Tech

Pig kidneys that were “frozen” for a year have been brought back to life

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 15/10/2026, 09:05:24 UTC.

Briefings

Scientists successfully rewarming pig kidneys previously cooled to -150°C and stored for over a year, marking a milestone in organ banking. The process involves vitrification using iron oxide nanoparticles activated by electromagnetic fields. While the kidneys regained color and urine production, long-term viability remains unproven. The research was conducted by a team at the University of Minnesota, with findings shared on the preprint server bioRxiv before peer review.

Key points

• Pig kidneys cooled to -150°C and stored for over a year were successfully rewarmed, regaining color and urine production after transplantation into pigs.
• The team used iron oxide nanoparticles activated by electromagnetic fields to rewarm the organs, a method previously tested on rat kidneys in 2023.

Context and limitations

The study covers only pig kidneys, not human organs. Long-term viability for sustained life has not been demonstrated, and the research remains unpeer-reviewed.

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