Antibiofilm effect of green engineered silver nanoparticles fabricated from Artemisia scoporia extract on the expression of icaA and icaR genes against multidrug-resistant Staphylococcus aureus.

Silver nanoparticles (AgNPs) are at the forefront of the swiftly developing scope of nanotechnology. In the current study, we investigated the green synthesis of AgNPs using Artemisia scoporia as a reducing and capping agent. The biosynthesized AgNPs were characterized using ultraviolet-visible spectroscopy, X-ray diffraction, Fourier-Transform infrared spectroscopy, dispersive absorption spectroscopy, scanning electron microscopy, and transmission electron microscopy. The efficacy of the nanoparticle synthesis was assessed by comparing the antibiofilm activity with commercial AgNPs. The effect of sub-minimum inhibitory concentrations (MICs) of AgNPs on biofilm formation was determined by microtiter plate assay. The expression level of the icaA and icaR genes was assessed by real-time polymerase chain reaction assay. The structural and functional aspects of AgNPs were confirmed. The expression levels of icaA and icaR in the isolates exposed to sub-MIC of both commercial and biosynthetic AgNPs were lower and higher than in the control group, respectively. Our results also indicated that greater reduction and induction in icaA and icaR gene expression were noticed with the sub-MIC doses of biosynthetic AgNP versus commercial AgNP, respectively. This study suggested the application of AgNPs as a significant therapeutic and clinical option in the future and usage for fabricating medical implants. Nevertheless, further investigation is required for examining the pharmaceutical and medicinal properties of AgNPs.
(© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)