title: Effect of scaffold architecture and pore size on smooth muscle cell growth.
abstract: Tissue engineering has the potential to replace damaged tissues and organs. Diffusion limitation of cell growth in three-dimensional (3D) scaffolds is a significant constraint in most tissue engineering applications. This study describes a scaffold architecture that improves mass transfer. Scaffolds with three different geometries of villi architecture (0.5, 1, 0.5; 0.5, 1, 1; 1, 1, 1 mm; villus diameter, height, intervillus spacing, respectively) were fabricated by indirect 3D printing technique. The ability of these scaffolds to support smooth muscle cell growth was investigated in vitro. Smooth muscle cells attached to the scaffolds uniformly after 1 day of culture, and the cell density in the scaffold with small villi feature (0.5 mm) was significantly higher as compared to that for the scaffold with large villi features (1 mm) after 14 days of culture. To evaluate the effect of scaffold pore size on cell growth, scaffolds with three different pore size ranges (50-100, 100-150, and 150-200 microm) were fabricated by the solvent casting and particulate leaching technique. Scaffold pore size did not significantly affect cell growth after 14 days of culture. Optimization in the architectural design of scaffolds provides an alternative method to improve diffusion limitation in the 3D constructs.
authors.affiliation: Department of Bioengineering, University of California, Los Angeles, California 90095, USA.
authors.forename: Min
authors.initials: M
authors.lastname: Lee
authors.forename: Benjamin M
authors.initials: BM
authors.lastname: Wu
authors.forename: James C Y
authors.initials: JC
authors.lastname: Dunn
mesh_terms: D000818:Animals; D001672:Biocompatible Materials / Q000737:chemistry*; D049109:Cell Proliferation; D002478:Cells, Cultured; D019344:Lactic Acid / Q000737:chemistry; D008422:Materials Testing; D032389:Myocytes, Smooth Muscle / Q000166:cytology / Q000502:physiology*; D011100:Polyglycolic Acid / Q000737:chemistry; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D016062:Porosity; D013499:Surface Properties; D023822:Tissue Engineering / Q000295:instrumentation / Q000379:methods; D054457:Tissue Scaffolds
chemical_list: D001672:Biocompatible Materials; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid