Gene delivery by surface immobilization of plasmid to tissue-engineering scaffolds.
Gene Ther
; 17(9): 1134-41, 2010 Sep.
Article
em En
| MEDLINE
| ID: mdl-20485383
ABSTRACT
Biomaterial scaffolds that serve as vehicles for gene delivery to promote expression of inductive factors have numerous regenerative medicine applications. In this report, we investigate plasmid delivery from biomaterial scaffolds using a surface immobilization strategy. Porous scaffolds were fabricated from poly(D,L-lactide-co-glycolide) (PLG), and plasmids were immobilized by drying. In vitro plasmid release indicated that the majority (>70%) of adsorbed plasmids were released within 24 h and >98% within 3 days; however, in vivo implantation of the scaffolds at the subcutaneous site yielded transgene expression that persisted for at least 28 weeks and was localized to the site of implantation. Histological analysis of DNA-adsorbed scaffolds indicated that macrophages at the scaffold were transfected in the first 2 weeks after implantation, whereas muscle cells adjacent to the implant primarily expressed the transgene at 4 weeks. In addition to localized gene expression, a secreted protein (human factor IX) was retained at the implant site and not available systemically after 3 days, indicating minimal off-target effects. These findings show that surface immobilization of plasmid onto microporous PLG scaffolds can produce localized and long-term gene expression in vivo, which may be used to enhance the bioactivity of scaffolds used for regenerative medicine.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Plasmídeos
/
Técnicas de Transferência de Genes
/
Alicerces Teciduais
Limite:
Humans
Idioma:
En
Ano de publicação:
2010
Tipo de documento:
Article