Sacrificing Knight for Pawn-Queen Promotion: Sonosensitive Nano-Xanthiums Orchestrate NO to Retain H₂O₂ for Antibiofilm Therapy.

Abstract

Biofilm infections present escalating clinical challenges due to their intrinsic resistance to conventional treatments, underscoring the urgent need for innovative therapeutic strategies. Here, we show a pioneering approach that leverages sacrificial nitric oxide (NO) to enhance hydrogen peroxide (H₂O₂) retention for antibiofilm therapy. H₂O₂ has the ability to produce hydroxyl radicals (•OH), the most potent oxidants in nature, but it is often neutralized by H₂O₂ scavengers before •OH formation. Our design utilizes ultrasound irradiation to release NO from the biofilm-anchoring nano-xanthiums (G-B@NXs), which subsequently interact with biofilm-associated H₂O₂ scavengers, including catalase and glutathione, to suppress the decomposition ability toward H₂O₂. Additionally, glucose oxidase on the surface of G-B@NXs supplements H₂O₂ production, facilitates its conversion into •OH, and exhibits effective biofilm sterilization in different infection models. Our strategy not only shows the promise for advancing antibiofilm applications but also provides novel insights into the development of NO-assisted biomaterials.