Repair of osteochondral defects with adipose stem cells and a dual growth factor-releasing scaffold in rabbits.

Abstract

The purpose of this work was to evaluate the in vivo effectiveness of a TGF-beta(2) and bone morphogenetic protein (BMP)-7-immobilized porous polycaprolactone (PCL)/F127 scaffold to enhance the healing of cartilage defect. An osteochondral defect was created on the patellar groove of the right distal femur of 12 rabbits and managed by one of the following methods: filling it with the scaffold only (Group I); the scaffold seeded with adipose stem cells (ASCs) (Group II); a TGF-beta(2) and BMP-7-immobilized scaffold (Group III); and a TGF-beta(2) and BMP-7-immobilized scaffold seeded with ASCs (Group IV). Each group had three rabbits. Nine weeks after the implantation, the implanted scaffolds were filled with yellowish, dense tissue, and had distinct margins with adjacent normal cartilage. The histological findings showed infiltration of foreign-body giant cells and blood vessel, more prominently in Groups III and IV. The presence of growth factor significantly increased the ICRS Macroscopic Score (p = 0.045) while the presence of ASC did not. The ICRS Visual Histological Score was not significantly affected by the presence of either growth factors or ASCs, showing similar values in all groups. In conclusion, the use of TGF-beta(2) and BMP-7-immobilized PCL/F127 scaffolds improved gross appearances of the osteochondral defects while not actually leading to better histological results and induced a greater degree of foreign body reaction.

• Authors: Gun-Il Im, Jin Ho Lee
• Journal: Journal of biomedical materials research. Part B, Applied biomaterials (J Biomed Mater Res B Appl Biomater) Vol. 92 Issue 2 Pg. 552-60 (Feb 2010) ISSN: 1552-4981 [Electronic] United States
• PMID: 19957354 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Biocompatible Materials
• Bone Morphogenetic Protein 7
• Fibrinolytic Agents
• Intercellular Signaling Peptides and Proteins
• Phenazines
• Polyesters
• Transforming Growth Factor beta2
• Poloxamer
• polycaprolactone
• Heparin
• safranine T

Topics

• Adipocytes (drug effects)
• Animals
• Biocompatible Materials
• Bone Morphogenetic Protein 7 (administration & dosage, pharmacology)
• Cartilage (cytology, drug effects, growth & development)
• Cell Differentiation (drug effects)
• Cell Separation
• Chondrocytes (drug effects)
• Fibrinolytic Agents (administration & dosage, chemistry)
• Heparin (administration & dosage, chemistry)
• Immunohistochemistry
• Intercellular Signaling Peptides and Proteins (administration & dosage, chemistry, pharmacology)
• Osteocytes (drug effects)
• Phenazines
• Poloxamer
• Polyesters
• Rabbits
• Regeneration (drug effects)
• Stem Cells (drug effects)
• Tissue Scaffolds (chemistry)
• Transforming Growth Factor beta2 (administration & dosage, pharmacology)