title: Enhancement of adipose-derived stem cell differentiation in scaffolds with IGF-I gene impregnation under dynamic microenvironment.
abstract: Biochemical and mechanical signals enabling cardiac regeneration can be elucidated by using in vitro tissue engineering models. We hypothesized that human insulin-like growth factor-I (IGF-I) and 3-dimensional (3D) dynamic microenvironment could enhance the survival and differentiation of adipose tissue-derived stem cells (ADSCs). In this study, ADSCs were cultured on 3D porous scaffolds with or without plasmid DNA PIRES2-IGF-I in cardiac media, in static culture dishes, and in a spinning flask bioreactor, respectively. Cell viability, formation of cardiac-like structure, expression of functional proteins, and gene expressions were tested in the cultured constructs on day 14. The results showed that dynamic microenvironment enhanced the release of plasmid DNA; the ADSCs can be transfected by the released plasmid DNA PIRES2-IGF-I in scaffold. IGF-I showed beneficial effects on cellular viability and increase of total protein and also increased the expressions of cardiac-specific proteins and genes in the grafts. It was also demonstrated that dynamic stirring environment could promote the proliferation of ADSCs. Therefore, IGF-I, expressed by ADSCs transfected by DNA PIRES2-IGF-I incorporated into scaffold, and hydrodynamic microenvironment can independently and interactively increase cellular viability and interactively increase the expression of cardiac-specific proteins and genes in the grafts. The results would be useful for developing tissue-engineered grafts for myocardial repair.
authors.affiliation: Dalian R&D Center for Stem Cell and Tissue Engineering, Dalian University of Technology, Dalian, China.
authors.forename: Yanxia
authors.initials: Y
authors.lastname: Zhu
authors.forename: Tianqing
authors.initials: T
authors.lastname: Liu
authors.forename: Hua
authors.initials: H
authors.lastname: Ye
authors.forename: Kedong
authors.initials: K
authors.lastname: Song
authors.forename: Xuehu
authors.initials: X
authors.lastname: Ma
authors.forename: Zhanfeng
authors.initials: Z
authors.lastname: Cui
mesh_terms: D000273:Adipose Tissue / Q000166:cytology*; D015415:Biomarkers / Q000378:metabolism; D002454:Cell Differentiation / Q000502:physiology*; D006801:Humans; D007334:Insulin-Like Growth Factor I / Q000235:genetics* / Q000378:metabolism; D010957:Plasmids / Q000235:genetics / Q000378:metabolism; D013234:Stem Cells / Q000166:cytology / Q000502:physiology*; D023822:Tissue Engineering / Q000379:methods*; D054457:Tissue Scaffolds
chemical_list: D015415:Biomarkers; D007334:Insulin-Like Growth Factor I