Cartilage tissue engineering on fibrous chitosan scaffolds produced by a replica molding technique

The biocompatibility of chitosan and its similarity with glycosaminoglycans make it attractive as a scaffold for cartilage engineering. Fibrous scaffolds may simulate cartilage extracellular matrix structure and promote chondrocyte functions. Our objectvies were to produce chitosan fibers of different size and evaluate their potential for chondrogenesis. A novel replica molding technique was developed to produce chitosan nonwoven scaffolds made of fiber measuring 4, 13, or 22 mu m in width. A polyglycolic acid mesh (PGA) served as a reference group. Controls were analyzed 48 h after seeding porcine chondrocytes via scanning electron microscopy (SEM), DNA, and glycosaminoglycan (GAG) quantifications. constructs were cultured for 21 days prior to confocal microscopy, SEM, histology, and quantitive analysis (weight, water, DNA, GAG and collagen II). Chondrocytes maintained their phenotypic appearance and a viability above 85% oil the chitosan scaffolds. Chondrocytes attach preferentially to PGA, resulting in a greater cellularity of these constructs. However, based oil the GAG/DNA and Collagen II/DNA ratios, matrix production per chondrocyte was improved ill chitosan Constructs, especially on smaller fibers. The differences between PGA and chitosan are more likely to result from the chemical composition rather than their structural characteristics. Although chitosan appears to promote matrix formation, further Studies should be aimed at improving its cell adhesion properties. (C) 2009 Wiley Periodicals, Inc. I Biomed Mater Res 93A: 46-55, 2010