Enhancement of antibiotics antimicrobial activity due to the silver nanoparticles impact on the cell membrane


Autoři: R. Vazquez-Muñoz aff001;  A. Meza-Villezcas aff001;  P. G. J. Fournier aff002;  E. Soria-Castro aff003;  K. Juarez-Moreno aff001;  A. L. Gallego-Hernández aff004;  N. Bogdanchikova aff001;  R. Vazquez-Duhalt aff001;  A. Huerta-Saquero aff001
Působiště autorů: Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Ensenada, Baja California, México aff001;  Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Baja California, México aff002;  Instituto Nacional de Cardiología Ignacio Chávez, Ciudad de México, México aff003;  Departamento de Investigación en Física, Universidad de Sonora, Hermosillo, Sonora, México aff004
Vyšlo v časopise: PLoS ONE 14(11)
Kategorie: Research Article
doi: 10.1371/journal.pone.0224904

Souhrn

The ability of microorganisms to generate resistance outcompetes with the generation of new and efficient antibiotics; therefore, it is critical to develop novel antibiotic agents and treatments to control bacterial infections. An alternative to this worldwide problem is the use of nanomaterials with antimicrobial properties. Silver nanoparticles (AgNPs) have been extensively studied due to their antimicrobial effect in different organisms. In this work, the synergistic antimicrobial effect of AgNPs and conventional antibiotics was assessed in Gram-positive and Gram-negative bacteria. AgNPs minimal inhibitory concentration was 10–12 μg mL-1 in all bacterial strains tested, regardless of their different susceptibility against antibiotics. Interestingly, a synergistic antimicrobial effect was observed when combining AgNPs and kanamycin according to the fractional inhibitory concentration index, FICI: <0.5), an additive effect by combining AgNPs and chloramphenicol (FICI: 0.5 to 1), whereas no effect was found with AgNPs and β-lactam antibiotics combinations. Flow cytometry and TEM analysis showed that sublethal concentrations of AgNPs (6–7 μg mL-1) altered the bacterial membrane potential and caused ultrastructural damage, increasing the cell membrane permeability. No chemical interactions between AgNPs and antibiotics were detected. We propose an experimental supported mechanism of action by which combinatorial effect of antimicrobials drives synergy depending on their specific target, facilitated by membrane alterations generated by AgNPs. Our results provide a deeper understanding about the synergistic mechanism of AgNPs and antibiotics, aiming to combat antimicrobial infections efficiently, especially those by multi-drug resistant microorganisms, in order to mitigate the current crisis due to antibiotic resistance.

Klíčová slova:

Antibiotics – Antimicrobials – Bacillus subtilis – Cell membranes – Permeability – Salmonella typhimurium – Staphylococcus aureus – Transmission electron microscopy


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2019 Číslo 11