What is it about?
Cryopreserving a mammalian brain is difficult because ice crystals mechanically damage nanoscopic structures like synapses, and the chemicals used to protect the tissue can cause osmotic stress and toxicity. To overcome this, we used "vitrification"—an ice-free cryopreservation method that preserves the tissue in a glass-like state at -196°C, completely pausing all molecular mobility. We tested this on the adult mouse hippocampus, the brain's central hub for memory and a highly vulnerable area in disorders like Alzheimer's disease. Upon rewarming, the tissue successfully retained its structural integrity and metabolism. Most importantly, it resumed measurable electrical information processing, including long-term potentiation, which is the core cellular mechanism of learning and memory.
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Why is it important?
This research addresses a fundamental, decades-old biophysical question: if brain function is an emergent property of its physical structure, can it be restarted after a complete shutdown in the vitreous state? Near-physiological functional recovery, indicates that this is possible. Immediately, this allows neuroscientists to preserve viable tissue in a near-native state, distribute experiments across time and locations, improve reproducibility, and reduce animal usage. In the longer term, while scaling to larger mammalian organs remains a challenge due to heat transfer and toxicity limits, this work represents a crucial step forward for life-suspending technologies, pushing the boundaries of future medical applications like organ banking and protecting the brain during severe disease.
Perspectives
What inspired us was the unresolved question of how far the brain can tolerate profound hypothermia. Investigating this seemed ambitious ex ante, and it was difficult to get this research started, but seeing the resumption of action potentials and synaptic plasticity was rewarding. While recovery is remarkably close to normal, there is still a lot of work to be done to perfect tissue preservation and eventually scale to whole organs. As our next steps, we are extending this protocol from murine models to human neural tissue, where we already have proof-of-concept data, and toward organotypic slice cultures to understand the long-term stability of this recovery.
Alexander German
Friedrich-Alexander-Universitat Erlangen-Nurnberg
Read the Original
This page is a summary of: Functional recovery of the adult murine hippocampus after cryopreservation by vitrification, Proceedings of the National Academy of Sciences, March 2026, Proceedings of the National Academy of Sciences,
DOI: 10.1073/pnas.2516848123.
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