title: Use of mesenchymal stem cells in a collagen matrix for Achilles tendon repair.
abstract: This investigation tested the hypothesis that delivering mesenchymal stem cell-seeded implants to a tendon gap model results in significantly improved repair biomechanics. Cultured, autologous, marrow-derived mesenchymal stem cells were suspended in a collagen gel delivery vehicle; the cell-gel composite was subsequently contracted onto a pretensioned suture. The resulting tissue prosthesis was then implanted into a 1-cm-long gap defect in the rabbit Achilles tendon. Identical procedures were performed on the contralateral tendon, but only the suture material was implanted. The tendon-implant constructs were evaluated 4, 8, and 12 weeks later by biomechanical and histological criteria. Significantly greater load-related structural and material properties were seen at all time intervals in the mesenchymal stem cell-treated tendons than in the contralateral, treated control repairs (p < 0.05), which contained suture alone with natural cell recruitment. The values were typically twice those for the control tissues at each time interval. Load-related material properties for the treated tissues also increased significantly over time (p < 0.05). The treated tissues had a significantly larger cross-sectional area (p < 0.05), and their collagen fibers appeared to be better aligned than those in the matched controls. The results indicate that delivering mesenchymal stem cell-contracted, organized collagen implants to large tendon defects can significantly improve the biomechanics, structure, and probably the function of the tendon after injury.
authors.affiliation: Osiris Therapeutics, Cleveland, Ohio, USA. ryoung@osiristx.com
authors.forename: R G
authors.initials: RG
authors.lastname: Young
authors.forename: D L
authors.initials: DL
authors.lastname: Butler
authors.forename: W
authors.initials: W
authors.lastname: Weber
authors.forename: A I
authors.initials: AI
authors.lastname: Caplan
authors.forename: S L
authors.initials: SL
authors.lastname: Gordon
authors.forename: D J
authors.initials: DJ
authors.lastname: Fink
mesh_terms: D000125:Achilles Tendon / Q000293:injuries* / Q000473:pathology / Q000503:physiopathology; D000818:Animals; D001696:Biomechanical Phenomena; D002478:Cells, Cultured; D003094:Collagen; D005260:Female; D008648:Mesoderm / Q000166:cytology*; D011817:Rabbits; D033581:Stem Cell Transplantation; D013536:Suture Techniques; D013708:Tendon Injuries / Q000473:pathology / Q000503:physiopathology / Q000601:surgery*; D014945:Wound Healing
chemical_list: D003094:Collagen