title: Tissue engineering of cartilage with the use of chitosan-gelatin complex scaffolds.
abstract: Chitosan has been shown to be a promising scaffold for various applications in tissue engineering. In this study, a chitosan-gelatin complex was fabricated as a scaffold by a freezing and lyophilizing technique. Chitosan's structure and characteristics are similar to those of glycosaminoglycan (GAG) and its analogs, and possesses various biological activities, whereas gelatin can serve as a substrate for cell adhesion, differentiation, and proliferation. With the use of autologous chondrocytes isolated from pig's auricular cartilage and seeded onto the chitosan-gelatin scaffold, elastic cartilages have been successfully engineered at the porcine abdomen subcutaneous tissue. After 16 weeks of implantation, the engineered elastic cartilages have acquired not only normal histological and biochemical, but also mechanical properties. The tissue sections of the engineered elastic cartilages showed that the chondrocytes were enclosed in the lacuna, similar to that of native cartilage. The presence of elastic fibers in the engineered cartilages was also demonstrated by Vehoeff's staining, and immunohistochemical staining confirmed the presence of type II collagen in the engineered cartilages. Quantitatively, the GAG in the engineered cartilages reached 90% of the concentration in native auricular cartilage. Furthermore, biomechanical analysis demonstrated that the extrinsic stiffness of the engineered cartilages reached 85% of the level in native auricular cartilage when it was harvested at 16 weeks. Thus, this study demonstrated that the chitosan-gelatin complex may serve as a suitable scaffold for cartilage tissue engineering.
authors.affiliation: Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Second Medical University, People's Republic of China.
authors.forename: Wanyao
authors.initials: W
authors.lastname: Xia
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.forename: Lei
authors.initials: L
authors.lastname: Cui
authors.forename: Yuanchun
authors.initials: Y
authors.lastname: Liu
authors.forename: Wei
authors.initials: W
authors.lastname: Zhong
authors.forename: Deli
authors.initials: D
authors.lastname: Liu
authors.forename: Juanjuan
authors.initials: J
authors.lastname: Wu
authors.forename: Kienhui
authors.initials: K
authors.lastname: Chua
authors.forename: Yilin
authors.initials: Y
authors.lastname: Cao
mesh_terms: D000818:Animals; D001672:Biocompatible Materials; D001696:Biomechanical Phenomena; D002356:Cartilage; D048271:Chitosan; D019902:Chondrocytes / Q000187:drug effects; D005612:Freeze Drying; D005615:Freezing; D005780:Gelatin; D006025:Glycosaminoglycans / Q000378:metabolism; D007150:Immunohistochemistry; D008422:Materials Testing; D013552:Swine; D023822:Tissue Engineering / Q000379:methods*
chemical_list: D001672:Biocompatible Materials; D006025:Glycosaminoglycans; D005780:Gelatin; D048271:Chitosan