WITHDRAWN: Copper Nanoparticles on expression of LuxS of the genes in Pseudomonas aeruginosa strains anti-Biofilm formation

Abstract

The resistance to broad spectrum antimicrobials therapy such Pseudomonas aeruginosa, . Biofilms are major virulence factors to resist antibiotics; in this concern the need for providing new alternatives for antibiotics is becoming an urgent requirement,Now day therapies and applications based treatments felid nanoparticle. copper Oxide nanoparticles, were produced from MDR and strong biofilm producer P. aeruginosa isolate by biological method, against P. aeruginosa colonization of the biofilm and LuxSgene expression.This study was aimed to explore whether green synthesized copper nanoparticles (CuNPs) can function as an anti-biofilm agent of P. aeruginosa bacteria. The nanoparticles was synthesized from cell free extract of P. aeruginosa. Characterization of biosynthesized copper nanoparticles was carried out to determine the chemical and physical properties of the product usinging AFM, TEM ,XRD and UV visible spectrometry. The hexagonal structure was confirmed by XRD, size range was marked 13-19nm by TEM, was used to confirm the surface morphology. AFM analysis used to reveal the roughness and distribution of nanoparticles. UV–visible spectra of the synthesized nanoparticles recorded maximum peak at 300 nm. Copper nanoparticles showed remarkable biofilm inhibitory on multidrug resistant at (32 μg/ml) sub Minimum Inhibitory Concentration (MIC), CuNPs exhibited remarkable effect against P. aeruginosa .Strong biofilm producer strains were incubated with 1ml of sub MIC of CuNPs for 24 -48 hrs at 37C . The current study has proven that copper oxide nanoparticles possess the ability to act as anti-biofilm agents against P. aeruginosa. This was evidenced by their significant downregulation of LuxS gene expression, The results indicated a major down-regulation in LuxS expression after exposure to CuNPs, suggesting the antimicrobial agent against multidrug-resistant P. aeruginosa infections.