Nanofunctionalisation for the treatment of peripheral nervous system injuries.

A construct based on the electrostatic layer-by-layer self assembly technique has been fabricated, to be used as a tailored device to encourage nerve regeneration. A multilayered nanocoating composed of three precursor bilayers of cationic poly(dimethyldiallylammonium) chloride (PDDA) and anionic poly(styrenesulfonate) (PSS), followed by bilayers of poly-D-lysine (PDL) and antibody specific to transforming growth factor 1 (anti-TGF-1), has been deposited on HYAFF 11. The assembly process has been monitored by quartz crystal microbalance (QCM) for its characterisation and then it has been used on HYAFF 11. Structural studies of the resulting multilayers confirmed stepwise deposition of anti-TGF-1, with an average layer thickness of 2.2+/-0.2 nm and an average surface density of 0.36+/-0.03 mug cm(-2). Scanning electron microscopy has been used to characterise multilayer uniformity. Finally, the immunological activity of the multilayered structure has been assessed. The results show that anti-TGF-1 can be included in its active form in a predetermined multilayered structure onto HYAFF 11 with quantitative control of layer thickness and weight, providing a high tool with great potential in tissue engineering.