title: Biomacromolecules electrostatic self-assembly on 3-dimensional tissue engineering scaffold.
abstract: A poly(ethylenimine) (PEI) was employed to obtain a stable positively charged surface on a poly(D,L-lactide) (PDL-LA) tissue engineering scaffold. An extracellular matrix (ECM)-like biomacromolecule, gelatin, was selected as polyelectrolyte and deposit alternately with PEI on the activated PDL-LA scaffold via ESA technique. The zeta-potential result showed alternating charge of polyelectrolytes (PEI/gelatin) layering on PDL-LA microspheres. Quartz crystal microbalance (QCM) measurement further verified the gradual deposition of PEI/gelatin on the PDL-LA thin film. The combination of PEI aminolysis and the layer-by-layer technique was then explored to construct gelatin coating onto the 3-D porous PDL-LA scaffold. Scanning electronic microscopy showed that there is no notable difference between modified and unmodified PLA scaffolds, with regard to the porosity, pore diameter, and scaffold integration. The dual-tunnel confocal laser scanning microscopy indicated uniform gelatin distribution on the inner surface of the 3-D porous scaffold. The gradual build-up of protein layer on scaffold was investigated by radioiodination technique. Chondrocyte was chosen to test the cell behavior on modified and unmodified PDL-LA scaffolds. The results of the cell viability, total intracellular protein content, and cell morphology on the PEI/gelatin multilayers modified PDL-LA scaffold showed to promote chondrocyte growth. Comparing conventional coating methods, polyelectrolyte multilayers are easy and stable to prepare. It may be a promising choice for the surface modification of complex biomedical devices. These very flexible systems allow broad medical applications for drug delivery and tissue engineering.
authors.affiliation: Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027 China.
authors.forename: Huiguang
authors.initials: H
authors.lastname: Zhu
authors.forename: Jian
authors.initials: J
authors.lastname: Ji
authors.forename: Jiacong
authors.initials: J
authors.lastname: Shen
mesh_terms: D000818:Animals; D019902:Chondrocytes / Q000737:chemistry; D046911:Macromolecular Substances / Q000737:chemistry*; D011817:Rabbits; D055672:Static Electricity; D040681:Structural Homology, Protein; D023822:Tissue Engineering / Q000379:methods*
chemical_list: D046911:Macromolecular Substances