Abstract
Pseudomonas aeruginosa biofilm-related infections are the major cause of premature death in cystic fibrosis patients. Strategies to induce biofilm dispersal are of interest, because of their potential in preventing biofilm-related infections. Our previous work demonstrated that n-butanolic Cyclamen coum extract with ciprofloxacin could eliminate 1- and 3-day-old P. aeruginosa PAO1 biofilms. To gain new insights into the role of C. coum extract and its synergistic effect with ciprofloxacin in eliminating P. aeruginosa PAO1 biofilms, two-dimensional gel electrophoresis (2-DE) in combination with mass spectrometry-based protein identification were used. Changes in the bacterial protein expression were analyzed when 3-day-old biofilm cells were exposed to the C. coum extract alone and in combination with ciprofloxacin. Proteins involved in alginate biosynthesis, quorum sensing, adaptation/protection, carbohydrate and amino acid metabolism showed a weaker expression in the C. coum extract-ciprofloxacin-treated biofilm cells compared to those in the untreated cells. Interestingly, the proteome of C. coum extract-ciprofloxacin-treated biofilm revealed more resemblance to the planktonic phenotype than to the biofilm phenotype. It appears that saponin extract in combination with ciprofloxacin causes biofilm disruption due to several mechanisms such as motility induction, cell envelope integrity perturbation, stress protein expression reduction, and more importantly, signal transduction perturbation. In conclusion, exposure to a combination of biofilm dispersal such as saponin extract and antimicrobial agents may offer a novel strategy to control preestablished, persistent P. aeruginosa biofilms and biofilm-related infections.
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Abbreviations
- 2-DE:
-
Two-dimensional gel electrophoresis
- TSA:
-
Tryptic soy agar
- TSB:
-
Trypticase soy broth
- IPG:
-
Immobilized pH gradient
- PMSF:
-
Ammonium persulfate and phenylmethylsulfonylfluoride
- THU:
-
Tehran Herbarium University
- DMSO:
-
Dimethyl-sulphoxide
- FBECs:
-
Fractional biofilm eliminating concentration
- MBEC:
-
Minimum biofilm eliminating concentration
- BSA:
-
Bovine serum albumin
- ACN:
-
Acetonitrile
- CAM:
-
Carbamidomethyl
- Me:
-
Methionine
- FA:
-
Formic acid
- SD:
-
Standard deviations
- Fgt:
-
Flagellar glycosyl transferase
- Ndk:
-
Nucleoside diphosphate kinase
- AHL:
-
Acyl-homoserine lactone
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Acknowledgments
The corresponding author would like to thank the National Institute of Genetic Engineering and Biotechnology (NIGEB) and the Vice Chancellor of the Alzahra University for financial support.
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Shafiei, M., Abdi-Ali, A., Shahcheraghi, F. et al. Analysis of Pseudomonas aeruginosa PAO1 Biofilm Protein Profile After Exposure to n-Butanolic Cyclamen coum Extract Alone and in Combination with Ciprofloxacin. Appl Biochem Biotechnol 182, 1444–1457 (2017). https://doi.org/10.1007/s12010-017-2409-4
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DOI: https://doi.org/10.1007/s12010-017-2409-4