Wound dressing material containing lyophilized allogeneic cultured cells

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Wound Healing Research

Background:

• Topical growth factors accelerate wound healing, but allogeneic cultured cells offer a more physiological approach by releasing multiple mediators.
• Clinical use of cultured cells requires cryopreservation, posing logistical challenges.
• Novel wound dressings incorporating lyophilized allogeneic cultured cells (epithelial cells and/or fibroblasts) were developed to address cryopreservation inconvenience.

Purpose of the Study:

• To evaluate the growth factor release profiles of novel lyophilized allogeneic cultured cell-based wound dressings.
• To compare the efficacy of lyophilized versus cryopreserved cell preparations in releasing key wound healing mediators.
• To investigate the influence of cell type (fibroblasts, epithelial cells, or co-cultures) on growth factor release after lyophilization.

Main Methods:

• Development of wound dressing materials containing lyophilized allogeneic cultured epithelial cells and/or fibroblasts.
• Assessment of cell morphology retention after lyophilization.
• Quantification of growth factor release (specifically bFGF and VEGF) from both lyophilized and cryopreserved cell preparations.
• Comparative analysis of growth factor concentrations between lyophilized and cryopreserved groups, and between different cell culture conditions (single cell type vs. co-culture).

Main Results:

• Cultured cells maintained their morphology post-lyophilization and demonstrated growth factor release.
• Lyophilized fibroblasts, when used alone, exhibited significantly higher growth factor concentrations compared to cryopreserved fibroblasts, with a nearly hundredfold increase in basic fibroblast growth factor (bFGF) release.
• Co-culture of epithelial cells and fibroblasts in the dressing material resulted in higher bFGF and vascular endothelial growth factor (VEGF) release from the cryopreserved formulation compared to the lyophilized one, suggesting cell-cell interaction regulates release.

Conclusions:

• Lyophilization is a viable method for preserving the functionality of allogeneic cultured cells in wound dressings, offering potential advantages in convenience over cryopreservation.
• The release kinetics of growth factors from lyophilized cell dressings differ based on cell type and culture conditions, with potential implications for treatment strategies.
• The transient burst release observed with lyophilized cells may necessitate repeated applications for managing complex or chronic wounds, warranting further investigation into optimal dosing regimens.