title: Repair of osteochondral defects with biodegradable hydrogel composites encapsulating marrow mesenchymal stem cells in a rabbit model.
abstract: This work investigated the delivery of marrow mesenchymal stem cells (MSCs), with or without the growth factor transforming growth factor-beta1 (TGF-beta1), from biodegradable hydrogel composites on the repair of osteochondral defects in a rabbit model. Three formulations of oligo(poly(ethylene glycol) fumarate) (OPF) hydrogel composites containing gelatin microparticles (GMPs) and MSCs were implanted in osteochondral defects, including (i) OPF/GMP hydrogel composites; (ii) OPF/GMP hydrogel composites encapsulating MSCs; and (iii) OPF hydrogel composites containing TGF-beta1-loaded GMPs and MSCs. At 12weeks, the quality of new tissue formed in chondral and subchondral regions of defects was evaluated based on subjective and quantitative histological analysis. OPF hydrogel composites were partially degraded and the defects were filled with newly formed tissue at 12weeks with no sign of persistent inflammation. With the implantation of scaffolds alone, newly formed chondral tissue had an appearance of hyaline cartilage with zonal organization and intense staining for glycosaminoglycans, while in the subchondral region hypertrophic cartilage with some extent of bone formation was often observed. The addition of MSCs, especially with TGF-beta1-loaded GMPs, facilitated subchondral bone formation, as evidenced by more trabecular bone appearance. However, the delivery of MSCs with or without TGF-beta1 at the dosage investigated did not improve cartilage morphology. While OPF-based hydrogel composites supported osteochondral tissue generation, further investigations are necessary to elucidate the effects of MSC seeding density and differentiation stage on new tissue formation and regeneration.
authors: Department of Chemical and Biomolecular Engineering, Rice University, MS-362, P.O. Box 1892, Houston, TX 77251-1892, USA.
authors: Xuan
authors: X
authors: Guo
authors: Hansoo
authors: H
authors: Park
authors: Simon
authors: S
authors: Young
authors: James D
authors: JD
authors: Kretlow
authors: Jeroen J
authors: JJ
authors: van den Beucken
authors: L Scott
authors: LS
authors: Baggett
authors: Yasuhiko
authors: Y
authors: Tabata
authors: F Kurtis
authors: FK
authors: Kasper
authors: Antonios G
authors: AG
authors: Mikos
authors: John A
authors: JA
authors: Jansen
mesh_terms: D020341:Absorbable Implants; D000818:Animals; D001672:Biocompatible Materials / Q000737:chemistry*; D001854:Bone Marrow Cells / Q000166:cytology*; D002356:Cartilage / Q000737:chemistry; D016503:Drug Delivery Systems; D006025:Glycosaminoglycans / Q000737:chemistry; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate / Q000737:chemistry*; D020100:Hydrogels / Q000737:chemistry; D059630:Mesenchymal Stem Cells / Q000166:cytology*; D011091:Polyesters / Q000737:chemistry; D011092:Polyethylene Glycols / Q000737:chemistry; D011817:Rabbits; D053773:Transforming Growth Factor beta1 / Q000378:metabolism; D014945:Wound Healing
chemical_list: D001672:Biocompatible Materials; D006025:Glycosaminoglycans; D020100:Hydrogels; D011091:Polyesters; D053773:Transforming Growth Factor beta1; C469550:oligo(poly(ethylene glycol)fumarate); D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D011092:Polyethylene Glycols