ROS-responsive H<sub>2</sub>S-releasing quaternized chitosan dental implant coating for improved soft tissue integration, antibacterial and immunomodulatory capacities.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 42666621.
- Also identified by DOI 10.1016/j.bioactmat.2026.07.056 and PMC identifier 13522379.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Early and stable soft tissue integration is a prerequisite for the long-term success of dental implants. Crucially, the formation of this biological seal is closely associated with bacterial invasion and the modulation of the local immune microenvironment. Herein, we developed a reactive oxygen species (ROS)-responsive hydrogen sulfide (H<sub>2</sub>S)-releasing quaternized chitosan (QCS) coating on the transmucosal interface of Ti-6Al-4V implants, termed TC4/PQCS/H<sub>2</sub>S. This coating exhibited favorable biocompatibility, enhancing the adhesion of human gingival epithelial cells (HGECs) and human gingival fibroblasts (HGFs), and improving soft tissue compatibility. Additionally, the TC4/PQCS/H<sub>2</sub>S possessed potent antibacterial activity against <i>Escherichia coli</i>, methicillin-resistant <i>Staphylococcus aureus</i>, and oral anaerobic pathogens, with effective suppression of biofilm formation. Furthermore, the TC4/PQCS/H<sub>2</sub>S enhanced cellular antioxidant defense and activated the Nrf2 pathway. It also promoted macrophage polarization toward the pro-healing M2 phenotype, with the involvement of the PI3K-Akt signaling pathway. Overall, this study presents an efficient surface modification strategy that integrates cell-adhesive, antibacterial, antioxidant, and immunomodulatory functions, demonstrating great potential for soft tissue integration.