Gold–silver nanoshells promote wound healing from drug-resistant bacteria infection and enable monitoring via surface-enhanced Raman scattering imaging

Jian He, Yue Qiao, Hongbo Zhang, Jun Zhao, Wanli Li, Tingting Xie, Danni Zhong, Qiaolin Wei, Shiyuan Hua, Yinhui Yu, Ke Yao, Hélder A. Santos, Min Zhou

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Chronic infections, caused by multidrug-resistant (MDR) bacteria, constitute a serious problem yet often underappreciated in clinical practice. The in situ monitoring of the bacteria-infected disease is also necessary to track and verify the therapeutic effect. Herein we present a facile approach to overcome the above challenges through a Raman tag 3,3′-diethylthiatricarbocyanine iodide (DTTC)-conjugated gold-silver nanoshells (AuAgNSs). With a strong responsive of the near-infrared laser due to surface plasmon resonance (SPR) from hybrid metallic nanoshell structure, AuAgNSs exhibits an efficient photothermal effect, and it simultaneously releases silver ions during laser irradiation to bacterial eradicate. Herein, two MDR bacteria strain, methicillin-resistant Staphylococcus aureus (MRSA) and extended-spectrum β-lactamase Escherichia coli, are chosen as models and studied both in vitro and in vivo. As a result, the AuAgNSs-DTTC substrates enable surface-enhanced Raman scattering imaging to provide a non-invasive and extremely high sensitive detection (down to 300 CFU mL−1 for MRSA) and prolonged tracking (at least 8 days) of residual bacteria. In a chronic MRSA-infected wound mouse model, the AuAgNSs gel-mediated photothermal therapy/silver-release leads to a synergistic would healing with negligible toxicity or collateral damage to vital organs. These results suggest that AuAgNSs-DTTC is a promising anti-bacterial tool for clinical translation.
Original languageEnglish
Article number119763
JournalBiomaterials
Volume234
Number of pages12
ISSN0142-9612
DOIs
Publication statusPublished - Mar 2020
MoE publication typeA1 Journal article-refereed

Fields of Science

  • ERADICATION
  • Gold-silver nanoshells
  • Multidrug-resistant bacteria
  • NANOPARTICLES
  • PSEUDOMONAS-AERUGINOSA
  • Photothermal therapy
  • REPLACEMENT REACTION
  • SERS
  • THERAPY
  • TOXICITY
  • Wound healing
  • 1182 Biochemistry, cell and molecular biology
  • 317 Pharmacy
  • 221 Nano-technology

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