Neurite outgrowth and synaptophysin expression of postnatal CNS neurons on GaP nanowire arrays in long-term retinal cell culture

• Published in: Biomaterials Vol. 34; no. 4; pp. 875 - 887
• Main Authors: Piret, Gaëlle, Perez, Maria-Thereza, Prinz, Christelle N
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier Ltd 01-01-2013
• Subjects: Advanced Basic Science; Animals; Animals, Newborn; Arrays; Batch Cell Culture Techniques - methods; Bioengineering Equipment; Biomedical materials; Biomolecules; Bioteknisk apparatteknik; Cell Proliferation; Cell Survival; Cells, Cultured; CNS; Culture; Dentistry; Engineering and Technology; Gallium - chemistry; Gallium phosphides; Glia; Industrial Biotechnology; Industriell bioteknik; Materials Testing; Mice; Nanotopography; Nanotubes - chemistry; Nanotubes - ultrastructure; Nanowires; Neurites - physiology; Neuron; Neurons; Phosphines - chemistry; Retina; Retinal cells; Retinal Neurons - cytology; Retinal Neurons - physiology; Surgical implants; Synaptophysin - metabolism; Teknik; Tissue Scaffolds; Nanotopography; CNS; Retina; Neuron; Nanowires; Glia
• ISSN: 0142-9612; 1878-5905; 1878-5905
• DOI: 10.1016/j.biomaterials.2012.10.042

Abstract We have established long-term cultures of postnatal retinal cells on arrays of gallium phosphide nanowires of different geometries. Rod and cone photoreceptors, ganglion cells and bipolar cells survived on the substrates for at least 18 days in vitro . Glial cells were also observed, but these did not overgrow the neuronal population. On nanowires, neurons extended numerous long and branched neurites that expressed the synaptic vesicle marker synaptophysin. The longest nanowires (4 μm long) allowed a greater attachment and neurite elongation and our analysis suggests that the length of the nanowire per se and/or the adsorption of biomolecules on the nanowires may have been important factors regulating the observed cell behavior. The study thus shows that CNS neurons are amenable to gallium phosphide nanowires, probably as they create conditions that more closely resemble those encountered in the in vivo environment. These findings suggest that gallium phosphide nanowires may be considered as a material of interest when improving existing or designing the next generation of implantable devices. The features of gallium phosphide nanowires can be precisely controlled, making them suitable for this purpose.