Hybrid fibrous architectures-mediated gene transfer by pDNA nanoparticles into macrophages.

Gene therapy is one of the most potential therapeutic approaches in direct and specific regulation of biological functions of macrophages at the gene level for efficient cell therapy. However, the delivery of genetic material to macrophages is extremely challenging, because of low stability, specificity and inability of therapeutic genes to efficiently enter the cells. Here, we present a method that uses the hybrid electrospun architectures based on gelatin-alginate decorated with carboxylated graphene oxide (HAG/G) as efficient substrate for loading and local and controlled delivery of plasmid DNA (pDNA) to macrophages as an alternative to systemic gene delivery carriers. Polyethyleneimine (PEI) is employed to assemble PEI/pDNA nanoparticles (Np) - used as model of carrier. The dispersion of GO-COOH sheets shifts the surface zeta potential of HAG/G to high negative value (SZP = -16.8 ± 2.21 mV) and further increases the encapsulation efficiency of PEI/pDNA Np onto hybrid HAG/G electrospun architectures to ∼ 69 % (HAG/G-Np). The biological investigations show a good metabolic activity of macrophages seeded onto HAG/G-Np (MTT assay), while gene expression experiments (fluorescent microscopy) show a 30 % increase in transient gene transfection of cells cultured in the presence of HAG/G-Np as compared to those incubated with free PEI/pDNA Np.