Effect of cryopreservation on therapeutic potential of canine bone marrow derived mesenchymal stem cells augmented mesh scaffold for wound healing in guinea pig.

The objective of this study was to compare the therapeutic potential of canine bone marrow derived mesenchymal stem cells (BM MSCs) augmented mesh scaffold for wound healing potential in guinea pig before and after cryopreservation. Bone marrow aspirate was obtained from healthy dogs and culture was expanded in vitro. MSCs augmented mesh scaffold were cryopreserved for 30 days and then used for therapeutic purposes. Both fresh and frozen thaw MSCs augmented mesh scaffold along with fresh MSCs were used for therapeutic purposes in guinea pig. No significant (P > 0.05) difference was observed in population doubling time (PDT) among fresh and frozen thawed BM MSCs. Both fresh and frozen thawed BM MSCs expressed cell surface markers (CD73, CD90, and CD105), and did not express CD34 as was confirmed by Immunocytochemistry and Real-Time Polymerase Chain Reaction. The fresh and frozen thawed BM MSCs successfully differentiated into osteogenic, chondrogenic and adipogenic lineages. Therapeutic results revealed that the percent wound contraction on day 14 was more than 65 % for the mesh augmented with MSCs as well as freshly injected MSCs group as against 33-34 % in the control group. Healed wound quality parameters viz. surface epithelium, neovascularization, and collagen characteristics were better for the mesh augmented with MSCs as well as freshly injected MSCs group compared to the control group. No significant difference was noted among fresh and frozen thawed BM MSCs group and fresh MSCs injected group. Thus, it is concluded from this study that canine BM MSCs augmented mesh scaffold both fresh and frozen thaw can be used for quality wound healing.