Novel Long-Term Cryo-Storage Using Vitrification and Laser Warming Techniques.

Area of Science:

• Cryobiology
• Biomedical Engineering
• Materials Science

Background:

• Vitrification and laser warming are increasingly preferred over traditional convective warming in cryopreservation due to rapid, uniform heating that prevents ice crystal formation.
• Current laser warming research primarily focuses on proof-of-concept experiments, lacking established protocols for warming samples after long-term storage.

Purpose of the Study:

• To develop and present a novel approach for laser warming cryopreserved samples without exposing them to ambient temperatures.
• To demonstrate the feasibility of warming samples from long-term storage using a new laser warming device.

Main Methods:

• A new device was designed for laser warming of vitrified samples, specifically addressing the challenge of warming from long-term storage.
• The device was tested on samples with volumes less than 1 microliter, evaluating laser-hitting accuracy and rewarming rates.

Main Results:

• The developed device achieved a mean laser-hitting accuracy of 76% ± 16%.
• The mean rewarming rate for samples was 59% ± 25%.
• Performance metrics are influenced by the vitrification solution and user technique.

Conclusions:

• The presented approach represents a significant initial step towards effective laser warming of samples from long-term cryo-storage.
• Further refinement of the technique and device is necessary for widespread application.