Optimization of Adipose Tissue Cryopreservation Techniques in a Murine Model

Area of Science:

• Tissue Engineering and Regenerative Medicine
• Cryobiology
• Adipose Tissue Biology

Background:

• Adipose tissue (AT) transplantation is a common procedure, but preserving its viability and functionality post-transplantation is challenging.
• Effective cryopreservation protocols are needed to ensure the long-term storage and successful engraftment of AT grafts.

Purpose of the Study:

• To develop a simple, effective adipose tissue cryopreservation protocol.
• To evaluate the impact of different cryopreservation temperatures and agents on AT viability and morphology.
• To assess the functionality and vascularization of cryopreserved AT following transplantation.

Main Methods:

• Compared slow-freezing protocols at -20°C and -80°C using trehalose or hydroxyethyl starch (HES) as cryoprotective agents (CPAs).
• Evaluated tissue morphology and viability (GAPDH gene expression) in experimental groups and a fresh AT control.
• Conducted in vivo studies transplanting cryopreserved AT into immunodeficient mice, assessing graft take, viability (GAPDH), and vascularization (VEGF).

Main Results:

• Histological analysis showed preserved AT morphology across all cryopreserved groups, comparable to fresh tissue.
• No statistically significant differences in tissue viability (GAPDH expression) were observed between temperature or CPA groups.
• In vivo studies demonstrated successful graft take, preserved AT architecture, and developed vascular networks with no significant differences in graft take, GAPDH, or VEGF expression.

Conclusions:

• Cryopreservation of adipose tissue at -20°C using either trehalose or HES is a straightforward and effective procedure.
• These methods maintain adipose tissue viability and morphohistological characteristics, yielding results comparable to fresh adipose tissue.