D-amino acid RGD mimic hydrogels accelerate MRSA-infected wound closure and boost antimicrobial efficacy

Effective treatment for infected wounds, especially those involving antibiotic-resistant strains like methicillin-resistant Staphylococcus aureus (MRSA), remains a significant clinical challenge. Current wound dressings often lack the dual capacity to actively promote tissue regeneration while simultaneously combating infection. This gap necessitates innovative biomaterials that can provide both a supportive scaffold for healing and potent antimicrobial properties. Peptides, particularly those designed to mimic extracellular matrix components like RGD sequences, offer a promising avenue, but their stability and specific bioactivity in complex wound environments need optimization.

Researchers synthesized a novel series of D-amino acid and D/L-hybrid peptide analogs, which self-assembled into nanofibrous hydrogels. These hydrogels were designed as injectable, biomimetic scaffolds. Molecular docking studies were performed to assess binding affinities, revealing strong interaction of AN2D3 peptide with integrin αvβ3. The peptides were systematically evaluated in MRSA-infected Balb/c mice to assess their antimicrobial activity, mechanical integrity, and regenerative potential. The study investigated how increasing D-amino acid content influenced these therapeutic outcomes.

The study found a direct correlation between increased D-amino acid content within the peptide sequences and improved antimicrobial efficacy, alongside enhanced wound-healing capabilities. Molecular docking identified AN2D3 peptide as having the strongest binding affinity toward integrin αvβ3, suggesting its potential for targeting αvβ3-mediated pathways crucial for cell adhesion and proliferation. This strong binding likely contributes to its superior performance. Among all tested peptide sequences, AN2D3 consistently yielded the best results in promoting wound closure and inhibiting MRSA infection. These hydrogels were specifically engineered to resist enzymatic degradation, a common issue with peptide-based biomaterials, while actively promoting beneficial interactions with the extracellular matrix and exhibiting innate antimicrobial activity. > The AN2D3 peptide hydrogel demonstrated superior performance, highlighting the critical role of stereochemistry in optimizing peptide-based constructs for dual wound healing and antimicrobial functions.