Bioorthogonal Mussel-Inspired Elastin-like Nanocoatings for Indwelling Devices

Medical devices such as vascular grafts, stents, and catheters are crucial for patient treatment but often suffer suboptimal integration with host tissues due to the nature of their surfaces. The materials commonly used, including metals and synthetic polymers, frequently lead to undesired immune responses and device failure. In this context, coating their surfaces with designer proteins has arisen as a promising strategy to improve the device's biointegration. Here, we present a bioinspired method for coating biomaterial surfaces with protein-engineered polymers designed to mimic tailored functions from the native extracellular matrix (ECM). Combining mussel-inspired catechol chemistry with bioorthogonal click chemistry, we developed a modular grafting method for the surface functionalization of metallic and polymeric implants using a bifunctional peptide containing azide and DOPA (3,4-dihydroxyphenylalanine) groups. This simple dip-coating process enabled the fabrication of bioactive elastin-like coatings with precise peptide presentation. The results reveal enhanced bioactivity and cytocompatibility, as evidenced by improved endothelial cell adhesion, proliferation, and heparin-binding capacity on coated surfaces. The versatility and effectiveness of this bioorthogonal coating method suggest significant potential for creating implant surfaces tailored to diverse clinical applications.