[Study on cryopreservation of tissue engineered tendon by vitrification]

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Cryobiology

Background:

• Cryopreservation of tissue-engineered constructs is essential for clinical applications.
• Vitrification offers a promising approach for cryopreserving delicate tissues like engineered tendons.
• Optimizing cryoprotective agents (CPAs) is critical for maintaining tissue viability and function post-thaw.

Purpose of the Study:

• To evaluate the efficacy of different cryoprotective agents (CPAs) for vitrifying tissue-engineered tendons (TET).
• To assess the impact of CPAs on cellular morphology and post-thaw viability of TET.
• To identify the most suitable CPA for practical cryopreservation of TET.

Main Methods:

• Three CPAs were tested: 21% dimethyl sulfoxide (DMSO), DP6, and VS55.
• Tissue-engineered tendons (TET) were vitrified using the selected CPAs.
• Cellular morphology and post-thaw viability were analyzed using scanning electron microscopy (SEM), flow cytometry, and confocal laser microscopy (CLM).

Main Results:

• A statistically significant difference in post-thaw viability was observed between 21% DMSO and the other CPAs (DP6, VS55).
• Cells treated with 21% DMSO demonstrated superior adhesion to the scaffold surface, both pre- and post-cryopreservation.
• 21% DMSO resulted in better preservation of cellular integrity and viability compared to DP6 and VS55.

Conclusions:

• 21% DMSO is a more effective cryoprotective agent for tissue-engineered tendon (TET) cryopreservation via vitrification than DP6 and VS55.
• The superior performance of 21% DMSO is attributed to its ability to maintain cell-scaffold adhesion and overall cell viability.
• This finding supports the use of 21% DMSO for practical cryopreservation strategies in tendon tissue engineering.