Tardigrade-inspired treatment improves recovery of frozen mouse red blood cells
A protein fragment paired with trehalose outperformed glycerol in a reported mouse-cell experiment, but its value for human blood storage remains untested.
The American Chemical Society reported on October 8 that a tardigrade-inspired treatment improved recovery of frozen mouse red blood cells in a study published in ACS Applied Materials & Interfaces. The researchers paired a fragment of a protective protein with a sugar, offering a possible route to preserving blood without glycerol. The results are from mouse cells and mice; the society did not report a test involving human blood.
The distinction matters for blood storage. Frozen red cells can help maintain supplies of rare blood types, but established methods use glycerol to protect cells during freezing and require its removal after thawing. An independent review of cryopreserved blood describes that removal as a step that can damage red cells. The new work addresses that processing problem in an experimental setting, with no demonstrated benefit yet for patients.
How the tardigrade-inspired freezing method worked
Tardigrades are known for surviving extreme conditions, including freezing and dehydration. The researchers drew on CAHS, a protective protein associated with that resilience, but used a section of the protein rather than its full-length form. They combined the fragment with trehalose, a sugar that helps stabilize cell membranes and proteins, at low temperature before freezing mouse red blood cells in liquid nitrogen.
According to the ACS account, the combination changed how ice formed and melted, shielding the cells from damage. After thawing, the researchers could wash away the CAHS-trehalose treatment by centrifugation. That removal step is part of the reported laboratory process; whether it would prove simpler or gentler than current procedures at blood-bank scale has not been established.
ACS reported that up to 89% of mouse red blood cells treated with the new method recovered fully, compared with about 82% of cells frozen using glycerol. Those figures indicate an advantage under the reported experimental conditions. The public summary does not give the sample size or explain precisely how full recovery was defined and measured, so the size and reliability of the difference cannot be assessed from that account alone.
What happened after transfusion in mice
The team also assessed the cells after freezing, thawing and washing. ACS said they were biocompatible in the tests described. When the researchers transfused cryopreserved cells into anemic mice, the animals' red-cell counts and hemoglobin levels improved, and the researchers reported no inflammatory response. Those findings extend the experiment beyond cell recovery, but they remain animal results.
Leming Sun, one of the study's corresponding authors, called the work ‘our first attempt to translate a lesson from an extraordinarily resilient organism into a practical cell-preservation strategy.’ Sun said further development could simplify processing after thawing, reduce concerns about residual glycerol and help preserve stored-cell quality. Each is a possible benefit, rather than an outcome established in people.
Why frozen red blood cells already matter
Glycerol-based freezing is a longstanding technique, rather than a newly proposed use for blood banks. A review in Blood Transfusion traces reports of freezing human red cells with glycerol to 1950 and centrifugation-based glycerol removal to 1966. It says civilian and military institutions have used frozen red cells, including to serve patients who need rare blood types. The review also notes that improvements in liquid storage reduced the logistical need for frozen cells in civilian settings.
That history puts the proposed change in perspective: the experiment concerns how to protect cells while they are frozen and prepare them after thawing. It does not show that existing blood supplies can be stored for longer, that transfusions would be safer, or that a glycerol-free process would be practical for routine use. The established technique provides a comparison, but clinical value would depend on results beyond the mouse experiments described by ACS.
What remains unknown before human blood use
The society's public account does not report tests using human donor red cells or transfusions in people. It also gives no clinical-trial or regulatory timetable. The underlying journal article was unavailable during this check, leaving its detailed methods, sample sizes and statistical analysis unverified here. Those gaps matter when interpreting a reported difference of seven percentage points in cell recovery.
The researchers also hope the work will inform other preservation strategies, potentially including protection for blood at room temperature. ACS reported no room-temperature storage result from this study. For now, the supported development is narrower: a tardigrade-derived protein fragment and trehalose improved a reported measure of frozen mouse-cell recovery and showed a benefit after transfusion in anemic mice. Whether the method helps store human blood remains an open question.
Sources and context
- A trick from tardigrades could help human blood withstand freezingPhys.org / Science X
- A trick from tardigrades could help human blood withstand freezingAmerican Chemical Society
- Cryopreserved packed red blood cells in surgical patients: past, present, and futureBlood Transfus. (via PubMed Central)
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