Niobium Carbide MXene Augmented Medical Implant Elicits Bacterial Infection Elimination and Tissue Regeneration.

Abstract

Incurable bacterial infections, impenetrable microbial biofilm, and irreversible antibiotic resistance are among the most dangerous threats for humans. With few effective strategies available in antimicrobial and antibiofilm development, innovative methodologies inspired by the advances in other fields such as nanomedicine are becoming more and more attractive to realize innovative antibacterial agents. Herein, a 2D niobium carbide (Nb2C) MXene titanium plate (Nb2C@TP)-based clinical implant with practical multimodal anti-infection functions was developed. Such emerging modes are capable of destroying biofilms for direct bacteria elimination through down-regulating bacterial energy metabolism pathways, suppressing biofilm formation, and enhancing as-formed biofilm detachment via an activating accessory gene regulator. Another intriguing feature of this nanomedicine is the sensitization ability toward bacteria via photothermal transduction, which reduces the temperature necessary for bacteria eradication and mitigates possible normal tissue damage. Moreover, the Nb2C@TP medical implant is able to alleviate proinflammatory responses by scavenging excessive reactive oxygen species in infectious microenvironments, benefiting angiogenesis and tissue remodeling.