A Photo‐Therapeutic Nanocomposite with Bio‐Responsive Oxygen Self‐Supplying Combats Biofilm Infections and Inflammation from Drug‐Resistant Bacteria

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Abstract
The use of non‐antibiotic strategies to combat refractory drug‐resistant bacterial infections, especially biofilms and accompanying inflammation, has recently aroused widespread interest. Herein, a photo‐therapeutic nanocomposite with bio‐responsive oxygen (O2) self‐supplying is introduced by integrating manganese dioxide (MnO2) nanozymes onto photosensitizer (indocyanine green, ICG)‐loaded mesoporous polydopamine nanoparticles (MPDA), namely MI‐MPDA NPs. MI‐MPDA can activate O2 generation in the infection microenvironment, thereby effectively alleviating biofilm hypoxia. Under near‐infrared light (NIR) irradiation, continuous O2 supplying further boosts the level of singlet oxygen (1O2), enabling robust biofilm elimination through O2‐potentiated photodynamic/photothermal therapy. Interestingly, MI‐MPDA down‐regulates the factor expression of inflammatory signaling pathways through MnO2‐mediated reactive oxygen species scavenging, which ameliorates the inflammatory condition. Meanwhile, O2 supplying prevents the M1‐phenotype switch of macrophages from the overexpression of hypoxia‐inducible factor‐1α (HIF‐1α), thereby prompting macrophage reprogramming toward pro‐regenerative M2‐phenotype. In the mouse models of subcutaneous implant‐associated infection caused by methicillin‐resistant Staphylococcus aureus (MRSA) biofilms and burn infection caused by Pseudomonas aeruginosa biofilms, NIR‐irradiated MI‐MPDA not only effectively eliminates the formed biofilms, but also alleviates the oxidative stress and accompanying inflammation, and drives the cascade reaction of immunomodulation‐wound healing. Overall, this O2‐potentiated photo‐therapeutic strategy provides a reliable tool for combating biofilm infections and inflammation from drug‐resistant bacteria.
Funding Information
  • National Natural Science Foundation of China (32101083, 51825302)
  • Natural Science Foundation of Chongqing Municipality (cstc2021jcyj‐cxttX0002, CSTB2022NSCQ‐MSX1323)
  • Fundamental Research Funds for the Central Universities (G2022WD01004)

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