Non-viral delivery of the gene for glial cell line-derived neurotrophic factor to mesenchymal stem cells in vitro via a collagen scaffold

Tissue Engineering. Part C, Methods
Catherine BollietMyron Spector

Abstract

Recent advances in tissue engineering that combine an extracellular matrix-like scaffold with therapeutic molecules, cells, DNA encoding therapeutic proteins, or a combination of the three hold promise for treating defects in the brain resulting from a penetrating injury or tumor resection. The purpose of this study was to investigate a porous sponge-like collagen scaffold for non-viral delivery of a plasmid encoding for glial cell line-derived neurotrophic factor (pGDNF) to rat marrow stromal stem cells (also referred to as mesenchymal stem cells, MSCs). The effects of the following parameters on GDNF synthesis in the three-dimensional (3D) constructs were evaluated and compared with results in monolayer culture: initial plasmid load (2-50 microg pGDNF), ratio of a lipid transfection reagent to plasmid (5:10), culture environment during the transfection (static and dynamic), and cell density. The level of gene expression in the collagen scaffolds achieved therapeutic levels that had previously been found to support survival of dopaminergic and trigeminal neurons in vitro. For the highest loading of plasmid (50 microg), the level of GDNF protein remained six to seven times above the control level after 2 weeks, a significant di...Continue Reading

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