J Vet Sci.  2019 Nov;20(6):e63. 10.4142/jvs.2019.20.e63.

Frozen-thawed gelatin-induced osteogenic cell sheets of canine adipose-derived mesenchymal stromal cells improved fracture healing in canine model

Affiliations
  • 1BK21 PLUS Program for Creative Veterinary Science Research, Research Institute for Veterinary Science and College of Veterinary Medicine, Seoul National University, Seoul 08826, Korea. ohkweon@snu.ac.kr

Abstract

We assessed the efficacy of frozen-thawed gelatin-induced osteogenic cell sheet (FT-GCS) compared to that of fresh gelatin-induced osteogenic cell sheet (F-GCS) with adipose-derived mesenchymal stromal cells (Ad-MSCs) used as the control. The bone differentiation capacity of GCS has already been studied. On that basis, the experiment was conducted to determine ease of use of GCS in the clinic. In vitro evaluation of F-GCS showed 3-4 layers with an abundant extracellular matrix (ECM) formation; however, cryopreservation resulted in a reduction of FT-GCS layers to 2-3 layers. Cellular viabilities of F-GCS and FT-GCS did not vary significantly. Moreover, there was no significant difference in mRNA expressions of Runx2, β-catenin, OPN, and BMP-7 between F-GCS and FT-GCS. In an in vivo experiment, both legs of six dogs with transverse radial fractures were randomly assigned to one of three groups: F-GCS, FT-GCS, or control. Fracture sites were wrapped with the respective cell sheets and fixed with 2.7 mm locking plates and six screws. At 8 weeks after the operations, bone samples were collected and subjected to micro computed tomography and histopathological examination. External volumes of callus as a portion of the total bone volume in control, F-GCS, and FT-GCS groups were 49.6%, 45.3%, and 41.9%, respectively. The histopathological assessment showed that both F-GCS and FT-GCS groups exhibited significantly (p < 0.05) well-organized, mature bone with peripheral cartilage at the fracture site compared to that of the control group. Based on our results, we infer that the cryopreservation process did not significantly affect the osteogenic ability of gelatin-induced cell sheets.

Keyword

Gelatin-induced cell sheets; osteogenic differentiation; bone healing; dogs

MeSH Terms

Animals
Bone Morphogenetic Protein 7
Bony Callus
Cartilage
Cryopreservation
Dogs
Extracellular Matrix
Fracture Healing*
In Vitro Techniques
Leg
Mesenchymal Stromal Cells*
RNA, Messenger
Bone Morphogenetic Protein 7
RNA, Messenger
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