Combination of 3D tissue engineered scaffold and non-viral gene carrier enhance in vitro DNA expression of mesenchymal stem cells

Biomaterials
Hossein HosseinkhaniYasuhiko Tabata

Abstract

The objective of this study is to enhance the expression of a plasmid DNA for mesenchymal stem cells (MSC) by combination of 3-dimensional (3D) tissue engineered scaffolds and non-viral gene carrier. As a carrier of plasmid DNA, dextran-spermine cationic polysaccharide was prepared by means of reductive-amination between oxidized dextran and the natural oligoamine, spermine. As the MSC scaffold, collagen sponges reinforced by incorporation of poly(glycolic acid) (PGA) fibers were used. A complex of the cationized dextran and plasmid DNA of BMP-2 was impregnated into the scaffolds. MCS were seeded into each scaffold and cultured by a 3D culture method. When MSC were cultured in the PGA-reinforced sponge, the level of BMP-2 expression was significantly enhanced by the cationized dextran-plasmid DNA complex impregnated into the scaffold than by the cationized dextran-plasmid DNA complex in 2-dimensional (2D) (tissue culture plate) culture method. The alkaline phosphatase activity and osteocalcin content of transfected MSC cultured in the PGA-reinforced sponge were significantly higher compared with 2D culture method. We conclude that combination of cationized dextran plasmid DNA complex and 3D tissue engineered scaffold was promis...Continue Reading

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