Brominated Furanones Inhibit Biofilm Formation by Salmonella enterica Serovar Typhimurium

• DOI: 10.1128/aem.01262-08
• Publication Date: 2008-09-13T00:44:55Z
• Authors: Joost C. A. Janssens; Hans Steenackers; Stijn Robijns; Edith Gellens; Jeremy Levin; Hui Zhao; Kim Hermans; David De Coster; Tine L. Verhoeven; Kathleen Marchal; Jos Vanderleyden; Dirk E. De Vos; Sigrid C. J. De K...
• Keywords: Salmonella typhimurium; 0301 basic medicine; SERRATIA-LIQUEFACIENS MG1; TO-CELL COMMUNICATION; Microbial Sensitivity Tests; HALOGENATED FURANONES; BACILLUS-SUBTILIS; 03 medical and health sciences; Furans; QUORUM-SENSING SIGNAL; Oligonucleotide Array Sequence Analysis; DIFFERENTIAL GENE-EXPRESSION; ALGA DELISEA-PULCHRA; SWARMING MOTILITY; Microbial Viability; Molecular Structure; Gene Expression Profiling; VIBRIO-HARVEYI; Biology and Life Sciences; Gene Expression Regulation, Bacterial; Anti-Bacterial Agents; 3. Good health; ESCHERICHIA-COLI; Flagella; Biofilms; Locomotion

ABSTRACT

Salmonella enterica serovar Typhimurium is a main cause of bacterial food-borne diseases. As Salmonella can form biofilms in which it is better protected against antimicrobial agents on a wide diversity of surfaces, it is of interest to explore ways to inhibit biofilm formation. Brominated furanones, originally extracted from the marine alga Delisea pulchra , are known to interfere with biofilm formation in several pathogens. In this study, we have synthesized a small focused library of brominated furanones and tested their activity against S. enterica serovar Typhimurium biofilm formation. We show that several furanones inhibit Salmonella biofilm formation at non-growth-inhibiting concentrations. The most interesting compounds are ( Z )-4-bromo-5-(bromomethylene)-3-alkyl-2( 5H )-furanones with chain lengths of two to six carbon atoms. A microarray study was performed to analyze the gene expression profiles of Salmonella in the presence of ( Z )-4-bromo-5-(bromomethylene)-3-ethyl-2( 5H )-furanone. The induced genes include genes that are involved in metabolism, stress response, and drug sensitivity. Most of the repressed genes are involved in metabolism, the type III secretion system, and flagellar biosynthesis. Follow-up experiments confirmed that this furanone interferes with the synthesis of flagella by Salmonella . No evidence was found that furanones act on the currently known quorum-sensing systems in Salmonella . Interestingly, pretreatment with furanones rendered Salmonella biofilms more susceptible to antibiotic treatment. Conclusively, this work demonstrates that particular brominated furanones have potential in the prevention of biofilm formation by Salmonella serovar Typhimurium.