Engineering biomechanically functional neocartilage derived from expanded articular chondrocytes through the manipulation of cell-seeding density and dexamethasone concentration

Brian J. Huang, Daniel J. Huey, Jerry C. Hu, Kyriacos A. Athanasiou

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Recent work has established methods to engineer self-assembled, scaffold-free neocartilage from an expanded articular chondrocyte (AC) cell source. In continuing such work, the objective of the present study was to investigate the effects of cell-seeding density and dexamethasone concentration on these neocartilage constructs. Neocartilage discs (5 mm diameter) were formed by self-assembling passaged leporine articular chondrocytes into non-adherent agarose moulds. The cell-seeding densities (2, 3, 4, 5 and 6 million cells/construct) and dexamethasone concentrations (10 and 100 nm) in the culture medium were varied in a full-factorial study. After 4 weeks, the neocartilage constructs were assessed for morphological, biochemical and biomechanical properties. The cell-seeding density profoundly affected neocartilage properties. The two dexamethasone concentrations explored did not induce overall significant differences. Constructs formed using lower cell-seeding densities possessed much higher biochemical and biomechanical properties than constructs seeded with higher cell densities. Notably, the 2 million cells/construct group formed hyaline-like neocartilage with a collagen wet weight (WW) content of ~7% and a Young's modulus of ~4 MPa, representing the high end of values achieved in self-assembled neocartilage. Excitingly, the mechanical properties of these constructs were on a par with that of native cartilage tissues tested under similar conditions. Through optimization of cell-seeding density, this study shows for the first time the use of expanded ACs to form homogeneous self-assembled neocartilage with exceptionally high tensile strength. With such functional properties, these engineered neocartilage constructs provide a promising alternative for treating articular lesions.

Original languageEnglish (US)
JournalJournal of Tissue Engineering and Regenerative Medicine
DOIs
StateAccepted/In press - 2016

Keywords

  • Cartilage
  • Cartilage repair
  • Cell density
  • Dexamethasone
  • Hyaline cartilage
  • Juvenile chondrocytes
  • Neocartilage
  • Tissue engineering

ASJC Scopus subject areas

  • Biomedical Engineering
  • Medicine (miscellaneous)
  • Biomaterials

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