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Efficacy of silk fibroin–nano silver against Staphylococcus aureus biofilms in a rabbit model of sinusitis

Authors Jia M, Chen Z, Guo Y, Chen X, Zhao X

Received 13 December 2016

Accepted for publication 20 March 2017

Published 10 April 2017 Volume 2017:12 Pages 2933—2939


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 4

Editor who approved publication: Dr Lei Yang

Minghui Jia,1,2 Zhongchun Chen,2 Yongwei Guo,2 Xin Chen,3 Xia Zhao2

1Department of Otolaryngology-Head and Neck Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 2Department of Otolaryngology-Head and Neck Surgery, Huashan Hospital, Fudan University, 3State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Laboratory of Advanced Materials, Fudan University, Shanghai, China

Background: Staphylococcus aureus biofilms contribute significantly to the recalcitrant nature of chronic rhinosinusitis. In previous studies, it has been shown that silk fibroin–nano silver solution can eliminate S. aureus biofilms in vitro, which suggests a potential role of this novel agent in the treatment of biofilm-associated diseases, such as sinusitis.
Objective: The aim of this study was to investigate the efficacy of silk fibroin–nano silver solution as a topical anti-biofilm agent in a rabbit model of sinusitis.
Methods: Biofilm-associated sinusitis models were established in 24 New Zealand White rabbits by gelatin sponge placement and S. aureus inoculation through a hole drilled into the anterolateral wall of the right maxillary sinus. After 4 weeks, indwelling catheters were placed into the maxillary sinus. Different concentrations of silk fibroin–nano silver solution or normal saline were irrigated slowly into the maxillary sinus via the indwelling catheters. After 7 days of irrigation, the rabbits were sacrificed. The sinus mucosa was harvested and examined for biofilm biomass as well as morphological integrity of the epithelium by scanning electron microscopy.
Results: Silk fibroin–nano silver solution was found to be most effective in reducing the biomass of the S. aureus biofilms at a concentration of 384 mg/L, followed by the concentration of 153.6 mg/L, when compared with saline. After treatment with 384 mg/L silk fibroin–nano silver solution, the biofilms were completely eliminated and the injured epithelium was almost restored with regenerated cilia on the surface.
Conclusion: Silk fibroin–nano silver solution was found to be an effective topical agent against S. aureus biofilms in the rabbit model of sinusitis, and its effect was concentration-dependent.

Keywords: chronic rhinosinusitis, nasal irrigation, maxillary sinus, biomass, scanning electron microscopy, animal

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