Parastoo Sharifian,1 Somayeh Yaslianifard,2 Parviz Fallah,3 Siavash Aynesazi,4 Mahmood Bakhtiyari,5 Mohammad Mohammadzadeh2

1Department of Microbiology, School of Medicine, Alborz University of Medical Sciences, Karaj, Iran; 2Department of Microbiology, School of Medicine, Dietary Supplements and Probiotic Research Center, Alborz University of Medical Sciences, Karaj, Iran; 3Department of Laboratory Science, Faculty of Allied Medicine, Alborz University of Medical Sciences, Karaj, Iran; 4Department of Microbiology, Faculty of Science, North Branch, Islamic Azad, Tehran, Iran; 5Department of Community Medicine and Epidemiology, School of Medicine, Non-Communicable Diseases Research Center, Alborz University of Medical Sciences, Karaj, Iran

Correspondence: Mohammad Mohammadzadeh Tel +989126767995Email M.mohammadzadeh84@yahoo.com

Background: Pseudomonas aeruginosa is an opportunistic pathogen that causes serious nosocomial infections, especially in immunodeficient patients and cystic fibrosis, cancer, and burned individuals. The biofilm that plays an important role in the virulence of P. aeruginosa is under the regulation of quorum sensing and two-component regulatory systems of bacteria. Curcumin, an active phenolic extract of turmeric has shown an inhibitory effect on the biofilm formation of some pathogenic bacteria. Thus, the present study aims to evaluate the effect of Nano-Curcumin on the expression of major regulatory genes involved in biofilm formation of P. aeruginosa.Materials and Methods: The biofilm formation of P. aeruginosa ATCC 10145 was assessed in the presence of 15, 20, and 25 g/mL concentrations of Nano-Curcumin using the microplate titer method. The effect of Nano-Curcumin on the expression level of regulatory genes were determined by relative reverse transcriptase-realtime PCR.Results: In the absence of Nano-Curcumin, P. aeruginosa strain ATCC 10145 strongly produced biofilm (3+) and in the presence of 15 and 20 g/mL, biofilm formation was reduced to moderate (2+) and weak biofilm producer (1+), respectively. Nano-Curcumin at a concentration of 25g/mL inhibited biofilm formation in P. aeruginosa. The expression of regulatory genes was not affected by biofilm inhibitory concentrations of Nano-Curcumin.Conclusion: The antibiofilm mechanism of Curcumin is not related to the downregulation of regulatory systems of P. aeruginosa and probably it prevents the formation of a complete biofilm structure.

Keywords: Pseudomonas aeruginosa, biofilm formation, Nano-Curcumin

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Investigating the Effect of Nano-Curcumin on the Expression of Biofilm | IDR - Dove Medical Press