Comparative characteristics of microcirculatory changes in white rats during subcutaneous implantation tests of polycaprolactone scaffolds containing vaterite and hydroxyapatite

Objective: comparative evaluation of skin microcirculatory functional changes over the implantation area of polycap-rolactone scaffolds with mineral carriers: vaterite and hydroxyapatite. Material and Methods. The experimental study was performed on 43 rats divided into three groups: two test groups and one negative control group. Polycaprolactone PCL-scaffolds containing ovalbumine and of no biocompatibility were implanted into the rats of negative control group (n=15). The implantation of PCL- scaffolds containing vaterite under their skin was performed on rats of the first test group, and animals of the second test group were implanted with PCL-scaffolds containing hydroxyapatite. The method of laser Doppler flowmetry was used to study the microcirculatory flow. Results. The constant increase in the perfusion index has been observed in the area of non-biocompatibile scaffolds implantation. Thechanges in local skin blood flow modulation have been also detected. The transient character of local microcirculatory responses with total normalization of skin perfusion and its mechanisms has been noticed by the 21st day of the trial following PCL-scaffolds with vaterite and hydroxyapatite implantation. Conclusion. The dynamic monitoring has allowed finding that mineralization of PCL-scaffolds with vaterite as well as hydroxyapatite leads to no prominent changes in skin perfusion at subcutaneous implantation tests on white rats suggesting the biocompatibility of these scaffold types.