E. coli and S. aureus resist silver nanoparticles via an identical mechanism, but through different pathways
Abstract Nanostructured materials with antibacterial activity face the same threat as conventional antibiotics - bacterial resistance, which reduces their effectiveness. However, unlike antibiotics, research into the emergence and mechanisms of bacterial resistance to antibacterial nanomaterials is...
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| Format: | Article |
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Nature Portfolio
2024-11-01
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| Series: | Communications Biology |
| Online Access: | https://doi.org/10.1038/s42003-024-07266-3 |
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| author | Lucie Hochvaldová David Panáček Lucie Válková Renata Večeřová Milan Kolář Robert Prucek Libor Kvítek Aleš Panáček |
| author_facet | Lucie Hochvaldová David Panáček Lucie Válková Renata Večeřová Milan Kolář Robert Prucek Libor Kvítek Aleš Panáček |
| author_sort | Lucie Hochvaldová |
| collection | DOAJ |
| description | Abstract Nanostructured materials with antibacterial activity face the same threat as conventional antibiotics - bacterial resistance, which reduces their effectiveness. However, unlike antibiotics, research into the emergence and mechanisms of bacterial resistance to antibacterial nanomaterials is still in its early stages. Here we show how Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli bacteria develop resistance to silver nanoparticles, resulting in an increase in the minimum inhibitory concentration from 1.69 mg/L for S. aureus and 3.38 mg/L for E. coli to 54 mg/L with repeated exposure over 12 and 6 cultivation steps, respectively. The mechanism of resistance is the same for both types of bacteria and involves the aggregation of silver nanoparticles leading to the formation of black precipitates. However, the way in which Gram-positive and Gram-negative bacteria induce aggregation of silver nanoparticles is completely different. Chemical analysis of the surface of the silver precipitates shows that aggregation is triggered by flagellin production in E. coli and by bacterial biofilm formation in S. aureus. However, resistance in both types of bacteria can be overcome by using pomegranate rind extract, which inhibits both flagellin and biofilm production, or by stabilizing the silver nanoparticles by covalently binding them to a composite material containing graphene sheets, which protects the silver nanoparticles from aggregation induced by the bacterial biofilm produced by S. aureus. This research improves the understanding of bacterial resistance mechanisms to nanostructured materials, which differ from resistance mechanisms to conventional antibiotics, and provides potential strategies to combat bacterial resistance and develop more effective antimicrobial treatments. |
| format | Article |
| id | doaj-art-bc1284b9eeb44b248396ec87b6f10a84 |
| institution | Kabale University |
| issn | 2399-3642 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Communications Biology |
| spelling | doaj-art-bc1284b9eeb44b248396ec87b6f10a842024-11-24T12:38:59ZengNature PortfolioCommunications Biology2399-36422024-11-017111010.1038/s42003-024-07266-3E. coli and S. aureus resist silver nanoparticles via an identical mechanism, but through different pathwaysLucie Hochvaldová0David Panáček1Lucie Válková2Renata Večeřová3Milan Kolář4Robert Prucek5Libor Kvítek6Aleš Panáček7Department of Physical Chemistry, Faculty of Science, Palacký University in Olomouc, 17. listopadu 12Department of Physical Chemistry, Faculty of Science, Palacký University in Olomouc, 17. listopadu 12Department of Physical Chemistry, Faculty of Science, Palacký University in Olomouc, 17. listopadu 12Department of Microbiology, Faculty of Medicine and Dentistry, Palacký University in Olomouc, Hněvotínská 3Department of Microbiology, Faculty of Medicine and Dentistry, Palacký University in Olomouc, Hněvotínská 3Department of Physical Chemistry, Faculty of Science, Palacký University in Olomouc, 17. listopadu 12Department of Physical Chemistry, Faculty of Science, Palacký University in Olomouc, 17. listopadu 12Department of Physical Chemistry, Faculty of Science, Palacký University in Olomouc, 17. listopadu 12Abstract Nanostructured materials with antibacterial activity face the same threat as conventional antibiotics - bacterial resistance, which reduces their effectiveness. However, unlike antibiotics, research into the emergence and mechanisms of bacterial resistance to antibacterial nanomaterials is still in its early stages. Here we show how Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli bacteria develop resistance to silver nanoparticles, resulting in an increase in the minimum inhibitory concentration from 1.69 mg/L for S. aureus and 3.38 mg/L for E. coli to 54 mg/L with repeated exposure over 12 and 6 cultivation steps, respectively. The mechanism of resistance is the same for both types of bacteria and involves the aggregation of silver nanoparticles leading to the formation of black precipitates. However, the way in which Gram-positive and Gram-negative bacteria induce aggregation of silver nanoparticles is completely different. Chemical analysis of the surface of the silver precipitates shows that aggregation is triggered by flagellin production in E. coli and by bacterial biofilm formation in S. aureus. However, resistance in both types of bacteria can be overcome by using pomegranate rind extract, which inhibits both flagellin and biofilm production, or by stabilizing the silver nanoparticles by covalently binding them to a composite material containing graphene sheets, which protects the silver nanoparticles from aggregation induced by the bacterial biofilm produced by S. aureus. This research improves the understanding of bacterial resistance mechanisms to nanostructured materials, which differ from resistance mechanisms to conventional antibiotics, and provides potential strategies to combat bacterial resistance and develop more effective antimicrobial treatments.https://doi.org/10.1038/s42003-024-07266-3 |
| spellingShingle | Lucie Hochvaldová David Panáček Lucie Válková Renata Večeřová Milan Kolář Robert Prucek Libor Kvítek Aleš Panáček E. coli and S. aureus resist silver nanoparticles via an identical mechanism, but through different pathways Communications Biology |
| title | E. coli and S. aureus resist silver nanoparticles via an identical mechanism, but through different pathways |
| title_full | E. coli and S. aureus resist silver nanoparticles via an identical mechanism, but through different pathways |
| title_fullStr | E. coli and S. aureus resist silver nanoparticles via an identical mechanism, but through different pathways |
| title_full_unstemmed | E. coli and S. aureus resist silver nanoparticles via an identical mechanism, but through different pathways |
| title_short | E. coli and S. aureus resist silver nanoparticles via an identical mechanism, but through different pathways |
| title_sort | e coli and s aureus resist silver nanoparticles via an identical mechanism but through different pathways |
| url | https://doi.org/10.1038/s42003-024-07266-3 |
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