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Type: Journal article
Title: Taking the silver bullet colloidal silver particles for the topical treatment of biofilm-related infections
Author: Richter, K.
Facal, P.
Thomas, N.
Vandecandelaere, I.
Ramezanpour, M.
Cooksley, C.
Prestidge, C.
Coenye, T.
Wormald, P.
Vreugde, S.
Citation: ACS Applied Materials and Interfaces, 2017; 9(26):21631-21638
Publisher: American Chemical Society
Issue Date: 2017
ISSN: 1944-8244
Statement of
Katharina Richter, Paula Facal, Nicky Thomas, Ilse Vandecandelaere, Mahnaz Ramezanpour, Clare Cooksley, Clive A. Prestidge, Tom Coenye, Peter-John Wormald and Sarah Vreugde
Abstract: Biofilms are aggregates of bacteria residing in a self-assembled matrix, which protects these sessile cells against external stress, including antibiotic therapies. In light of emerging multidrug-resistant bacteria, alternative strategies to antibiotics are emerging. The present study evaluated the activity of colloidal silver nanoparticles (AgNPs) of different shapes against biofilms formed by Staphylococcus aureus (SA), methicillin-resistant SA (MRSA), and Pseudomonas aeruginosa (PA). Colloidal quasi-spherical, cubic, and star-shaped AgNPs were synthesized, and their cytotoxicity on macrophages (THP-1) and bronchial epithelial cells (Nuli-1) was analyzed by the lactate dehydrogenase assay. The antibiofilm activity was assessed in vitro by the resazurin assay and in an in vivo infection model in Caenorhabditis elegans. Cubic and star-shaped AgNPs induced cytotoxicity, while quasi-spherical AgNPs were not toxic. Quasi-spherical AgNPs showed substantial antibiofilm activity in vitro with 96% (±2%), 97% (±1%), and 98% (±1%) biofilm killing of SA, MRSA, and PA, respectively, while significantly reducing mortality of infected nematodes. The in vivo antibiofilm activity was linked to the accumulation of AgNPs in the intestinal tract of C. elegans as observed by 3D X-ray tomography. Quasi-spherical AgNPs were physically stable in suspension for over 6 months with no observed loss in antibiofilm activity. While toxicity and stability limited the utilization of cubic and star-shaped AgNPs, quasi-spherical AgNPs could be rapidly synthesized, were stable and nontoxic, and showed substantial in vitro and in vivo activity against clinically relevant biofilms. Quasi-spherical AgNPs hold potential as pharmacotherapy, for example, as topical treatment for biofilm-related infections.
Keywords: MRSA
Pseudomonas aeruginosa
Staphylococcus aureus
Rights: © 2017 American Chemical Society
DOI: 10.1021/acsami.7b03672
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