Negin Bahmanpoor - Department of Biology, Central Tehran Branch, Islamic Azad University, Tehran, Iran
Seyed Mohammad Mahdi Hamdi - Department of Microbiology, School of Medicine and Applied Microbiology Research Center, Institute of Toxicology and Systems Biology, Baqiyatullah University of Medical Sciences, Tehran, Iran
RamezanAli Ataee - Department of Microbiology, School of Medicine and Clinical Research Development Committee, Baqiyatullah University of Medical Sciences, Tehran, Iran

Background and Aim: Pseudomonas aeruginosa exotoxins are responsible for pathogenicity and antibiotic resistant. The aim of this study was to investigate the effects of the Ammi. visnaga (A. visnaga) extract on the P. aeruginosa exotoxin A and S genes expression. Materials and Methods: Antibacterial effects of the A. visnaga ethanolic extract were performed using the micro dilution technique in sequential dilutions. Then, the Real-Time- RT PCR method was used to analyze the level of expression of the exotoxin A and S genes of the bacterium. Real-Time PCR data were analyzed using Graph Pad Software Inc. San Diego (GRAPHPAD PRISM ۶CA, USA). Results: Results showed that, the expression of Exotoxin A and S genes was significantly (P <۰.۰۰۱) reduced in comparing the expression level of the reference gene and control. It had a significant effect on the inhibition of bacterial growth at different concentrations but the lowest inhibitory concentration was observed at ۳.۱۲۵ µg/well. Conclusion: Accordingly, the extract of A. visnaga can decrease the expression of the Exotoxin A and S genes of P. aeruginosa and consequently it may decrease the pathogenicity of bacteria. These phenomena (exoA and exoS expression inhibition) may involve reducing the antibiotic resistance of P. aeruginosa.

Antibacterial, Gene Expression, Ammi. visnaga, Exotoxins, Pseudomonas aeruginosa, ضد باکتریایی, بیان ژن, Ammi. visnaga, اگزوتوکسین, سودوموناس آئروژینوزا