Nanospider-Generated Polyamide 6 Scaffolds Nanostructured with Graphene Oxide for Enhanced Cell Adhesion and Tissue...

Graphene oxide (GO)-based nanostructured biomaterials have emerged as promising platforms for tissue engineering due to their novel biointeractive properties. In this study, we developed polyamide 6 (PA6) scaffolds by electrospinning using the Nanospider technique. Unlike conventional laboratory-scale electrospinning systems, Nanospider™ employs a wire-based electrode coated with a thin layer of polymer solution, from which nanofibers are continuously generated under a high-voltage electric field, enabling the large-scale fabrication of scaffolds. The scaffolds were then nanostructured with GO to investigate the effect of surface modification on their physicochemical properties, and biological responses. Surface characterization demonstrated that GO incorporation altered the microtexture of PA6 scaffolds, leading to changes in topographical parameters and surface morphology. In vitro studies performed using human stromal HS-5 cells confirmed high cytocompatibility of both GO nanofilms and PA6-GO composites, with preserved metabolic activity and enhanced cell adhesion. Scanning electron microscopy revealed improved spreading, elongated morphology, and increased filopodia formation on GO-modified scaffolds. Gene expression analyses indicated modulation of mechanotransduction- and adhesion-related pathways, including differential regulation of FN1, FAK, and integrin-associated genes, suggesting that GO nanostructuring influences early cell-material interactions through combined effects on surface architecture and chemistry. Ex vivo studies using embryonic tissues derived from chicken embryo Gallus gallus demonstrated effective colonization of connective, cartilage, and bone tissues on GO-modified scaffolds. Collectively, these findings demonstrate that GO nanostructuring of electrospun PA6 scaffolds improves biointerface formation, supports mechanobiological adaptation, and promotes tissue development, highlighting the potential for regenerative medicine.