US surgeons successfully test pig kidney transplant in human patient

The recipient was a brain-dead patient with signs of kidney dysfunction

A pig kidney has been transplanted into a human without triggering immediate rejection by the recipient’s immune system, a potentially major advance that could eventually help alleviate a dire shortage of human organs for transplant.

The procedure done at NYU Langone Health in New York City involved the use of a pig whose genes had been altered so that its tissues no longer contained a molecule known to trigger almost immediate rejection.

The recipient was a brain-dead patient with signs of kidney dysfunction whose family consented to the experiment before she was due to be taken off of life support.

For three days, the new kidney was attached to her blood vessels and maintained outside her body, giving researchers access to it.

Test results of the transplanted kidney’s function ‘looked pretty normal,’ said transplant surgeon Dr Robert Montgomery, who led the study.

The kidney made ‘the amount of urine that you would expect’ from a transplanted human kidney, he said, and there was no evidence of the vigorous, early rejection seen when unmodified pig kidneys are transplanted into non-human primates.

Researchers have been working for decades on the possibility of using animal organs for transplants, but have been stymied over how to prevent immediate rejection by the human body. Montgomery’s team theorised that knocking out the pig gene for a carbohydrate that triggers rejection – a sugar molecule, or glycan, called alpha-gal – would prevent the problem.

The genetically altered pig, dubbed GalSafe, was developed by United Therapeutics Corp’s Revivicor unit. It was approved by the US Food and Drug Administration in December 2020, for use as food for people with a meat allergy and as a potential source of human therapeutics.

Medical products developed from the pigs would still require specific FDA approval before being used in humans, the agency said.

Other researchers are considering whether GalSafe pigs can be sources of everything from heart valves to skin grafts for human patients.

The NYU kidney transplant experiment should pave the way for trials in patients with end-stage kidney failure, possibly in the next year or two, said Montgomery, himself a heart transplant recipient. Those trials might test the approach as a short-term solution for critically ill patients until a human kidney becomes available, or as a permanent graft.

Reuters