Coating of silicone with mannoside-PAMAM dendrimers to enhance formation of non-pathogenic Escherichia coli biofilms against colonization of uropathogens
| Autor: | Zhiling Zhu, Lijuan Zhang, Rabih O. Darouiche, Fei Yu, Richard A. Hull, Yuyu Long, Quan Chen, Siheng Li, Jun Wang, Haoqing Chen, Chengzhi Cai, Analette I. Lopez |
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| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Dendrimers Mannosides Materials science 030106 microbiology Silicones Biomedical Engineering 010402 general chemistry medicine.disease_cause 01 natural sciences Biochemistry Microbiology Biomaterials 03 medical and health sciences chemistry.chemical_compound Silicone Coated Materials Biocompatible Pathogenic Escherichia coli Dendrimer Escherichia coli medicine Molecular Biology biology Biofilm General Medicine biology.organism_classification 0104 chemical sciences Bacterial adhesin chemistry Biofilms Bacteria Biotechnology |
| Zdroj: | Acta Biomaterialia. 64:200-210 |
| ISSN: | 1742-7061 |
| Popis: | Bacterial interference using non-pathogenic Escherichia coli 83972 is a novel strategy for preventing catheter-associated urinary tract infection (CAUTI). Crucial to the success of this strategy is to establish a high coverage and stable biofilm of the non-pathogenic bacteria on the catheter surface. However, this non-pathogenic strain is sluggish to form biofilms on silicone as the most widely used material for urinary catheters. We have addressed this issue by modifying the silicone catheter surfaces with mannosides that promote the biofilm formation, but the stability of the non-pathogenic biofilms challenged by uropathogens over long-term remains a concern. Herein, we report our study on the stability of the non-pathogenic biofilms grown on propynylphenyl mannoside-modified silicone. The result shows that 94% non-pathogenic bacteria were retained on the modified silicone under >0.5 Pa shear stress. After being challenged by three multidrug-resistant uropathogenic isolates in artificial urine for 11 days, large amounts (>4 × 10 6 CFU cm −2 ) of the non-pathogenic bacteria remained on the surfaces. These non-pathogenic biofilms reduced the colonization of the uropathogens by >3.2-log. Statement of Significance In bacterial interference, the non-pathogenic Escherichia coli strains are sluggish to form biofilms on the catheter surfaces, due to rapid removal by urine flow. We have demonstrated a solution to this bottleneck by pre-functionalization of mannosides on the silicone surfaces to promote E. coli biofilm formation. A pre-conjugated high affinity propynylphenyl mannoside ligand tethered to the nanometric amino-terminated poly(amido amine) (PAMAM) dendrimer is used for binding to a major E. coli adhesin FimH. It greatly improves the efficiency for the catheter modification, the non-pathogenic biofilm coverage, as well as the (long-term) stability for prevention of uropathogen infections. |
| Databáze: | OpenAIRE |
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