Zahra Ghorbani - Molecular Microbiology Research Center (MMRC), Faculty of Medicine, Shahed University, Tehran, Iran
Parviz Owlia - Molecular Microbiology Research Center (MMRC), Faculty of Medicine, Shahed University, Tehran, Iran
Mahmood Amin Marashi - Molecular Microbiology Research Center (MMRC), Faculty of Medicine, Shahed University, Tehran, Iran
Horieh Saderi - Molecular Microbiology Research Center (MMRC), Faculty of Medicine, Shahed University, Tehran, Iran

Background and Aims: Pseudomonas aeruginosa is a potent pathogen for humans using multiple virulence factors. The purpose of this study was to investigate the effect of Saccharomyces cerevisiae lysates and supernatants on biofilm, alginate factors. Materials and Methods: First, the supernatant extract and lysate were prepared from the native strain of Saccharomyces cerevisiae and turned into dry powder. Then, supernatant and lysate extracts were admixed with Pseudomonas aeruginosa strain PAO۱ and strain M ۸۸۲۱, respectively, and biofilm in the strain PAO۱ and alginate in strain ۸۸۲۱ M by Colorimetric method is measured by reading Optical Density(OD) also mention to the wave length. Supernatant with MIC concentration of ۱/۲ in both experiments and all concentrations of lysates in biofilm test and the highest concentration of lysates in alginate test were used. Results: Supernatant of Saccharomyces cerevisiae at a concentration of ۱ / ۲MIC (۰.۵۱۲ mg / ml) with P <۰.۰۵ significantly reduced the production of alginate in Pseudomonas aeruginosa ۸۸۲۱ M  strain, but did not affect biofilm in  Pseudomonas aeruginosa PAO۱ strain respectively, with all concentrations and the highest concentration (۸.۱۹۲ mg / ml) with P <۰.۰۵ significantly reduced the production of biofilms in Pseudomonas aeruginosa strain PAO۱ and alginate in Pseudomonas aeruginosa ۸۸۲۱ M strain. Conclusion: Saccharomyces cerevisiae is one of the options that probiotic studies can examine its effects on virulence pathogens, but requires the ultimate goal of producing probiotic drugs.

Pseudomonas aeruginosa, Saccharomyces cerevisiae, alginate, biofilm, سودوموناس آئروژینوزا, ساکارومایسس سرویزیه, آلژینات, بیوفیلم, مهار