Aim: Adipose tissue-derived microvascular fragments (ad-MVF) are vascularization units for regenerative medicine. We investigated whether University of Wisconsin (UW) solution is suitable for their xeno-free storage. Materials & methods: Murine ad-MVF were cultivated for 24 h in 4°C or 20°C UW solution and 20°C endothelial cell growth medium (control). The ad-MVF were seeded onto collagen-glycosaminoglycan scaffolds, which were analyzed in dorsal skinfold chambers by intravital fluorescence microscopy and histology. Results: All implants exhibited microvascular networks on day 14 with the highest functional microvessel density in controls. Ad-MVF cultivation in UW solution at 4°C resulted in an improved scaffold vascularization compared with cultivation at 20°C. Conclusion: UW solution is suitable for the hypothermic storage of ad-MVF.
Keywords: UW solution; angiogenesis; cultivation; dorsal skinfold chamber; intravital fluorescence microscopy; microvascular fragments; scaffold; tissue engineering; vascularization.