? The 2025 Reality Check on Neuron Xenotransplantation—Breakthroughs, Risks, and What Happens Next
Porcine interneuron precursors have successfully engrafted and functioned in rodents and an epileptic sea lion. Human neurons and glia have integrated into animal brains in research settings. In 2024–2025, FDA-cleared kidney xenotransplant trials began enrolling, and regulators updated guidance, but neuron xenotransplantation in humans has not yet started. Advances in CRISPR and immune-shielded pigs have improved safety foundations.