Aptamers as novel binding molecules on an antimicrobial peptide-armored composite hydrogel wound dressing for specific removal and efficient eradication of …

M Kraemer, M Bellion, AK Kissmann… - International Journal of …, 2023 - mdpi.com
M Kraemer, M Bellion, AK Kissmann, T Herberger, CV Synatschke, A Bozdogan
International Journal of Molecular Sciences, 2023mdpi.com
Here we present for the first time a potential wound dressing material implementing
aptamers as binding entities to remove pathogenic cells from newly contaminated surfaces
of wound matrix-mimicking collagen gels. The model pathogen in this study was the Gram-
negative opportunistic bacterium Pseudomonas aeruginosa, which represents a
considerable health threat in hospital environments as a cause of severe infections of burn
or post-surgery wounds. A two-layered hydrogel composite material was constructed based …
Here we present for the first time a potential wound dressing material implementing aptamers as binding entities to remove pathogenic cells from newly contaminated surfaces of wound matrix-mimicking collagen gels. The model pathogen in this study was the Gram-negative opportunistic bacterium Pseudomonas aeruginosa, which represents a considerable health threat in hospital environments as a cause of severe infections of burn or post-surgery wounds. A two-layered hydrogel composite material was constructed based on an established eight-membered focused anti-P. aeruginosa polyclonal aptamer library, which was chemically crosslinked to the material surface to form a trapping zone for efficient binding of the pathogen. A drug-loaded zone of the composite released the C14R antimicrobial peptide to deliver it directly to the bound pathogenic cells. We demonstrate that this material combining aptamer-mediated affinity and peptide-dependent pathogen eradication can quantitatively remove bacterial cells from the “wound” surface, and we show that the surface-trapped bacteria are completely killed. The drug delivery function of the composite thus represents an extra safeguarding property and thus probably one of the most important additional advances of a next-generation or smart wound dressing ensuring the complete removal and/or eradication of the pathogen of a freshly infected wound.
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