The critical shortage of donor organs is largely driven by the limited time they remain viable outside the human body. While traditional ice storage only preserves organs for a few hours, scientists are developing innovative techniques to extend this window, potentially enabling the creation of organ banks for better matching and transport.
A significant breakthrough recently occurred in pig kidney research, where a team led by Matthew Powell Palm successfully supercooled organs to -4 °C. These kidneys were later reimplanted, demonstrating better outcomes than those preserved on ice. Unlike cryopreservation—which attempts to store cells at ultra-low temperatures using chemical protectants—this supercooling method does not require such additives.
Cryopreservation remains a challenge for complex organs. While it is standard practice for eggs, sperm, and embryos, the formation of ice crystals typically destroys larger organs. Although some cryonics facilities have preserved human brains at temperatures as low as -146 °C, experts caution that cell recovery upon rewarming does not equate to biological viability or the ability to reanimate tissue.
Beyond cooling, machine perfusion is gaining traction as a method to sustain organs by circulating nutrients, mimicking the body's natural environment. While typically used to maintain livers and kidneys for up to 24 hours, the technology is expanding to other areas, including experimental systems for eyeballs and uteruses. These developments represent a growing effort to overcome the biological time constraints that currently limit transplantation success.
Source: MIT Technology Review
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