The application of POSS nanostructures in cartilage tissue engineering: the chondrocyte response to nanoscale geometry

Despite extensive research into cartilage tissue engineering (CTE), there is still no scaffold ideal for clinical applications. Various synthetic and natural polymers have been investigated in vitro and in vivo, but none have reached widespread clinical use. The authors investigate the potential of POSS–PCU, a synthetic nanocomposite polymer, for use in CTE. POSS–PCU is modified with silsesquioxane nanostructures that improve its biological and physical properties. The ability of POSS–PCU to support the growth of ovine nasoseptal chondrocytes was evaluated against a polymer widely used in CTE, polycaprolactone (PCL). Scaffolds with varied concentrations of the POSS molecule were also synthesized to investigate their effect on chondrocyte growth. Chondrocytes were seeded onto scaffold disks (PCU negative control; POSS–PCU 2%, 4%, 6%, 8%; PCL). Cytocompatibilty was evaluated using cell viability, total DNA, collagen and GAG assays. Chondrocytes cultured on POSS–PCU (2% POSS) scaffolds had significantly higher viability than PCL scaffolds (p 0.05). POSS–PCU (6% and 8% POSS) had improved viability and proliferation over an 18 day culture period compared with 2% and 4% POSS–PCU (p