The Inhibitory Effects of Lactobacillus Agilis Against Pseudomonas Aeruginosa Biofilm Formation and Evaluation  of PpyR (PA2663) and algD Gene Expression

Yasaman  Issazadeh; Mohadeseh  Farnaghizad; Sarvenaz  Falsafi; Hoora  Mazaheri; Shokoofeh  Ghazi; Ava  Behrouzi

doi:10.18502/ijml.v10i1.12422

Yasaman Issazadeh Department of Microbiology, Faculty of Advanced Science and Technology, Tehran Medical Science, Islamic Azad University, Tehran, Iran
Mohadeseh Farnaghizad Department of Microbiology, Faculty of Advanced Science and Technology, Tehran Medical Science, Islamic Azad University, Tehran, Iran
Sarvenaz Falsafi Department of Molecular Biology, Pasteur Institute of Iran, Tehran, Iran
Hoora Mazaheri Department of Microbiology, Faculty of Advanced Science and Technology, Tehran Medical Science, Islamic Azad University, Tehran, Iran
Shokoofeh Ghazi Department of Microbiology, Faculty of Advanced Science and Technology, Tehran Medical Science, Islamic Azad University, Tehran, Iran
Ava Behrouzi Department of Microbiology, Faculty of Advanced Science and Technology, Tehran Medical Science, Islamic Azad University, Tehran, Iran

DOI: https://doi.org/10.18502/ijml.v10i1.12422

Keywords: algD, Biofilm, Gene expression, PpyR, Pseudomonas aeruginosa

Abstract

Background and Aims: Hospital infections and their antibiotic resistance have become a global concern recently. One of the most prominent factors in hospital infections is Pseudomonas aeruginosa (P. aeruginosa), which can become resistant to many antibiotics due to its ability to form biofilms. Recently, scientists have tried to replace antibiotic therapy with alternative therapies such as probiotics which can reduce or eliminate the pathogenic bacteria's ability to form biofilms. Therefore, the present study revealed that some genes, such as algD
and PpyR, were involved in biofilm formation in P. aeruginosa. Furthermore, the inhibitory effect of the supernatant of lactobacillus agilis on the biofilm formation of P. aeruginosa was evaluated in the current study.

Materials and Methods: In this study, the effect of the supernatant of probiotic Lactobacillus agilis on the biofilm formation of P. aeruginosa and also the expression of two genes effective in biofilm formation (algD and PpyR) were investigated. Antibiograms were performed to detect the most resistant bacteria since there is a link between biofilm formation and antibiotic resistance. Further, the effects of probiotics on the expression of PpyR and algD genes were discussed.

Results: Results showed that the biofilm formation of P. aeruginosa was significantly reduced in the presence of lactobacillus agilis.

Conclusions: According to the current study, it could be concluded that because of antibiotics resistance and their associated mechanisms, probiotics could be used as a replacement for antibiotics in many treatments.