Progress made in transplanting pig hearts into baboons

December 6, 2018 by Bob Yirka, Medical Xpress report
Credit: CC0 Public Domain

A large team of researchers from several institutions in Germany, Sweden, Switzerland and the U.S. has transplanted pig hearts into baboons and kept them alive for an extended period of time. In their paper published in the journal Nature, the group describes changes they made to heart transplant procedures and how well they worked. Christoph Knosalla with the German Heart Center Berlin has written a News & Views piece on the work done by the team in the same journal issue.

As populations age in advanced countries, medical providers confront a growing number of health issues, one of which is how to deal with from . Currently, the only treatment for such patients is a transplant. But every year, the list grows longer, and many people die waiting for a donor. One possible solution to this problem is to breed animals that are anatomically similar to humans and use their hearts. But thus far, research in this area has run into a wall—baboons that receive pig hearts, for example, rarely live for more than a month. In this new effort, the researchers claim to have overcome the problems associated with transplanting pig hearts into baboons, and in so doing have brought some optimism to the idea of doing the same for humans.

Prior research has shown that there are two main reasons that pig hearts fail to thrive in baboons: damage that occurs during the procedure, and size differences between pigs and baboons.

The normal procedure for preserving a after removal from an animal before transplantation has been immersing it in cold water. But this method has been found to damage heart tissue. To prevent that damage, the researchers periodically pumped a solution of blood mixed with nutrients and hormones and added extra oxygen. Doing so appeared to prevent heart damage.

Pigs are bigger than baboons and thus have bigger hearts—if a pig heart grows to its normal size inside of a baboon, it runs out of room and fails. To prevent this from happening, the researchers gave the baboons medicine to bring their blood pressure down to the level found in . They also gave the baboons a drug that prevents heart growth. And finally, they modified the hormone treatment given to the to prevent immunosuppression—they tapered the cortisone treatments to prevent heart overgrowth.

By combining the techniques, the researchers found they were able to extend the lives of the baboon recipients. Two lived for three months—the length of the study—and another two lived for six months before they were euthanized.

Explore further: New study shows much longer survival for heart transplants across species

More information: Matthias Längin et al. Consistent success in life-supporting porcine cardiac xenotransplantation, Nature (2018). DOI: 10.1038/s41586-018-0765-z

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Osiris1
5 / 5 (1) Dec 07, 2018
Let me guess. The poor baboon's hair turned red and he started talking, in broken English. Everything he said was a lie even in the face of fact standing in front of him...and he doted on phrases like witch hunt, 'no collusion', etc. The topper was when he saw a pic of our sainted ex-president hanging on the wall with the word 'Hope', he passed water, fouled himself, and foamed at the mouth. Then he threw a tantrum.
EnricM
not rated yet Dec 07, 2018
Whaoo! Breakthrough! Now we can finally declare transplanting hearts to baboon an Olympic sport.
Because, seriously: What use is it?

If this has to be applied to humans it will still require more proofs on more type of animals, one more or less makes no difference. And then chances of being of any use are still 50:50 at it's best. And even then the difference it would make would be minimal and not different from pure random chance.

So, is it worth this much effort and resources for playing "Heartswap" with random animals?

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