A Self-Cascading Immunomodulatory Hydrogel for Remodeling Infected Diabetic Wounds.
basic_science · Level V
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- Record sourced from PubMed, PMID 42226495.
- Also identified by DOI 10.1002/adma.73560.
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Abstract
Methicillin-resistant Staphylococcus aureus (MRSA)-infected diabetic foot ulcers (DFUs) remain refractory to healing owing to persistent inflammation, hyperglycemia, and impaired tissue regeneration. Current antimicrobial strategies primarily eliminate viable bacteria but overlook pathogen-associated molecular patterns (PAMPs) released upon bacterial death, which sustain NF-κB/NLRP3 activation and prevent immune resolution. However, suppressing microbial burden without neutralizing PAMP-driven inflammation fails to restore the regenerative wound microenvironment. Here, we report a self-cascading hypoglycemic immunomodulatory hydrogel integrating Fe<sub>3</sub>O<sub>4</sub>@Au nanozymes with phenylboronic acid-modified hyaluronic acid and dopamine-functionalized silk fibroin. The platform exploits endogenous glucose to drive cascade catalysis for efficient MRSA eradication (∼99.99% with near-infrared assistance), while dynamically exposing catechol and boronic acid motifs to sequester PAMPs and suppress inflammatory signaling. Consequently, macrophages are reprogrammed from pro-inflammatory M1 to pro-healing M2 phenotypes, enabling immune microenvironment remodeling. In MRSA-infected DFU models, this coordinated antibacterial-immunomodulatory strategy markedly accelerates wound closure, leaving only ∼13.97% residual area after 14 days. These results establish a design paradigm that couples biocatalysis with immune regulation for treating complex infected wounds.