Graphene Nanoribbon-Based Platform for Highly Efficacious Nuclear Gene Delivery.

Current efforts in the design and development of nonviral vectors for gene delivery and transfection have focused on the development of versatile agents that can load short or large sized genetic material, and are efficacious without eliciting toxicity in dividing and nondividing cells. Herein, we have investigated oxidized graphene nanoribbons (O-GNRs) as nonviral vectors for gene therapy and report in vitro studies that detail their cytotoxicity, intracellular and nuclear uptake, and gene delivery and transfection efficiencies. Our results indicate that, without additional functionalization with positively charged groups or other nonviral vectors, O-GNRs could load large amounts of small-sized single-stranded or large-sized double stranded genetic materials. O-GNRs at potential therapeutic doses (20-60 μg/mL) elicited lower cytotoxicity compared to widely used commercial nonviral gene delivery vectors (Polyethylenimine and Fugene 6). The O-GNR-plasmid DNA complexes showed uptake into vesicular structures of dividing Henrietta Lacks (HeLa) and nondividing Human umbilical vein endothelial cells (HUVEC), release into the cell's cytoplasm and entry into the nucleus. In these cells, O-GNRs loaded with enhanced green fluorescence protein (EGFP) plasmid or siRNA against glyceraldehyde-3-phosphate dehydrogenase (GAPDH) showed a concentration- and time- dependent increase in gene delivery and gene transfection efficiencies up to 96-98%. The results suggest that O-GNRs are promising candidates as versatile and efficient nonviral vectors of small- or large-sized genetic material in primary and secondary cell types for gene therapy.